/* kekvonal.css - page layer for the Kék Vonal case study.
   Concept: the "blue line". It starts tangled in the hero (the process nobody
   designed), straightens, and then runs down every chapter as a rail that
   fills as you scroll. All motion is scroll-driven CSS behind @supports and
   prefers-reduced-motion: with neither, every element is simply visible. */

/* ---- page base --------------------------------------------------------- */

.kv-page {
  font-family: var(--font-primary);
  color: var(--color-dark);
  background-color: var(--color-white);
  overflow-x: clip;
}

.kv-text {
  margin: 0;
  max-width: 62ch;
  font-size: var(--font-size-body-md);
  line-height: 1.6;
}

.kv-text-lg {
  margin: 0;
  max-width: 52ch;
  font-size: var(--font-size-body-lg);
  line-height: 1.55;
}

/* ---- hero -------------------------------------------------------------- */

.kv-hero {
  position: relative;
  padding-top: var(--space-atf-top);
  padding-bottom: var(--space-7);
  background-color: var(--color-dark);
  color: var(--color-white);
  overflow: hidden;
}

.kv-hero-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-5);
}

.kv-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding: var(--space-2) var(--space-4);
  border: 1px solid color-mix(in srgb, var(--color-white) 20%, transparent);
  border-radius: var(--radius-pill);
  font-size: var(--font-size-body-md);
  color: var(--color-pale);
}

.kv-eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background-color: var(--color-green);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-green) 25%, transparent);
}

.kv-hero-title {
  margin: 0;
  max-width: 16ch;
  font-size: var(--font-size-headline);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.03em;
}

.kv-hero-number {
  display: block;
  color: var(--color-green);
}

.kv-hero-lead {
  margin: 0;
  max-width: 46ch;
  font-size: var(--font-size-body-lg);
  line-height: 1.55;
  color: color-mix(in srgb, var(--color-white) 78%, transparent);
}

.kv-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.kv-hero-tag {
  padding: 6px var(--space-4);
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-blue) 28%, transparent);
  color: var(--color-pale);
  font-size: var(--font-size-body-md);
}

.kv-hero-line {
  position: relative;
  margin-top: var(--space-7);
  height: 220px;
}

.kv-hero-line-svg {
  width: 100%;
  height: 100%;
}

.kv-hero-line-path {
  stroke: var(--color-blue);
  stroke-width: 4;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  filter: drop-shadow(0 0 10px var(--color-blue));
}

.kv-hero-line-pulse {
  position: absolute;
  right: var(--space-6);
  top: 50%;
  width: 14px;
  height: 14px;
  margin-top: -7px;
  border-radius: var(--radius-pill);
  background-color: var(--color-green);
}

.kv-hero-legend {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--font-size-body-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-slate);
}

.kv-hero-legend-after {
  color: var(--color-green);
  text-align: right;
}

/* ---- chapters: the rail ------------------------------------------------ */

.kv-chapter {
  padding-block: var(--space-10);
  scroll-margin-top: calc(var(--header-h) + var(--space-4));
}

.kv-chapter--dark {
  background-color: var(--color-dark);
  color: var(--color-white);
}

.kv-chapter--blue {
  background-color: var(--color-blue);
  color: var(--color-white);
}

.kv-chapter-inner {
  display: flex;
  gap: var(--space-7);
}

.kv-chapter-rail {
  position: relative;
  flex: 0 0 72px;
  border-left: 2px solid color-mix(in srgb, currentColor 15%, transparent);
}

/* the line that fills as the chapter scrolls past */
.kv-chapter-rail::after {
  content: "";
  position: absolute;
  top: 0;
  left: -2px;
  width: 2px;
  height: 100%;
  background-color: var(--color-blue);
  transform-origin: top;
}

.kv-chapter--dark .kv-chapter-rail::after,
.kv-chapter--blue .kv-chapter-rail::after {
  background-color: var(--color-green);
}

.kv-chapter-num {
  position: sticky;
  top: calc(var(--header-h) + var(--space-5));
  display: block;
  padding-left: var(--space-4);
  font-size: var(--font-size-h5);
  font-weight: 500;
  color: var(--color-blue);
}

.kv-chapter--dark .kv-chapter-num,
.kv-chapter--blue .kv-chapter-num {
  color: var(--color-green);
}

.kv-chapter-num::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 50%;
  width: 16px;
  height: 16px;
  margin-top: -8px;
  border-radius: var(--radius-pill);
  background-color: currentColor;
  box-shadow: 0 0 0 6px color-mix(in srgb, currentColor 22%, transparent);
}

.kv-chapter-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: var(--space-6);
  min-width: 0;
}

.kv-chapter-title {
  margin: 0;
  font-size: var(--font-size-h2);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

/* ---- 01 facts ---------------------------------------------------------- */

.kv-facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.kv-fact {
  display: flex;
  flex: 1 1 200px;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5);
  border-radius: var(--radius-large);
  background-color: var(--color-surface);
}

.kv-fact-value {
  font-size: var(--font-size-h3);
  font-weight: 500;
  line-height: 1;
  color: var(--color-blue);
}

.kv-fact-label {
  font-size: var(--font-size-body-md);
  color: var(--color-dark-muted);
}

.kv-callout {
  margin: 0;
  max-width: 40ch;
  font-size: var(--font-size-h5);
  line-height: 1.3;
}

.kv-callout-strong {
  font-weight: 600;
  color: var(--color-blue);
}

/* ---- 02 the tangle ----------------------------------------------------- */

.kv-tangle {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: 0;
  padding: var(--space-5) 0;
  list-style: none;
  counter-reset: kv-step;
}

.kv-tangle-step {
  --kv-tilt: -4deg;
  --kv-shift: 6px;
  counter-increment: kv-step;
  padding: var(--space-3) var(--space-4);
  border: 1px dashed color-mix(in srgb, var(--color-white) 35%, transparent);
  border-radius: var(--radius-medium);
  font-size: var(--font-size-body-lg);
  transform: rotate(var(--kv-tilt)) translateY(var(--kv-shift));
}

.kv-tangle-step::before {
  content: counter(kv-step, decimal-leading-zero) " ";
  color: var(--color-green);
}

.kv-tangle-step:nth-child(2) { --kv-tilt: 5deg; --kv-shift: -10px; }
.kv-tangle-step:nth-child(3) { --kv-tilt: -2deg; --kv-shift: 12px; }
.kv-tangle-step:nth-child(4) { --kv-tilt: 7deg; --kv-shift: -4px; }
.kv-tangle-step:nth-child(5) { --kv-tilt: -6deg; --kv-shift: 8px; }
.kv-tangle-step:nth-child(6) { --kv-tilt: 3deg; --kv-shift: -12px; }

.kv-questions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.kv-questions-label {
  margin: 0;
  font-size: var(--font-size-body-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-slate);
}

.kv-questions-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.kv-question {
  font-size: var(--font-size-h5);
  line-height: 1.3;
  color: var(--color-pale);
}

.kv-question::before {
  content: "? ";
  color: var(--color-green);
  font-weight: 600;
}

.kv-finding {
  margin: 0;
  max-width: 100%;
  font-size: var(--font-size-h4);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.kv-finding-em {
  font-style: normal;
  color: var(--color-green);
}

/* ---- quote ------------------------------------------------------------- */

.kv-quote {
  padding-block: var(--space-10);
  background-color: var(--color-blue);
  color: var(--color-white);
}

.kv-quote-block,
.kv-sky-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin: 0;
}

.kv-quote-text,
.kv-sky-text {
  margin: 0;
  max-width: 100%;
  font-size: var(--font-size-h3);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.kv-quote-cite {
  font-size: var(--font-size-body-lg);
  font-weight: 600;
}

.kv-quote-role {
  display: block;
  font-weight: 400;
  opacity: 0.75;
}

/* ---- 03 split ---------------------------------------------------------- */

.kv-split {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.kv-split-card {
  display: flex;
  flex: 1 1 260px;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  border-radius: var(--radius-large);
}

.kv-split-card--machine {
  background-color: var(--color-dark);
  color: var(--color-white);
}

.kv-split-card--human {
  background-color: var(--color-green);
  color: var(--color-dark);
}

.kv-split-label {
  margin: 0;
  font-size: var(--font-size-body-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
}

.kv-split-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.kv-split-item {
  font-size: var(--font-size-h5);
  line-height: 1.3;
}

.kv-split-card--machine .kv-split-item::before {
  content: "⟶ ";
  color: var(--color-green);
}

.kv-split-card--human .kv-split-item::before {
  content: "● ";
  color: var(--color-blue);
}

.kv-note {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin: 0;
  max-width: 70ch;
  padding: var(--space-5);
  border-left: 3px solid var(--color-blue);
  border-radius: 0 var(--radius-medium) var(--radius-medium) 0;
  background-color: var(--color-surface);
}

.kv-note-icon {
  flex: 0 0 24px;
  color: var(--color-blue);
}

.kv-note-text {
  font-size: var(--font-size-body-md);
  line-height: 1.6;
}

/* ---- 04 stats ---------------------------------------------------------- */

.kv-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.kv-stat {
  display: flex;
  flex: 1 1 240px;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
  min-height: 220px;
  padding: var(--space-6);
  border: 1px solid color-mix(in srgb, var(--color-white) 30%, transparent);
  border-radius: var(--radius-large);
  border-width: 4px;
}

.kv-stat-value {
  font-size: var(--font-size-h1);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-dark);
}

.kv-stat-value--strike {
  color: var(--color-dark);
  text-decoration: line-through;
  text-decoration-color: var(--color-green);
  text-decoration-thickness: 4px;
}

.kv-stat-label {
  font-size: var(--font-size-body-lg);
  line-height: 1.4;
  font-weight: 300;
  color: var(--color-dark);
}

/* ---- 05 hours: 130 dots, one per hour ---------------------------------- */

.kv-hours {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-7);
}

.kv-hours-grid {
  --kv-cell: 28px;
  position: relative;
  flex: 0 0 auto;
  width: calc(var(--kv-cell) * 13);
  height: calc(var(--kv-cell) * 10);
  background-image: radial-gradient(circle, var(--color-dark-muted) 0 7px, transparent 8px);
  background-size: var(--kv-cell) var(--kv-cell);
}

.kv-hours-fill {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--color-green) 0 7px, transparent 8px);
  background-size: var(--kv-cell) var(--kv-cell);
}

.kv-hours-copy {
  display: flex;
  flex: 1 1 320px;
  flex-direction: column;
  gap: var(--space-5);
}

.kv-hours-caption {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  font-size: var(--font-size-body-md);
  color: var(--color-slate);
}

.kv-hours-swatch {
  width: 14px;
  height: 14px;
  border-radius: var(--radius-pill);
}

.kv-hours-swatch--admin {
  background-color: var(--color-dark-muted);
}

.kv-hours-swatch--care {
  background-color: var(--color-green);
}

/* ---- sky quote --------------------------------------------------------- */

.kv-sky {
  padding-block: calc(var(--space-10) * 1.5);
  background-color: var(--color-dark);
  background-image:
    radial-gradient(circle at 12% 22%, var(--color-white) 0 1px, transparent 2px),
    radial-gradient(circle at 78% 14%, var(--color-pale) 0 1.5px, transparent 2.5px),
    radial-gradient(circle at 64% 70%, var(--color-white) 0 1px, transparent 2px),
    radial-gradient(circle at 30% 82%, var(--color-green) 0 1.5px, transparent 2.5px),
    radial-gradient(circle at 90% 56%, var(--color-white) 0 1px, transparent 2px),
    radial-gradient(ellipse at 50% 120%, color-mix(in srgb, var(--color-blue) 55%, transparent), transparent 60%);
  background-size: 180px 180px, 240px 240px, 210px 210px, 300px 300px, 160px 160px, 100% 100%;
  color: var(--color-white);
}

.kv-sky-block {
  margin-inline: auto;
  padding: 0;
  border: 0;
  text-align: center;
  align-items: center;
}

.kv-sky-highlight {
  color: var(--color-green);
}

.kv-quote-cite--light .kv-quote-role {
  color: var(--color-pale);
}

/* ---- CTA --------------------------------------------------------------- */

.kv-cta {
  padding-block: var(--space-10);
  background-color: var(--color-blue);
}

.kv-cta-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-5);
}

.kv-cta-title {
  margin: 0;
  font-size: var(--font-size-headline);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
}

.kv-cta-text {
  margin: 0;
  max-width: 44ch;
  font-size: var(--font-size-body-lg);
  line-height: 1.55;
}

.kv-cta-button {
  height: 48px;
}

.kv-cta-button .label-part {
  background-color: var(--color-dark);
}

.kv-cta-button .button-label {
  color: var(--color-white);
}

.kv-cta-button .icon-part {
  width: 48px;
  height: 48px;
}

.kv-cta-button:focus-visible {
  outline: 3px solid var(--color-blue);
  outline-offset: 4px;
  border-radius: var(--radius-pill);
}

/* ---- motion (scroll-driven, progressive) -------------------------------- */

@keyframes kv-draw {
  from { stroke-dasharray: 1; stroke-dashoffset: 1; }
  to { stroke-dasharray: 1; stroke-dashoffset: 0; }
}

@keyframes kv-pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--color-green) 60%, transparent); }
  50% { box-shadow: 0 0 0 14px transparent; }
}

@keyframes kv-rise {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: none; }
}

@keyframes kv-fill-rail {
  from { transform: scaleY(0); }
  to { transform: scaleY(1); }
}

@keyframes kv-untangle {
  to { transform: none; border-style: solid; border-color: var(--color-green); }
}

@keyframes kv-hours-flip {
  from { clip-path: inset(0 0 100% 0); }
  to { clip-path: inset(0 0 0 0); }
}

@media (prefers-reduced-motion: no-preference) {
  .kv-hero-line-path {
    animation: kv-draw 2.4s cubic-bezier(0.6, 0, 0.2, 1) both;
  }

  .kv-hero-line-pulse {
    animation: kv-pulse 2s ease-out 2.4s infinite;
  }

  @supports (animation-timeline: view()) {
    .kv-reveal {
      animation: kv-rise linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 45%;
    }

    .kv-chapter-rail::after {
      animation: kv-fill-rail linear both;
      animation-timeline: view();
      animation-range: entry 20% exit 60%;
    }

    .kv-tangle-step {
      animation: kv-untangle linear both;
      animation-timeline: view();
      animation-range: cover 25% cover 55%;
    }

    .kv-hours-fill {
      animation: kv-hours-flip linear both;
      animation-timeline: view();
      animation-range: cover 15% cover 60%;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  .kv-tangle-step {
    transform: none;
  }
}

/* ---- responsive -------------------------------------------------------- */

@media screen and (max-width: 767px) {
  .kv-hero {
    padding-top: calc(var(--header-h-mobile) + var(--space-7));
  }

  .kv-hero-title,
  .kv-cta-title {
    font-size: var(--font-size-h1);
    hyphens: auto;
  }

  .kv-hero-line {
    height: 140px;
  }

  .kv-hero-legend {
    flex-direction: column;
  }

  .kv-hero-legend-after {
    text-align: left;
  }

  .kv-chapter {
    padding-block: var(--space-8);
  }

  .kv-chapter-inner {
    gap: var(--space-4);
  }

  .kv-chapter-rail {
    flex-basis: 40px;
  }

  .kv-chapter-num {
    padding-left: var(--space-3);
    font-size: var(--font-size-body-md);
  }

  .kv-hours-grid {
    --kv-cell: 20px;
    background-image: radial-gradient(circle, var(--color-dark-muted) 0 5px, transparent 6px);
  }

  .kv-hours-fill {
    background-image: radial-gradient(circle, var(--color-green) 0 5px, transparent 6px);
  }
}