/* ============================================
   PHILOSOPHY PAGE - DARK AEROSPACE THEME
   Floating bottle, dynamic cards, immersive feel
   ============================================ */

/* Import main space styles */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --bg-black: #000000;
  --bg-dark: #0a0a0a;
  --bg-card: #111111;
  --bg-card-hover: #1a1a1a;
  --white: #ffffff;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --accent-blue: #60a5fa;
  --accent-purple: #a78bfa;
  --accent-pink: #f472b6;
  --glow-blue: rgba(96, 165, 250, 0.4);
  --glow-purple: rgba(167, 139, 250, 0.4);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-main);
  background: var(--bg-black);
  color: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  opacity: 0.8;
}

a:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 4px;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px clamp(20px, 5vw, 80px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(180deg, rgba(0,0,0,0.9) 0%, transparent 100%);
  transition: background 0.3s ease;
}

.navbar.scrolled {
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(20px);
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--gray-300);
}

.nav-links a:hover {
  color: var(--white);
  opacity: 1;
}

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

/* ============================================
   HERO - FLOATING BOTTLE SECTION
   ============================================ */
.hero-bottle {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120px 20px 80px;
  overflow: hidden;
  background: var(--bg-black);
}

/* Ambient glow effects */
.hero-bottle::before {
  content: '';
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--glow-purple) 0%, transparent 70%);
  opacity: 0.3;
  pointer-events: none;
  animation: pulseGlow 4s ease-in-out infinite;
}

.hero-bottle::after {
  content: '';
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--glow-blue) 0%, transparent 70%);
  opacity: 0.2;
  pointer-events: none;
  animation: pulseGlow 4s ease-in-out infinite 1s;
}

@keyframes pulseGlow {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
  50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.4; }
}

/* Floating bottle container */
.bottle-container {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
}

.bottle-wrapper {
  position: relative;
  animation: floatBottle 4s ease-in-out infinite;
}

@keyframes floatBottle {
  0%, 100% {
    transform: translateY(0) rotate(-15deg);
  }
  50% {
    transform: translateY(-30px) rotate(-12deg);
  }
}

.bottle-image {
  width: clamp(200px, 40vw, 400px);
  height: auto;
  filter: drop-shadow(0 0 60px var(--glow-purple)) drop-shadow(0 0 120px var(--glow-blue));
  transition: all 0.5s ease;
}

.bottle-container:hover .bottle-image {
  filter: drop-shadow(0 0 80px var(--glow-purple)) drop-shadow(0 0 150px var(--glow-blue));
  transform: scale(1.05);
}

/* Click instruction */
.click-instruction {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  animation: fadeInUp 1s ease 0.5s forwards;
  opacity: 0;
}

.click-text {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gray-400);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

.click-arrow {
  width: 24px;
  height: 24px;
  border-left: 2px solid var(--gray-400);
  border-bottom: 2px solid var(--gray-400);
  transform: rotate(-45deg);
  animation: bounceArrow 1.5s ease-in-out infinite;
}

@keyframes bounceArrow {
  0%, 100% { transform: rotate(-45deg) translateY(0); }
  50% { transform: rotate(-45deg) translateY(8px); }
}

/* Submission textbox */
.submission-box {
  margin-top: 32px;
  padding: 20px 40px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  text-align: center;
  backdrop-filter: blur(10px);
  animation: fadeInUp 1s ease 0.8s forwards;
  opacity: 0;
  transition: all 0.3s ease;
}

.submission-box:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 40px rgba(167, 139, 250, 0.2);
}

.submission-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 8px;
}

.submission-title {
  font-size: clamp(16px, 3vw, 20px);
  font-weight: 600;
  color: var(--white);
  letter-spacing: 0.02em;
}

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

/* Scroll indicator */
.scroll-down {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--gray-500);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  animation: fadeInUp 1s ease 1.2s forwards;
  opacity: 0;
}

.scroll-down::after {
  content: '';
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--gray-500), transparent);
}

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-intro {
  text-align: center;
  padding: clamp(80px, 12vh, 160px) 20px;
  max-width: 900px;
  margin: 0 auto;
}

.section-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 24px;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--white) 0%, var(--gray-300) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--gray-400);
  line-height: 1.8;
  max-width: 700px;
  margin: 0 auto;
}

/* ============================================
   TOPICS GRID - ENHANCED
   ============================================ */
.topics-section {
  padding: 0 clamp(20px, 5vw, 80px) clamp(80px, 12vh, 160px);
  position: relative;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  max-width: 1400px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .topics-grid {
    grid-template-columns: 1fr;
  }
}

/* Topic Card - Enhanced */
.topic-card {
  position: relative;
  padding: 32px;
  background: linear-gradient(135deg, rgba(17, 17, 17, 0.9) 0%, rgba(10, 10, 10, 0.95) 100%);
  border: 1px solid var(--gray-800);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-pink));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.topic-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(167, 139, 250, 0.1) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.topic-card:hover {
  transform: translateY(-8px);
  border-color: var(--gray-700);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.4),
    0 0 80px rgba(167, 139, 250, 0.1);
}

.topic-card:hover::before {
  transform: scaleX(1);
}

.topic-card:hover::after {
  opacity: 1;
}

/* Card header with number */
.topic-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.topic-number {
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--gray-700) 0%, var(--gray-800) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: all 0.4s ease;
}

.topic-card:hover .topic-number {
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.topic-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--gray-800);
  color: var(--gray-400);
  transition: all 0.4s ease;
}

.topic-card:hover .topic-icon {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  color: var(--white);
}

.topic-icon svg {
  width: 20px;
  height: 20px;
}

/* Card content */
.topic-title {
  font-size: clamp(18px, 2.5vw, 22px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--white);
  margin-bottom: 12px;
  transition: color 0.3s ease;
}

.topic-card:hover .topic-title {
  color: var(--gray-100);
}

.topic-description {
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray-400);
  margin-bottom: 24px;
}

/* Card footer */
.topic-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--gray-800);
}

.topic-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-500);
  padding: 6px 12px;
  background: var(--gray-900);
  border-radius: 4px;
}

.topic-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--gray-400);
  transition: all 0.3s ease;
}

.topic-link:hover {
  color: var(--white);
  gap: 12px;
  opacity: 1;
}

.topic-link::after {
  content: '→';
  transition: transform 0.3s ease;
}

.topic-card:hover .topic-link::after {
  transform: translateX(4px);
}

/* ============================================
   QUOTE / INTERLUDE SECTION
   ============================================ */
.quote-section {
  padding: clamp(100px, 15vh, 200px) 20px;
  text-align: center;
  position: relative;
  background: var(--bg-dark);
  border-top: 1px solid var(--gray-800);
  border-bottom: 1px solid var(--gray-800);
}

.quote-section::before {
  content: '"';
  position: absolute;
  top: 40px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 200px;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1;
  pointer-events: none;
}

.quote-text {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 300;
  line-height: 1.5;
  color: var(--gray-200);
  max-width: 900px;
  margin: 0 auto 24px;
  position: relative;
  z-index: 1;
}

.quote-author {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray-500);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: 60px clamp(20px, 5vw, 80px);
  border-top: 1px solid var(--gray-800);
  text-align: center;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer-text {
  font-size: 12px;
  color: var(--gray-500);
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-500);
}

.footer-nav a:hover {
  color: var(--white);
  opacity: 1;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 32px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  transition: all 0.3s ease;
}

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

.btn-primary:hover {
  background: transparent;
  color: var(--white);
  opacity: 1;
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: var(--gray-600);
}

.btn-outline:hover {
  border-color: var(--white);
  opacity: 1;
}

/* ============================================
   PARTICLE BACKGROUND
   ============================================ */
.particles {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--gray-600);
  border-radius: 50%;
  animation: floatParticle 20s infinite linear;
}

@keyframes floatParticle {
  0% {
    transform: translateY(100vh) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-100vh) translateX(100px);
    opacity: 0;
  }
}

/* Generate particles */
.particle:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 25s; }
.particle:nth-child(2) { left: 20%; animation-delay: 2s; animation-duration: 20s; }
.particle:nth-child(3) { left: 30%; animation-delay: 4s; animation-duration: 28s; }
.particle:nth-child(4) { left: 40%; animation-delay: 1s; animation-duration: 22s; }
.particle:nth-child(5) { left: 50%; animation-delay: 3s; animation-duration: 26s; }
.particle:nth-child(6) { left: 60%; animation-delay: 5s; animation-duration: 24s; }
.particle:nth-child(7) { left: 70%; animation-delay: 2.5s; animation-duration: 21s; }
.particle:nth-child(8) { left: 80%; animation-delay: 4.5s; animation-duration: 27s; }
.particle:nth-child(9) { left: 90%; animation-delay: 1.5s; animation-duration: 23s; }
.particle:nth-child(10) { left: 5%; animation-delay: 3.5s; animation-duration: 29s; }

/* ============================================
   LOADING ANIMATION
   ============================================ */
.loading {
  opacity: 0;
}

.loaded {
  opacity: 1;
  transition: opacity 0.8s ease;
}

/* ============================================
   CUSTOM SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-black);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-700);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-600);
}