/* Koi Prep static landing page styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --kp-ink: #0F1E3D;
  --kp-text: #33415C;
  --kp-muted: #4E586E;
  --kp-accent: #C2410C;
  --kp-accent-hover: #9A3412;
  --kp-koi: #F76707;
  --kp-blue: #1D4ED8;
  --kp-blue-dark: #1E3A8A;
  --kp-blue-bg: #EFF4FF;
  --kp-bg: #FFFFFF;
  --kp-surface: #F5F6FA;
  --kp-warm-bg: #FFF7F1;
  --kp-warm-badge: #FFF1E8;
  --kp-warm-border: #F3D9C8;
  --kp-border: #E3E6EE;
  --kp-input-border: #CDD3DF;
  --kp-error: #B42318;
  --kp-error-bg: #FEF3F2;
  --kp-success: #15803D;
  --kp-success-bg: #F0FDF4;
  --kp-success-border: #BBF7D0;
}

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

body {
  margin: 0;
  background: var(--kp-bg);
  color: var(--kp-ink);
  font-family: 'Plus Jakarta Sans', 'Noto Sans TC', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 18px;
  line-height: 1.6;
}

html[lang="zh-Hant"] body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
}

html[lang="zh-Hans"] body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
}

a {
  color: var(--kp-blue);
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

a:hover {
  color: var(--kp-blue-dark);
}

:focus-visible {
  outline: 2.5px solid var(--kp-blue);
  outline-offset: 2px;
}

.kp-skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 100;
  padding: 10px 18px;
  background: var(--kp-ink);
  color: #FFFFFF;
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
}

.kp-skip-link:focus {
  top: 12px;
}

/* Header */
.kp-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--kp-border);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
}

.kp-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
}

.kp-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--kp-ink);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.01em;
  min-height: 44px;
}

.kp-brand:hover {
  color: var(--kp-ink);
}

.kp-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
  flex: 1 1 auto;
  font-size: 16px;
  font-weight: 600;
}

.kp-nav a {
  color: var(--kp-text);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.kp-nav a:hover {
  color: var(--kp-ink);
}

.kp-lang-group {
  display: inline-flex;
  border: 1px solid var(--kp-input-border);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
  margin-left: auto;
  background: #FFFFFF;
}

.kp-lang-btn {
  min-height: 38px;
  min-width: 50px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--kp-text);
}

.kp-lang-btn[aria-current="true"],
.kp-lang-btn[aria-pressed="true"] {
  background: var(--kp-ink);
  color: #FFFFFF;
}

.kp-signin {
  color: var(--kp-ink);
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 6px;
}

/* Buttons */
.kp-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  padding: 0 26px;
  border: 0;
  border-radius: 12px;
  background: var(--kp-accent);
  color: #FFFFFF !important;
  text-decoration: none;
  font: inherit;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.kp-btn-primary:hover {
  background: var(--kp-accent-hover);
  color: #FFFFFF !important;
}

.kp-btn-primary:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.kp-btn-sm {
  min-height: 44px;
  padding: 0 20px;
  border-radius: 10px;
  font-size: 16px;
}

.kp-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  padding: 0 22px;
  border-radius: 12px;
  border: 1.5px solid var(--kp-input-border);
  background: #FFFFFF;
  color: var(--kp-ink) !important;
  text-decoration: none;
  font: inherit;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
}

.kp-btn-secondary:hover {
  border-color: var(--kp-ink);
  background: var(--kp-surface);
}

.kp-btn-navy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 0;
  border-radius: 10px;
  background: var(--kp-ink);
  color: #FFFFFF;
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.kp-btn-navy:hover {
  background: #1B315E;
}

.kp-btn-navy:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Sections & Layout */
.kp-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
}

.kp-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 48px;
  align-items: center;
}

.kp-eyebrow {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--kp-warm-badge);
  color: var(--kp-accent-hover);
  font-size: 15px;
  font-weight: 700;
}

.kp-h1 {
  margin: 0;
  font-size: clamp(36px, 4.8vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 800;
}

.kp-h2 {
  margin: 0;
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
}

/* Waitlist form & modern :user-invalid / :user-valid validation */
.kp-waitlist-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 560px;
}

.kp-waitlist-form {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: flex-end;
}

.kp-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1 1 260px;
  text-align: left;
}

.kp-field-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.kp-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--kp-ink);
}

.kp-hint {
  font-size: 13px;
  color: var(--kp-muted);
}

.kp-input {
  min-height: 54px;
  padding: 0 16px;
  border: 1.5px solid var(--kp-input-border);
  border-radius: 12px;
  background: #FFFFFF;
  font: inherit;
  font-size: 17px;
  color: var(--kp-ink);
  width: 100%;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.kp-input:focus {
  border-color: var(--kp-blue);
}

.kp-field-error {
  display: none;
  color: var(--kp-error);
  font-size: 14px;
  font-weight: 600;
  margin-top: 4px;
}

.kp-input:user-invalid,
.kp-input.is-invalid {
  border-color: var(--kp-error);
  background-color: var(--kp-error-bg);
}

.kp-input:user-invalid + .kp-field-error,
.kp-input.is-invalid + .kp-field-error {
  display: block;
}

.kp-input:user-valid {
  border-color: var(--kp-success);
}

.kp-waitlist-success {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  border-radius: 14px;
  background: var(--kp-success-bg);
  border: 1.5px solid var(--kp-success-border);
  color: #14532D;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
}

/* Preview card */
.kp-preview-shell {
  background: var(--kp-surface);
  border-radius: 24px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.kp-preview-card {
  background: #FFFFFF;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 1px 2px rgba(15, 30, 61, 0.06), 0 8px 24px rgba(15, 30, 61, 0.06);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.kp-skill-row {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr) 96px;
  gap: 12px;
  align-items: center;
  font-size: 15px;
}

/* Interactive Sample Question */
.kp-option-btn {
  display: flex;
  gap: 14px;
  align-items: center;
  text-align: left;
  width: 100%;
  min-height: 56px;
  padding: 10px 16px;
  border-radius: 12px;
  border: 2px solid var(--kp-input-border);
  background: #FFFFFF;
  font: inherit;
  font-size: 17px;
  color: var(--kp-ink);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.kp-option-btn:hover:not(:disabled) {
  border-color: var(--kp-ink);
}

.kp-option-btn[aria-pressed="true"] {
  border-color: var(--kp-accent);
  background: #FFF4ED;
}

.kp-option-btn.is-correct {
  border-color: var(--kp-blue);
  background: var(--kp-blue-bg);
}

.kp-option-btn.is-wrong {
  border-color: var(--kp-error);
  background: var(--kp-error-bg);
}

.kp-option-box {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 7px;
  border: 2px solid #76839B;
  background: #FFFFFF;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
}

.kp-option-btn[aria-pressed="true"] .kp-option-box {
  border-color: var(--kp-ink);
  background: var(--kp-ink);
}

/* 2026 Computer-Adaptive Test (CAT) Telemetry Bar */
.kp-cat-header {
  display: flex;
  flex-wrap: nowrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--kp-surface);
  border: 1px solid var(--kp-border);
}

.kp-cat-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  flex: 1 1 auto;
}

.kp-cat-step-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.kp-cat-step-text {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--kp-muted);
}

.kp-cat-dots {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.kp-cat-dot {
  width: 24px;
  height: 8px;
  border-radius: 999px;
  background: #D5DCE8;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.kp-cat-dot.is-active {
  background: var(--kp-ink);
  transform: scaleY(1.2);
}

.kp-cat-dot.is-correct {
  background: var(--kp-success);
}

.kp-cat-dot.is-wrong {
  background: var(--kp-accent);
}

.kp-cat-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.kp-cat-tier-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
}

.kp-cat-tier-badge[data-tier="1"] {
  background: #FEF3C7;
  color: #92400E;
}

.kp-cat-tier-badge[data-tier="2"] {
  background: #DBEAFE;
  color: #1E40AF;
}

.kp-cat-tier-badge[data-tier="3"] {
  background: #E0E7FF;
  color: #3730A3;
}

.kp-cat-tier-badge[data-tier="4"] {
  background: #FCE7F3;
  color: #9D174D;
}

.kp-cat-domain {
  font-size: 13px;
  font-weight: 600;
  color: var(--kp-muted);
}

.kp-cat-score-panel {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  flex: 0 0 auto;
  min-width: 145px;
}

.kp-cat-score-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--kp-muted);
}

.kp-cat-score-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.kp-cat-score-val {
  font-size: 22px;
  font-weight: 800;
  color: var(--kp-ink);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.kp-cat-score-delta {
  font-size: 13px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 999px;
}

.kp-cat-score-delta.is-up {
  background: var(--kp-success-bg);
  color: var(--kp-success);
}

.kp-cat-score-delta.is-down {
  background: #FFF4ED;
  color: var(--kp-accent-hover);
}

.kp-cat-meter {
  width: 100%;
  max-width: 180px;
  height: 6px;
  border-radius: 999px;
  background: #E2E8F0;
  overflow: hidden;
}

.kp-cat-meter-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #3B82F6 0%, #1D4ED8 60%, #F76707 100%);
  transition: width 0.35s ease;
}

.kp-cat-routing-banner {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border-radius: 12px;
  font-size: 15px;
  line-height: 1.45;
  border: 1.5px solid var(--kp-border);
  background: var(--kp-surface);
}

.kp-cat-routing-banner.is-up {
  background: #F0FDF4;
  border-color: #BBF7D0;
  color: #14532D;
}

.kp-cat-routing-banner.is-down {
  background: #FFF7ED;
  border-color: #FED7AA;
  color: #7C2D12;
}

@media (max-width: 640px) {
  .kp-cat-header {
    flex-wrap: wrap;
  }
  .kp-cat-score-panel {
    align-items: flex-start;
    width: 100%;
    padding-top: 8px;
    border-top: 1px solid var(--kp-border);
  }
  .kp-cat-meter {
    max-width: 100%;
  }
}

/* Details / Accordion */
details.kp-faq-item {
  background: #FFFFFF;
  border-radius: 14px;
  border: 1px solid var(--kp-border);
  padding: 0 20px;
}

details.kp-faq-item summary {
  list-style: none;
  cursor: pointer;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-weight: 700;
  font-size: 18px;
}

details.kp-faq-item summary::-webkit-details-marker {
  display: none;
}

.kp-faq-icon {
  font-size: 24px;
  color: var(--kp-muted);
  font-weight: 400;
  transition: transform 0.15s ease;
}

details.kp-faq-item[open] .kp-faq-icon {
  transform: rotate(45deg);
}

/* Dialogs */
dialog.kp-dialog {
  max-width: 600px;
  width: calc(100% - 32px);
  border: 1px solid var(--kp-border);
  border-radius: 20px;
  padding: 28px;
  background: #FFFFFF;
  color: var(--kp-ink);
  box-shadow: 0 20px 48px rgba(15, 30, 61, 0.22);
}

dialog.kp-dialog::backdrop {
  background: rgba(15, 30, 61, 0.45);
}

/* Mobile Sticky Bar */
.kp-sticky {
  display: none;
}

@media (max-width: 640px) {
  .kp-sticky {
    display: flex;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 25;
    padding: 12px 16px;
    background: #FFFFFF;
    border-top: 1px solid var(--kp-border);
    box-shadow: 0 -4px 16px rgba(15, 30, 61, 0.06);
  }
  .kp-hide-sm {
    display: none !important;
  }
  .kp-pad-bottom {
    padding-bottom: 92px;
  }
  .kp-hero {
    padding: 40px 20px;
    gap: 32px;
  }
  .kp-container {
    padding: 56px 20px;
  }
  .kp-skill-row {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) 82px;
    font-size: 14px;
  }
}