/* ============================================
   PHILOSOPHY DIMENSION - DARK MINIMAL AESTHETIC
   ============================================ */

/* CSS Custom Properties */
:root {
  /* Colors - Dark Minimal Palette */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-card: #141414;
  
  --color-text-primary: #ffffff;
  --color-text-secondary: #a0a0a0;
  --color-text-tertiary: #666666;
  --color-text-muted: #444444;
  
  --color-accent: #c9a962;
  --color-accent-hover: #d4b978;
  --color-accent-dim: rgba(201, 169, 98, 0.1);
  
  --color-border: #2a2a2a;
  --color-border-light: #333333;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;
  --text-8xl: 6rem;
  --text-9xl: 8rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --space-40: 10rem;
  --space-48: 12rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-slower: 700ms ease;
  
  /* Z-Index Scale */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  --z-toast: 800;
}

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

html {
  font-size: 16px;
  scroll-behavior: auto; /* Lenis handles this */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html.lenis, html.lenis body {
  height: auto;
}

.lenis.lenis-smooth {
  scroll-behavior: auto !important;
}

.lenis.lenis-smooth [data-lenis-prevent] {
  overscroll-behavior: contain;
}

.lenis.lenis-stopped {
  overflow: hidden;
}

.lenis.lenis-smooth iframe {
  pointer-events: none;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--text-6xl); }
h2 { font-size: var(--text-5xl); }
h3 { font-size: var(--text-4xl); }
h4 { font-size: var(--text-3xl); }
h5 { font-size: var(--text-2xl); }
h6 { font-size: var(--text-xl); }

p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

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

/* Selection */
::selection {
  background-color: var(--color-accent-dim);
  color: var(--color-accent);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-light);
}

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */

.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: 900px;
}

.container-wide {
  max-width: 1600px;
}

.section {
  position: relative;
  padding: var(--space-32) 0;
}

.section-sm {
  padding: var(--space-16) 0;
}

.section-lg {
  padding: var(--space-48) 0;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  padding: var(--space-4) 0;
  transition: background-color var(--transition-base), 
              backdrop-filter var(--transition-base),
              padding var(--transition-base);
}

.nav--scrolled {
  background-color: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(20px);
  padding: var(--space-3) 0;
}

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

.nav__logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

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

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  position: relative;
  padding: var(--space-2) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text-primary);
}

/* Mobile Menu Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 1px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-20) 0;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: var(--z-base);
}

.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 0%, var(--color-bg-primary) 70%);
  z-index: 1;
}

.hero__gradient {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse at 20% 80%, rgba(201, 169, 98, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(201, 169, 98, 0.05) 0%, transparent 50%);
}

.hero__content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 900px;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-size: clamp(var(--text-5xl), 10vw, var(--text-8xl));
  line-height: 1;
  margin-bottom: var(--space-8);
}

.hero__title .line {
  display: block;
  overflow: hidden;
}

.hero__title .line-inner {
  display: block;
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-10);
  line-height: 1.7;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  border: 1px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-primary);
  transition: all var(--transition-base);
}

.hero__cta:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-dim);
  color: var(--color-accent);
}

.hero__cta svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-base);
}

.hero__cta:hover svg {
  transform: translateX(4px);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-10);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.scroll-indicator__line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  transform-origin: top;
}

/* ============================================
   TEXT SPLIT REVEAL
   ============================================ */

.split-text .char,
.split-text .word {
  display: inline-block;
  will-change: transform, opacity;
}

.split-text .line {
  overflow: hidden;
  display: block;
}

.split-text .line-inner {
  display: block;
  transform: translateY(100%);
  opacity: 0;
}

.split-text.revealed .line-inner {
  transform: translateY(0);
  opacity: 1;
}

/* ============================================
   CONCEPT CARDS
   ============================================ */

.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-6);
}

.concept-card {
  position: relative;
  padding: var(--space-8);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-base), 
              transform var(--transition-base);
  overflow: hidden;
}

.concept-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-accent-dim) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.concept-card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-4px);
}

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

.concept-card__number {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.concept-card__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.concept-card__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.concept-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

.concept-card__link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-base);
}

.concept-card:hover .concept-card__link svg {
  transform: translateX(4px);
}

/* ============================================
   THINKER CARDS
   ============================================ */

.thinkers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.thinker-card {
  position: relative;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  overflow: hidden;
  cursor: pointer;
  transition: border-color var(--transition-base);
}

.thinker-card:hover {
  border-color: var(--color-border-light);
}

.thinker-card__image {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
}

.thinker-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%);
  transition: filter var(--transition-slow), transform var(--transition-slow);
}

.thinker-card:hover .thinker-card__image img {
  filter: grayscale(0%);
  transform: scale(1.05);
}

.thinker-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--color-bg-primary) 0%, transparent 60%);
}

.thinker-card__content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-6);
  transform: translateY(20px);
  transition: transform var(--transition-base);
}

.thinker-card:hover .thinker-card__content {
  transform: translateY(0);
}

.thinker-card__name {
  font-size: var(--text-xl);
  margin-bottom: var(--space-1);
}

.thinker-card__school {
  font-size: var(--text-sm);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.thinker-card__bio {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-3);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.thinker-card:hover .thinker-card__bio {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   QUOTE SECTION
   ============================================ */

.quote-section {
  padding: var(--space-32) 0;
}

.quote-container {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.quote__mark {
  font-family: var(--font-display);
  font-size: 8rem;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.3;
  margin-bottom: var(--space-4);
}

.quote__text {
  font-family: var(--font-display);
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  line-height: 1.4;
  color: var(--color-text-primary);
  margin-bottom: var(--space-8);
}

.quote__author {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
}

.quote__author::before {
  content: '— ';
  color: var(--color-accent);
}

/* Quote Carousel */
.quote-carousel {
  position: relative;
}

.quote-carousel__item {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
}

.quote-carousel__item.active {
  position: relative;
  opacity: 1;
  visibility: visible;
}

.quote-carousel__nav {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-10);
}

.quote-carousel__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-border);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.quote-carousel__dot:hover,
.quote-carousel__dot.active {
  background-color: var(--color-accent);
  transform: scale(1.2);
}

/* ============================================
   CONTENT SECTIONS
   ============================================ */

.content-section {
  padding: var(--space-24) 0;
}

.section-header {
  margin-bottom: var(--space-16);
}

.section-header__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.section-header__title {
  font-size: clamp(var(--text-4xl), 6vw, var(--text-6xl));
  max-width: 800px;
}

.section-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-top: var(--space-4);
}

/* Content Block */
.content-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.content-block__image {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
}

.content-block__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.content-block__text h3 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-6);
}

.content-block__text p {
  margin-bottom: var(--space-4);
}

.content-block__text p:last-child {
  margin-bottom: 0;
}

/* ============================================
   TIMELINE
   ============================================ */

.timeline {
  position: relative;
  padding-left: var(--space-12);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-12);
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: calc(var(--space-12) * -1 - 3px);
  top: var(--space-2);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.timeline__date {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.timeline__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.timeline__description {
  color: var(--color-text-secondary);
}

/* ============================================
   KEY CONCEPTS LIST
   ============================================ */

.key-concepts {
  display: grid;
  gap: var(--space-4);
}

.key-concept {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-base);
}

.key-concept:hover {
  border-color: var(--color-border-light);
}

.key-concept__icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-dim);
  color: var(--color-accent);
  flex-shrink: 0;
}

.key-concept__content h4 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}

.key-concept__content p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ============================================
   QUOTES ARCHIVE
   ============================================ */

.quotes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: var(--space-6);
}

.quote-card {
  padding: var(--space-8);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-base);
}

.quote-card:hover {
  border-color: var(--color-border-light);
}

.quote-card__text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
}

.quote-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.quote-card__author {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

.quote-card__source {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.quote-card__source::before {
  content: '•';
  margin-right: var(--space-3);
  color: var(--color-accent);
}

/* ============================================
   CONTACT FORM
   ============================================ */

.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-4);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  transition: border-color var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-4) var(--space-8);
  background-color: var(--color-accent);
  border: none;
  color: var(--color-bg-primary);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: background-color var(--transition-base);
}

.form-button:hover {
  background-color: var(--color-accent-hover);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  padding: var(--space-16) 0;
  border-top: 1px solid var(--color-border);
}

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

.footer__logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
}

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

.footer__links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

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

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

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

/* Reveal Animation States */
.reveal {
  opacity: 0;
  transform: translateY(24px);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Fade Animation States */
.fade-in {
  opacity: 0;
}

.fade-in.active {
  opacity: 1;
}

/* Slide Animations */
.slide-up {
  opacity: 0;
  transform: translateY(40px);
}

.slide-up.active {
  opacity: 1;
  transform: translateY(0);
}

.slide-left {
  opacity: 0;
  transform: translateX(40px);
}

.slide-left.active {
  opacity: 1;
  transform: translateX(0);
}

/* Scale Animation */
.scale-in {
  opacity: 0;
  transform: scale(0.95);
}

.scale-in.active {
  opacity: 1;
  transform: scale(1);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  
  .content-block {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .nav__links {
    display: none;
  }
  
  .nav__toggle {
    display: flex;
  }
}

@media (max-width: 768px) {
  :root {
    --space-32: 6rem;
    --space-24: 4rem;
    --space-16: 3rem;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .concepts-grid,
  .thinkers-grid,
  .quotes-grid {
    grid-template-columns: 1fr;
  }
  
  .section-header__title {
    font-size: var(--text-3xl);
  }
  
  .footer__inner {
    flex-direction: column;
    gap: var(--space-6);
    text-align: center;
  }
  
  .timeline {
    padding-left: var(--space-8);
  }
}

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