/* ============================================
   VELQO — Design Tokens
   ============================================ */
:root {
  --primary: #1C1F24;
  --secondary: #DADDE3;
  --background: #F7F8FA;
  --text: #121417;
  --accent: #8FA3B8;

  --font-heading: 'Libre Franklin', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-body: 'Inter', 'IBM Plex Sans', system-ui, sans-serif;

  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-silence: cubic-bezier(0.25, 0.1, 0.25, 1);
  --duration-slow: 1.2s;
  --duration-medium: 0.8s;
  --duration-fast: 0.4s;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  --space-2xl: 12rem;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--background);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.2;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

/* ============================================
   Reveal Animation System
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity var(--duration-slow) var(--ease-silence),
    transform var(--duration-slow) var(--ease-silence);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Header — Vertical Line + Radial Menu
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  height: 100vh;
  pointer-events: none;
}

.header-trigger {
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 100vh;
  pointer-events: auto;
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: 0;
}

.header-line {
  display: block;
  width: 1px;
  height: 100%;
  background-color: var(--accent);
  opacity: 0.6;
  transition: opacity var(--duration-fast) var(--ease-soft);
}

.header-trigger:hover .header-line,
.header-trigger[aria-expanded="true"] .header-line {
  opacity: 1;
}

.radial-menu {
  position: fixed;
  top: 50%;
  left: 24px;
  transform: translateY(-50%);
  pointer-events: none;
}

.radial-menu.is-open {
  pointer-events: auto;
}

.radial-menu__list {
  list-style: none;
  position: relative;
}

.radial-menu__link {
  position: absolute;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.9);
  transition:
    opacity var(--duration-medium) var(--ease-silence),
    transform var(--duration-medium) var(--ease-silence);
  white-space: nowrap;
  padding: var(--space-xs) var(--space-sm);
}

.radial-menu.is-open .radial-menu__link {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.radial-menu__link:hover,
.radial-menu__link:focus-visible {
  color: var(--accent);
  outline: none;
}

/* ============================================
   Sections — Shared
   ============================================ */
.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg) var(--space-md);
  padding-left: calc(var(--space-md) + 48px);
  position: relative;
}

.section__heading {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 300;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

/* ============================================
   Section 1 — The Empty Canvas
   ============================================ */
.section--canvas {
  flex-direction: column;
  gap: var(--space-xl);
}

.canvas__line {
  width: min(60vw, 400px);
  height: 1px;
  background-color: var(--secondary);
  transition: width var(--duration-slow) var(--ease-silence);
}

.section--canvas.is-scrolled .canvas__line {
  width: min(80vw, 600px);
  background-color: var(--accent);
}

.canvas__emerge {
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-silence);
}

.section--canvas.is-scrolled .canvas__emerge {
  opacity: 1;
}

.canvas__text {
  font-family: var(--font-heading);
  font-size: clamp(0.875rem, 2vw, 1.125rem);
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  text-align: center;
}

/* ============================================
   Section 2 — The Structure Grid
   ============================================ */
.section--grid {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.grid-container {
  position: relative;
  width: 100%;
  max-width: 900px;
  aspect-ratio: 3 / 2;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--secondary) 1px, transparent 1px),
    linear-gradient(90deg, var(--secondary) 1px, transparent 1px);
  background-size: calc(100% / 5) calc(100% / 4);
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-silence);
}

.section--grid.is-visible .grid-overlay {
  opacity: 0.35;
}

.grid-nodes {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 0;
}

.node {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: default;
  padding: var(--space-sm);
}

.node::before {
  content: '';
  position: absolute;
  width: 6px;
  height: 6px;
  background-color: var(--accent);
  border-radius: 50%;
  opacity: 0.4;
  transition:
    transform var(--duration-medium) var(--ease-soft),
    opacity var(--duration-medium) var(--ease-soft);
}

.node:hover::before,
.node:focus-within::before {
  transform: scale(2);
  opacity: 1;
}

.node__label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text);
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity var(--duration-fast) var(--ease-soft),
    transform var(--duration-fast) var(--ease-soft);
}

.node:hover .node__label,
.node:focus-within .node__label {
  opacity: 1;
  transform: translateY(0);
}

.node__detail {
  position: absolute;
  top: calc(50% + 1.5rem);
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  color: var(--accent);
  text-align: center;
  max-width: 180px;
  opacity: 0;
  transition: opacity var(--duration-medium) var(--ease-silence);
  pointer-events: none;
}

.node:hover .node__detail,
.node:focus-within .node__detail {
  opacity: 1;
}

/* ============================================
   Section 3 — The Idea Flow
   ============================================ */
.section--flow {
  min-height: 80vh;
}

.flow-container {
  position: relative;
  height: 120px;
  width: 100%;
  max-width: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flow-statement {
  position: absolute;
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 3vw, 1.5rem);
  font-weight: 300;
  letter-spacing: 0.05em;
  text-align: center;
  color: var(--text);
  opacity: 0;
  transition: opacity 1.5s var(--ease-silence);
}

.flow-statement.is-active {
  opacity: 1;
}

.flow-statement.is-fading {
  opacity: 0;
}

/* ============================================
   Section 4 — The Module Space
   ============================================ */
.section--modules {
  min-height: auto;
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.modules-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  width: 100%;
  max-width: 600px;
}

.module {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--secondary);
  transition: padding var(--duration-medium) var(--ease-soft);
}

.module:last-child {
  border-bottom: 1px solid var(--secondary);
}

.module:hover,
.module:focus-within {
  padding: var(--space-lg) 0;
}

.module__title {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: var(--space-xs);
}

.module__def {
  font-size: 0.9375rem;
  color: var(--accent);
  margin-bottom: 0;
}

.module__expand {
  font-size: 0.875rem;
  color: var(--text);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  margin-top: 0;
  transition:
    opacity var(--duration-medium) var(--ease-silence),
    max-height var(--duration-medium) var(--ease-silence),
    margin-top var(--duration-medium) var(--ease-silence);
}

.module:hover .module__expand,
.module:focus-within .module__expand {
  opacity: 0.7;
  max-height: 3rem;
  margin-top: var(--space-sm);
}

/* ============================================
   Section 5 — The Balance Field
   ============================================ */
.balance-field {
  position: relative;
  width: 100%;
  max-width: 700px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.balance-element {
  position: absolute;
  background-color: var(--secondary);
  transition: transform 3s var(--ease-silence);
}

.balance-element--left {
  width: 80px;
  height: 80px;
  left: 15%;
  top: 50%;
  transform: translateY(-50%);
}

.balance-element--center {
  width: 40px;
  height: 40px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background-color: var(--accent);
  opacity: 0.5;
}

.balance-element--right {
  width: 60px;
  height: 60px;
  right: 15%;
  top: 50%;
  transform: translateY(-50%);
}

.balance-field.is-balanced .balance-element--left {
  transform: translateY(-50%) translateX(30px);
}

.balance-field.is-balanced .balance-element--right {
  transform: translateY(-50%) translateX(-20px);
}

.balance-caption {
  position: absolute;
  bottom: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-align: center;
  width: 100%;
}

/* ============================================
   Section 6 — The Thinking Room
   ============================================ */
.section--thinking {
  background-color: var(--primary);
  color: var(--secondary);
  min-height: 100vh;
}

.thinking-room {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: 500px;
  width: 100%;
}

.thought-fragment {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--secondary);
  opacity: 0.4;
  cursor: pointer;
  transition:
    opacity var(--duration-medium) var(--ease-silence),
    transform var(--duration-medium) var(--ease-silence);
  outline: none;
  padding: var(--space-xs) 0;
}

.thought-fragment:hover,
.thought-fragment:focus-visible {
  opacity: 0.7;
}

.thought-fragment.is-complete {
  opacity: 1;
}

/* ============================================
   Section 7 — The Reduction Wall
   ============================================ */
.reduction-wall {
  width: 100%;
  max-width: 800px;
  text-align: center;
}

.reduction-hint {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.reduction-stage {
  margin-bottom: var(--space-md);
}

.reduction-svg {
  width: 100%;
  height: auto;
}

.reduction-line {
  stroke: var(--accent);
  stroke-width: 1;
  opacity: 0.6;
  transition:
    opacity var(--duration-slow) var(--ease-silence),
    stroke-width var(--duration-slow) var(--ease-silence);
}

.reduction-point {
  fill: var(--accent);
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-silence);
}

.reduction-layer.is-active .reduction-line {
  opacity: 1;
}

.reduction-layer.is-active .reduction-point {
  opacity: 0.8;
}

.reduction-layer--lines.is-dissolving .reduction-line {
  opacity: 0;
  stroke-width: 0;
}

.reduction-layer--points.is-dissolving .reduction-point {
  opacity: 0;
  transform: scale(0);
}

.reduction-point--final {
  opacity: 0;
}

.reduction-layer--empty.is-active .reduction-point--final {
  opacity: 0.4;
}

.reduction-btn {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--secondary);
  transition:
    border-color var(--duration-fast) var(--ease-soft),
    color var(--duration-fast) var(--ease-soft);
}

.reduction-btn:hover,
.reduction-btn:focus-visible {
  border-color: var(--accent);
  color: var(--text);
  outline: none;
}

/* ============================================
   Section 8 — The Clarity Timeline
   ============================================ */
.timeline {
  position: relative;
  max-width: 400px;
  width: 100%;
  padding-left: var(--space-lg);
}

.timeline__line {
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 1px;
  background-color: var(--secondary);
}

.timeline__entry {
  position: relative;
  padding-bottom: var(--space-lg);
}

.timeline__entry:last-child {
  padding-bottom: 0;
}

.timeline__point {
  position: absolute;
  left: calc(-1 * var(--space-lg) + 3px);
  top: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent);
  opacity: 0.5;
  transition: opacity var(--duration-fast) var(--ease-soft);
}

.timeline__entry:hover .timeline__point,
.timeline__entry:focus-within .timeline__point {
  opacity: 1;
}

.timeline__year {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: var(--space-xs);
}

.timeline__text {
  font-size: 0.9375rem;
  font-weight: 300;
  color: var(--text);
  line-height: 1.5;
}

/* ============================================
   Section 9 — The Silence Zone
   ============================================ */
.section--silence {
  min-height: 70vh;
  padding: 0;
}

.silence-zone {
  width: 100%;
  height: 70vh;
  position: relative;
  overflow: hidden;
}

.silence-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ============================================
   Section 10 — The Final Statement
   ============================================ */
.section--final {
  min-height: 100vh;
}

.final-field {
  text-align: center;
  max-width: 700px;
}

.final-statement {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  font-weight: 300;
  letter-spacing: 0.04em;
  line-height: 1.4;
  color: var(--primary);
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 2s var(--ease-silence),
    transform 2s var(--ease-silence);
  margin-bottom: var(--space-lg);
}

.final-field.is-visible .final-statement {
  opacity: 1;
  transform: translateY(0);
}

.final-btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text);
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--secondary);
  opacity: 0;
  transition:
    opacity 1.5s var(--ease-silence) 0.8s,
    border-color var(--duration-fast) var(--ease-soft),
    color var(--duration-fast) var(--ease-soft);
}

.final-field.is-visible .final-btn {
  opacity: 1;
}

.final-btn:hover,
.final-btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

/* ============================================
   Contact
   ============================================ */
.section--contact {
  min-height: 50vh;
  flex-direction: column;
  align-items: flex-start;
  padding-bottom: var(--space-2xl);
}

.contact-text {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 300;
}

.contact-link {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-fast) var(--ease-soft);
}

.contact-link:hover,
.contact-link:focus-visible {
  border-bottom-color: var(--accent);
  outline: none;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  padding: var(--space-md) var(--space-md) var(--space-md) calc(var(--space-md) + 48px);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  opacity: 0.6;
}

/* ============================================
   Responsive — Mobile First
   ============================================ */
@media (max-width: 768px) {
  .section {
    padding: var(--space-md) var(--space-sm);
    padding-left: calc(var(--space-sm) + 40px);
  }

  .header-trigger {
    width: 40px;
  }

  .radial-menu {
    left: 20px;
  }

  .radial-menu__link {
    font-size: 0.75rem;
  }

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

  .balance-element--left {
    left: 10%;
    width: 50px;
    height: 50px;
  }

  .balance-element--right {
    right: 10%;
    width: 40px;
    height: 40px;
  }

  .site-footer {
    padding-left: calc(var(--space-sm) + 40px);
  }
}

@media (max-width: 480px) {
  .grid-container {
    aspect-ratio: 1;
  }

  .grid-nodes {
    grid-template-columns: 1fr 1fr;
  }

  .node__detail {
    max-width: 140px;
    font-size: 0.6875rem;
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
  }

  .flow-statement {
    opacity: 1;
    position: static;
  }

  .flow-container {
    height: auto;
    flex-direction: column;
    gap: var(--space-md);
  }

  .final-statement,
  .final-btn {
    opacity: 1;
    transform: none;
  }
}