/* ==========================================================================
   Kling v4, Kling v3 & Kling v3 Turbo — Yellow Industrial Studio Pass
   Design: Perforated Cinema Ticket & Brutalist Yellow Pass (/kling-v4)
   Palette: Safety Yellow (#FFD600), Stark Paper (#FFFFFF), Jet Black (#0A0A0A),
            Stamp Red (#DC2626), Warm Ivory (#FFFBEB)
   ========================================================================== */

:root {
  --kv-yellow: #FFD600;
  --kv-yellow-soft: #FFF8CC;
  --kv-paper: #FFFFFF;
  --kv-ink: #0A0A0A;
  --kv-muted: #3F3F46;
  --kv-stamp: #DC2626;
  --kv-stamp-bg: #FEF2F2;
  --kv-border: #0A0A0A;
  --kv-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --kv-font-mono: 'IBM Plex Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--kv-yellow);
  color: var(--kv-ink);
  font-family: var(--kv-font-sans);
}

body.kv-pass-body {
  margin: 0;
  background-color: var(--kv-yellow);
  color: var(--kv-ink);
  line-height: 1.5;
  overflow-x: hidden;
  border: 6px solid var(--kv-ink);
  min-height: 100vh;
}

.kv-container {
  width: min(1180px, calc(100% - 2.5rem));
  margin-inline: auto;
}

/* Header / Top Studio Pass Bar */
.kv-header {
  background: var(--kv-yellow);
  border-bottom: 3px solid var(--kv-ink);
  position: sticky;
  top: 0;
  z-index: 50;
}

.kv-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  flex-wrap: wrap;
}

.kv-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--kv-ink);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
}

.kv-brand__tag {
  background: var(--kv-ink);
  color: var(--kv-yellow);
  font-family: var(--kv-font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.22rem 0.55rem;
  letter-spacing: 0.06em;
}

.kv-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  flex-wrap: wrap;
}

.kv-nav a {
  color: var(--kv-ink);
  text-decoration: none;
  font-weight: 800;
  font-size: 0.92rem;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.kv-nav a:hover {
  border-bottom-color: var(--kv-ink);
}

.kv-header__actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.kv-lang-select {
  appearance: none;
  background: var(--kv-paper);
  color: var(--kv-ink);
  border: 2.5px solid var(--kv-ink);
  padding: 0.48rem 0.75rem;
  font-family: var(--kv-font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--kv-ink);
}

.kv-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--kv-ink);
  color: var(--kv-yellow);
  border: 3px solid var(--kv-ink);
  padding: 0.95rem 1.75rem;
  font-weight: 900;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
  box-shadow: 5px 5px 0 rgba(10, 10, 10, 0.26);
}

.kv-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--kv-ink);
}

.kv-btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
  box-shadow: 3px 3px 0 rgba(10, 10, 10, 0.25);
}

.kv-btn--outline {
  background: var(--kv-paper);
  color: var(--kv-ink);
  box-shadow: 5px 5px 0 var(--kv-ink);
}

/* HERO: PERFORATED STUDIO PASS TICKET */
.kv-hero {
  padding: 2.5rem 0 3.5rem;
}

.kv-hero__banner-title {
  font-size: clamp(1.5rem, 3.2vw, 2.6rem);
  font-weight: 900;
  letter-spacing: -0.035em;
  text-align: center;
  margin: 0 0 1.5rem;
  text-transform: uppercase;
}

.kv-ticket {
  position: relative;
  background: var(--kv-paper);
  border: 3.5px solid var(--kv-ink);
  box-shadow: 12px 12px 0 var(--kv-ink);
  padding: clamp(1.5rem, 4vw, 3.25rem) clamp(1.5rem, 5vw, 4.5rem);
  max-width: 1020px;
  margin: 0 auto;
  overflow: hidden;
}

/* Perforated side notches + dashed tear lines */
.kv-ticket::before,
.kv-ticket::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 44px;
  height: 44px;
  background: var(--kv-yellow);
  border: 3.5px solid var(--kv-ink);
  border-radius: 50%;
  transform: translateY(-50%);
  z-index: 3;
}

.kv-ticket::before {
  left: -25px;
}

.kv-ticket::after {
  right: -25px;
}

.kv-ticket__perforation-left,
.kv-ticket__perforation-right {
  position: absolute;
  top: 1.25rem;
  bottom: 1.25rem;
  border-left: 2.5px dashed var(--kv-ink);
  opacity: 0.45;
  pointer-events: none;
}

.kv-ticket__perforation-left {
  left: 26px;
}

.kv-ticket__perforation-right {
  right: 26px;
}

/* Pure CSS Industrial Barcode */
.kv-barcode {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 1.4rem;
}

.kv-barcode__bars {
  width: min(680px, 100%);
  height: 48px;
  background: repeating-linear-gradient(
    90deg,
    #0A0A0A 0px,
    #0A0A0A 3px,
    transparent 3px,
    transparent 6px,
    #0A0A0A 6px,
    #0A0A0A 11px,
    transparent 11px,
    transparent 14px,
    #0A0A0A 14px,
    #0A0A0A 16px,
    transparent 16px,
    transparent 21px,
    #0A0A0A 21px,
    #0A0A0A 28px,
    transparent 28px,
    transparent 31px
  );
  border-bottom: 2px solid var(--kv-ink);
}

.kv-barcode__code {
  margin-top: 0.45rem;
  font-family: var(--kv-font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.kv-ticket__title {
  font-size: clamp(2.1rem, 4.7vw, 3.85rem);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -0.035em;
  text-align: center;
  margin: 0.5rem 0 1rem;
  text-transform: uppercase;
}

.kv-ticket__lead {
  max-width: 780px;
  margin: 0 auto 1.65rem;
  text-align: center;
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  font-weight: 600;
  color: var(--kv-muted);
}

/* Tilted Red Ink Stamp */
.kv-stamp-wrap {
  display: flex;
  justify-content: center;
  margin: 1.4rem 0 1.85rem;
}

.kv-stamp {
  display: inline-block;
  border: 4px solid var(--kv-stamp);
  background: var(--kv-stamp-bg);
  color: var(--kv-stamp);
  padding: 0.65rem 1.6rem;
  font-weight: 900;
  font-size: clamp(1.15rem, 2.5vw, 1.85rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transform: rotate(-2.2deg);
  box-shadow: 0 0 0 2px var(--kv-paper) inset;
  text-align: center;
}

/* Interactive 3-Model Toggle Pill inside the Ticket */
.kv-pass-selector-label {
  text-align: center;
  font-family: var(--kv-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.65rem;
}

.kv-pass-switch {
  display: flex;
  align-items: stretch;
  justify-content: center;
  border: 3px solid var(--kv-ink);
  border-radius: 999px;
  padding: 0.35rem;
  background: #F4F4F5;
  max-width: 760px;
  margin: 0 auto 1.25rem;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.kv-pass-tab {
  flex: 1 1 180px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border: 2px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--kv-ink);
  padding: 0.7rem 1rem;
  font-family: var(--kv-font-sans);
  font-weight: 800;
  font-size: 0.94rem;
  cursor: pointer;
  transition: all 0.14s ease;
}

.kv-pass-tab__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--kv-ink);
  background: var(--kv-paper);
}

.kv-pass-tab.is-active {
  background: var(--kv-ink);
  color: var(--kv-yellow);
}

.kv-pass-tab.is-active .kv-pass-tab__dot {
  background: var(--kv-yellow);
  border-color: var(--kv-yellow);
}

/* Active Model Readout inside Ticket */
.kv-pass-inspector {
  border: 2.5px solid var(--kv-ink);
  background: var(--kv-yellow-soft);
  padding: 1rem 1.25rem;
  max-width: 760px;
  margin: 0 auto 1.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.kv-pass-inspector__meta {
  font-family: var(--kv-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--kv-ink);
  margin-bottom: 0.3rem;
}

.kv-pass-inspector__prompt {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--kv-ink);
}

.kv-copy-btn {
  background: var(--kv-paper);
  color: var(--kv-ink);
  border: 2px solid var(--kv-ink);
  padding: 0.5rem 0.9rem;
  font-family: var(--kv-font-mono);
  font-weight: 700;
  font-size: 0.78rem;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 3px 3px 0 var(--kv-ink);
}

.kv-ticket__cta-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* SECTIONS */
.kv-section {
  padding: 3.5rem 0;
  border-top: 3px solid var(--kv-ink);
}

.kv-section--paper {
  background: var(--kv-paper);
}

.kv-section__head {
  max-width: 820px;
  margin-bottom: 2.2rem;
}

.kv-section__index {
  display: inline-block;
  background: var(--kv-ink);
  color: var(--kv-yellow);
  font-family: var(--kv-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  margin-bottom: 0.65rem;
}

.kv-section__title {
  font-size: clamp(1.75rem, 3.2vw, 2.65rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 0.75rem;
}

.kv-section__lead {
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--kv-muted);
  margin: 0;
}

/* 3-Model Cards Grid */
.kv-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.kv-card {
  background: var(--kv-paper);
  border: 3px solid var(--kv-ink);
  box-shadow: 8px 8px 0 var(--kv-ink);
  padding: 1.65rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
}

.kv-section--paper .kv-card {
  background: var(--kv-yellow-soft);
}

.kv-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--kv-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  border-bottom: 2px dashed var(--kv-ink);
  padding-bottom: 0.6rem;
  margin-bottom: 0.9rem;
}

.kv-card__badge {
  background: var(--kv-stamp);
  color: #FFFFFF;
  padding: 0.15rem 0.5rem;
}

.kv-card__title {
  font-size: 1.32rem;
  font-weight: 900;
  margin: 0 0 0.6rem;
  letter-spacing: -0.02em;
}

.kv-card__desc {
  margin: 0;
  font-size: 0.97rem;
  font-weight: 500;
  color: var(--kv-ink);
}

.kv-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 2px solid var(--kv-ink);
  padding-top: 0.85rem;
  font-family: var(--kv-font-mono);
  font-size: 0.82rem;
  font-weight: 700;
}

.kv-card__link {
  color: var(--kv-ink);
  text-decoration: none;
  font-weight: 900;
}

/* Interactive Tariff & Batch Calculator */
.kv-calc {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 1.75rem;
  background: var(--kv-paper);
  border: 3.5px solid var(--kv-ink);
  box-shadow: 10px 10px 0 var(--kv-ink);
  padding: 1.85rem;
}

.kv-calc__group + .kv-calc__group {
  margin-top: 1.35rem;
}

.kv-calc__label {
  display: block;
  font-family: var(--kv-font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.55rem;
}

.kv-calc__switch {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.6rem;
}

.kv-calc-btn {
  text-align: left;
  background: var(--kv-yellow-soft);
  color: var(--kv-ink);
  border: 2.5px solid var(--kv-ink);
  padding: 0.7rem 0.85rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.kv-calc-btn strong {
  font-size: 0.92rem;
  font-weight: 900;
}

.kv-calc-btn small {
  font-size: 0.76rem;
  opacity: 0.85;
}

.kv-calc-btn.is-active {
  background: var(--kv-ink);
  color: var(--kv-yellow);
}

.kv-calc__readout {
  background: var(--kv-yellow);
  border: 3px solid var(--kv-ink);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 0.65rem;
}

.kv-calc__caption {
  font-family: var(--kv-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
}

.kv-calc__price {
  font-size: clamp(2.4rem, 4.5vw, 3.6rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
}

.kv-calc__sub {
  font-size: 0.92rem;
  font-weight: 700;
}

.kv-steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.kv-step-card {
  background: var(--kv-paper);
  border: 2.5px solid var(--kv-ink);
  padding: 1.25rem;
  box-shadow: 5px 5px 0 var(--kv-ink);
}

.kv-step-card__num {
  display: inline-block;
  background: var(--kv-ink);
  color: var(--kv-yellow);
  font-family: var(--kv-font-mono);
  font-weight: 700;
  font-size: 0.76rem;
  padding: 0.18rem 0.5rem;
  margin-bottom: 0.55rem;
}

.kv-step-card p {
  margin: 0;
  font-weight: 600;
  font-size: 0.94rem;
}

/* Comparison Table */
.kv-table-wrap {
  overflow-x: auto;
  border: 3px solid var(--kv-ink);
  box-shadow: 9px 9px 0 var(--kv-ink);
  background: var(--kv-paper);
}

.kv-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

.kv-table th,
.kv-table td {
  padding: 1rem 1.15rem;
  border: 2px solid var(--kv-ink);
  text-align: left;
  font-size: 0.94rem;
}

.kv-table thead th {
  background: var(--kv-ink);
  color: var(--kv-paper);
  font-family: var(--kv-font-mono);
  font-size: 0.84rem;
  text-transform: uppercase;
}

.kv-table thead th.is-highlighted {
  background: var(--kv-stamp);
  color: #FFFFFF;
}

.kv-table tbody td.is-highlighted {
  background: var(--kv-yellow-soft);
  font-weight: 800;
}

.kv-crosslinks {
  margin-top: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.kv-crosslinks__label {
  font-weight: 800;
  font-size: 0.92rem;
}

.kv-crosslinks__list {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.kv-crosslinks__item {
  background: var(--kv-paper);
  color: var(--kv-ink);
  border: 2px solid var(--kv-ink);
  padding: 0.38rem 0.8rem;
  font-weight: 800;
  font-size: 0.84rem;
  text-decoration: none;
  box-shadow: 3px 3px 0 var(--kv-ink);
}

/* FAQ */
.kv-faq-list {
  display: grid;
  gap: 0.9rem;
}

.kv-faq-item {
  background: var(--kv-paper);
  border: 3px solid var(--kv-ink);
  box-shadow: 6px 6px 0 var(--kv-ink);
}

.kv-faq-item__q {
  list-style: none;
  cursor: pointer;
  padding: 1.1rem 1.35rem;
  font-weight: 900;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.kv-faq-item__q::-webkit-details-marker {
  display: none;
}

.kv-faq-item__idx {
  background: var(--kv-ink);
  color: var(--kv-yellow);
  font-family: var(--kv-font-mono);
  font-size: 0.76rem;
  padding: 0.2rem 0.5rem;
}

.kv-faq-item__a {
  padding: 0 1.35rem 1.25rem;
  border-top: 2px dashed var(--kv-ink);
  font-weight: 500;
}

.kv-faq-item__a p {
  margin: 0.9rem 0 0;
}

/* FINAL PASS CTA */
.kv-final {
  padding: 3.5rem 0 4rem;
  border-top: 3px solid var(--kv-ink);
}

.kv-final__box {
  background: var(--kv-paper);
  border: 3.5px solid var(--kv-ink);
  box-shadow: 12px 12px 0 var(--kv-ink);
  padding: clamp(1.75rem, 4vw, 3rem);
  text-align: center;
}

.kv-final__meta {
  font-family: var(--kv-font-mono);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.65rem;
}

.kv-final__title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 900;
  margin: 0 0 0.75rem;
  letter-spacing: -0.03em;
}

.kv-final__lead {
  max-width: 720px;
  margin: 0 auto 1.5rem;
  font-weight: 600;
  color: var(--kv-muted);
}

.kv-final__actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* FOOTER */
.kv-footer {
  background: var(--kv-ink);
  color: var(--kv-paper);
  padding: 1.75rem 0;
}

.kv-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

.kv-footer__nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.kv-footer__nav a {
  color: var(--kv-yellow);
  text-decoration: none;
  font-weight: 700;
}

@media (max-width: 860px) {
  .kv-calc {
    grid-template-columns: 1fr;
  }
  .kv-ticket__perforation-left,
  .kv-ticket__perforation-right {
    display: none;
  }
}