.kttc-app {
  --kttc-navy: #031f35;
  --kttc-navy-2: #082f4b;
  --kttc-cream: #fffbea;
  --kttc-pink: #f54877;
  --kttc-coral: #f56b55;
  --kttc-teal: #18b9b9;
  --kttc-gold: #f5b82e;
  --kttc-blue: #498ad2;
  --kttc-ink: #11283b;
  --kttc-muted: #5c6d79;
  --kttc-line: #dfe8ea;
  --kttc-shadow: 0 24px 70px rgba(3, 31, 53, 0.17);
  width: min(100%, 1160px);
  margin: 24px auto;
  color: var(--kttc-ink);
  font-family: "Poppins", "Avenir Next", Avenir, Montserrat, Arial, sans-serif;
  line-height: 1.55;
}

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

.kttc-app button,
.kttc-app input {
  font: inherit;
}

.kttc-app button {
  cursor: pointer;
}

.kttc-app [hidden] {
  display: none !important;
}

.kttc-shell {
  overflow: hidden;
  min-height: 720px;
  border: 1px solid rgba(3, 31, 53, 0.12);
  border-radius: 28px;
  background:
    radial-gradient(circle at 10% 10%, rgba(24, 185, 185, 0.09), transparent 29%),
    radial-gradient(circle at 92% 84%, rgba(245, 72, 119, 0.08), transparent 30%),
    #f7fbfa;
  box-shadow: var(--kttc-shadow);
}

.kttc-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
  padding: 12px 24px;
  color: var(--kttc-cream);
  background: linear-gradient(125deg, var(--kttc-navy), var(--kttc-navy-2));
}

.kttc-brand {
  display: flex;
  align-items: center;
  gap: 13px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.kttc-brand img {
  width: 58px;
  height: 58px;
  object-fit: contain;
}

.kttc-top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.kttc-icon-button,
.kttc-teacher-link {
  min-height: 39px;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 999px;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  transition: background 160ms ease, transform 160ms ease;
}

.kttc-icon-button:hover,
.kttc-teacher-link:hover {
  background: rgba(255, 255, 255, 0.17);
  transform: translateY(-1px);
}

.kttc-icon-button {
  width: 39px;
  padding: 0;
  font-weight: 900;
}

.kttc-teacher-link {
  padding: 7px 15px;
  font-size: 13px;
  font-weight: 700;
}

.kttc-main {
  min-height: 638px;
}

.kttc-screen {
  padding: clamp(30px, 6vw, 70px);
}

.kttc-intro,
.kttc-complete {
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
}

.kttc-intro-emblem {
  position: relative;
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  margin: 0 auto 22px;
  border-radius: 50%;
  background: linear-gradient(145deg, #ffd75f, var(--kttc-gold));
  box-shadow: 0 13px 28px rgba(245, 184, 46, 0.33), inset 0 2px 2px rgba(255, 255, 255, 0.65);
}

.kttc-keyhole-large,
.kttc-keyhole {
  position: relative;
  display: inline-block;
  width: 22px;
  height: 38px;
}

.kttc-keyhole-large::before,
.kttc-keyhole::before {
  position: absolute;
  top: 0;
  left: 50%;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--kttc-navy);
  transform: translateX(-50%);
  content: "";
}

.kttc-keyhole-large::after,
.kttc-keyhole::after {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 12px;
  height: 25px;
  border-radius: 4px 4px 8px 8px;
  background: var(--kttc-navy);
  transform: translateX(-50%);
  clip-path: polygon(25% 0, 75% 0, 100% 100%, 0 100%);
  content: "";
}

.kttc-eyebrow,
.kttc-question-kicker {
  margin: 0 0 8px !important;
  color: var(--kttc-pink);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.kttc-intro h1,
.kttc-complete h2,
.kttc-question-content h2,
.kttc-modal-card h2 {
  margin: 0;
  color: var(--kttc-navy);
  line-height: 1.16;
}

.kttc-intro h1 {
  font-size: clamp(31px, 5vw, 52px);
}

.kttc-scenario {
  max-width: 740px;
  margin: 22px auto 30px;
  color: #3d5362;
  font-size: 17px;
}

.kttc-scenario p {
  margin: 0 0 10px;
}

.kttc-field-label {
  display: block;
  margin: 0 0 7px;
  color: var(--kttc-navy);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.kttc-start-row,
.kttc-password-row {
  display: flex;
  gap: 10px;
}

.kttc-start-row {
  max-width: 680px;
  margin: 0 auto;
}

.kttc-app input {
  width: 100%;
  min-height: 52px;
  padding: 12px 17px;
  border: 2px solid #d8e3e5;
  border-radius: 13px;
  color: var(--kttc-ink);
  background: #fff;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.kttc-app input:focus {
  border-color: var(--kttc-teal);
  box-shadow: 0 0 0 4px rgba(24, 185, 185, 0.14);
}

.kttc-app input[aria-invalid="true"] {
  border-color: var(--kttc-pink);
}

.kttc-button,
.kttc-secondary-button {
  min-height: 52px;
  padding: 11px 22px;
  border-radius: 13px;
  font-weight: 850;
  white-space: nowrap;
  transition: transform 160ms ease, box-shadow 160ms ease, opacity 160ms ease;
}

.kttc-button {
  border: 0;
  color: #fff;
  background: linear-gradient(135deg, var(--kttc-pink), #de3868);
  box-shadow: 0 9px 20px rgba(245, 72, 119, 0.25);
}

.kttc-button:hover:not(:disabled),
.kttc-secondary-button:hover:not(:disabled) {
  transform: translateY(-2px);
}

.kttc-button:disabled,
.kttc-secondary-button:disabled {
  cursor: wait;
  opacity: 0.62;
}

.kttc-secondary-button {
  border: 1px solid #cad7da;
  color: var(--kttc-navy);
  background: #fff;
}

.kttc-intro-note {
  max-width: 650px;
  margin: 20px auto 0;
  color: var(--kttc-muted);
  font-size: 13px;
}

.kttc-resume-panel {
  max-width: 680px;
  margin: 18px auto 0;
  padding: 16px;
  border: 1px solid #bcdfe0;
  border-radius: 14px;
  background: #effafa;
}

.kttc-resume-panel p {
  margin: 0 0 12px;
  font-weight: 700;
}

.kttc-resume-panel button + button {
  margin-left: 8px;
}

.kttc-mission {
  padding-top: 28px;
}

.kttc-statusbar {
  display: grid;
  grid-template-columns: 1.2fr 1fr 0.7fr;
  gap: 12px;
  margin-bottom: 14px;
}

.kttc-statusbar > div {
  padding: 12px 16px;
  border: 1px solid var(--kttc-line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.85);
}

.kttc-status-label {
  display: block;
  margin-bottom: 2px;
  color: var(--kttc-muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.kttc-statusbar strong {
  color: var(--kttc-navy);
  font-size: 16px;
}

.kttc-progress-track {
  overflow: hidden;
  height: 10px;
  border-radius: 999px;
  background: #dfe9e9;
}

.kttc-progress-fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--kttc-teal), var(--kttc-blue));
  transition: width 550ms ease;
}

.kttc-key-collection {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: 17px 0;
}

.kttc-mini-key {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 2px solid #cedadc;
  border-radius: 50% 50% 50% 7px;
  color: #b6c5c8;
  font-size: 9px;
  background: #fff;
  transform: rotate(-45deg);
  transition: all 320ms ease;
}

.kttc-mini-key.is-collected {
  border-color: #d69a0a;
  color: #8a5a00;
  background: linear-gradient(145deg, #ffe57f, var(--kttc-gold));
  box-shadow: 0 4px 12px rgba(245, 184, 46, 0.32);
}

.kttc-mini-key.is-current {
  border-color: var(--kttc-pink);
  animation: kttc-pulse 1.7s infinite;
}

.kttc-door-stage {
  position: relative;
  max-width: 900px;
  min-height: 520px;
  margin: 0 auto;
  perspective: 1800px;
}

.kttc-glow {
  position: absolute;
  inset: 28px;
  border-radius: 24px;
  background: radial-gradient(circle, rgba(255, 220, 91, 0.88), rgba(24, 185, 185, 0.2) 43%, transparent 70%);
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 450ms ease, transform 600ms ease;
}

.kttc-door-stage:has(.kttc-door.is-opening) .kttc-glow {
  opacity: 1;
  transform: scale(1.03);
}

.kttc-door {
  position: relative;
  z-index: 2;
  overflow: hidden;
  min-height: 520px;
  border: 1px solid rgba(3, 31, 53, 0.12);
  border-top: 7px solid var(--kttc-navy);
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 18px 45px rgba(3, 31, 53, 0.13);
  transform-origin: left center;
  transform-style: preserve-3d;
  transition: transform 700ms cubic-bezier(0.55, 0.07, 0.33, 0.95), opacity 500ms ease;
}

.kttc-door::before {
  position: absolute;
  top: 0;
  right: 0;
  width: 170px;
  height: 170px;
  border-radius: 0 0 0 100%;
  background: linear-gradient(145deg, rgba(24, 185, 185, 0.11), rgba(73, 138, 210, 0.04));
  content: "";
  pointer-events: none;
}

.kttc-door.is-opening {
  opacity: 0.18;
  transform: rotateY(-88deg);
}

.kttc-door.is-denied {
  animation: kttc-shake 430ms ease;
}

.kttc-question-content {
  padding: clamp(25px, 5vw, 46px);
}

.kttc-question-content h2 {
  position: relative;
  max-width: 720px;
  font-size: clamp(25px, 3.8vw, 38px);
}

.kttc-background-block,
.kttc-task-block {
  position: relative;
  margin-top: 24px;
  padding: 20px 22px;
  border-radius: 15px;
}

.kttc-background-block {
  border-left: 5px solid var(--kttc-teal);
  background: #f0fafa;
}

.kttc-task-block {
  border-left: 5px solid var(--kttc-pink);
  background: #fff4f7;
}

.kttc-question-content h3 {
  margin: 0 0 8px;
  color: var(--kttc-navy);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.kttc-question-content p,
.kttc-question-content li {
  font-size: 16px;
}

.kttc-question-content p:last-child,
.kttc-question-content ul:last-child,
.kttc-question-content ol:last-child {
  margin-bottom: 0;
}

.kttc-question-content ol,
.kttc-question-content ul {
  padding-left: 23px;
}

.kttc-formula {
  margin: 14px 0;
  padding: 14px 18px;
  border: 1px dashed #8bbdc0;
  border-radius: 10px;
  color: var(--kttc-navy);
  background: #fff;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 20px;
  font-weight: 700;
  text-align: center;
}

.kttc-data-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  overflow: hidden;
  margin-top: 12px;
  border: 1px solid #d5e7e7;
  border-radius: 11px;
  background: #fff;
}

.kttc-data-grid span,
.kttc-data-grid strong {
  padding: 9px 13px;
  border-bottom: 1px solid #e4eeee;
}

.kttc-data-grid span:nth-last-child(-n+2),
.kttc-data-grid strong:nth-last-child(-n+2) {
  border-bottom: 0;
}

.kttc-data-grid strong {
  color: var(--kttc-navy);
  background: #f7fbfb;
}

.kttc-unlock-panel {
  position: relative;
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 18px;
  align-items: center;
  min-height: 126px;
  padding: 23px clamp(24px, 5vw, 46px);
  border-top: 1px solid var(--kttc-line);
  background: linear-gradient(90deg, #f7faf9, #eef6f5);
}

.kttc-lock-mechanism {
  position: relative;
  justify-self: center;
  width: 54px;
  height: 54px;
  overflow: visible;
}

.kttc-lock-mechanism .kttc-keyhole {
  position: absolute;
  z-index: 2;
  top: 8px;
  left: 16px;
  justify-self: center;
  transform: scale(1.25);
}

.kttc-password-input {
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-weight: 800;
}

.kttc-feedback {
  min-height: 21px;
  margin: 7px 0 0;
  color: var(--kttc-muted);
  font-size: 13px;
  font-weight: 700;
}

.kttc-feedback.is-error {
  color: #c82d53;
}

.kttc-feedback.is-success {
  color: #087f76;
}

.kttc-key-animation {
  position: absolute;
  z-index: 1;
  top: 11px;
  left: -150px;
  width: 96px;
  height: 32px;
  opacity: 0;
  transform: rotate(0deg);
  transform-origin: 88px 16px;
  transition: left 520ms cubic-bezier(0.2, 0.82, 0.2, 1), opacity 140ms ease;
  pointer-events: none;
}

.kttc-key-head {
  position: absolute;
  left: 0;
  top: 2px;
  width: 30px;
  height: 30px;
  border: 8px solid var(--kttc-gold);
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px #d48d08, 0 3px 5px rgba(3, 31, 53, 0.24);
}

.kttc-key-shaft {
  position: absolute;
  left: 27px;
  top: 12px;
  width: 61px;
  height: 9px;
  border-radius: 4px;
  background: linear-gradient(#ffe071, var(--kttc-gold));
  box-shadow: 0 3px 3px rgba(3, 31, 53, 0.2);
}

.kttc-key-tooth {
  position: absolute;
  right: 7px;
  top: 18px;
  width: 19px;
  height: 13px;
  border: solid var(--kttc-gold);
  border-width: 0 7px 7px 0;
}

.kttc-door.is-inserting .kttc-key-animation,
.kttc-door.is-turning .kttc-key-animation,
.kttc-door.is-opening .kttc-key-animation {
  left: -61px;
  opacity: 1;
}

.kttc-door.is-turning .kttc-key-animation,
.kttc-door.is-opening .kttc-key-animation {
  transform: rotate(90deg);
  transition: transform 380ms cubic-bezier(0.35, 0, 0.2, 1);
}

.kttc-reset-link {
  display: block;
  margin: 17px auto 0;
  padding: 5px;
  border: 0;
  color: var(--kttc-muted);
  background: transparent;
  font-size: 12px;
  text-decoration: underline;
}

.kttc-complete {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 620px;
}

.kttc-complete-key {
  display: grid;
  place-items: center;
  width: 120px;
  height: 120px;
  margin-bottom: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 25%, #fff2a5, var(--kttc-gold));
  box-shadow: 0 20px 40px rgba(245, 184, 46, 0.35);
  font-size: 58px;
  animation: kttc-celebrate 900ms cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.kttc-complete h2 {
  font-size: clamp(31px, 5vw, 53px);
}

.kttc-complete > p:not(.kttc-eyebrow) {
  margin: 17px 0 26px;
  color: #405665;
  font-size: 18px;
}

.kttc-confetti {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.kttc-confetti i {
  position: absolute;
  top: -18px;
  left: var(--x);
  width: 9px;
  height: 16px;
  border-radius: 2px;
  animation: kttc-confetti-fall 2.8s var(--delay) ease-in forwards;
}

.kttc-modal {
  position: fixed;
  z-index: 999999;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
}

.kttc-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(2, 22, 38, 0.75);
  backdrop-filter: blur(5px);
}

.kttc-modal-card {
  position: relative;
  z-index: 1;
  overflow-y: auto;
  width: min(100%, 760px);
  max-height: min(92vh, 900px);
  padding: clamp(25px, 5vw, 46px);
  border-radius: 22px;
  background: #f8fbfa;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.35);
}

.kttc-modal-close {
  position: absolute;
  z-index: 3;
  top: 14px;
  right: 14px;
  display: grid;
  place-items: center;
  width: 39px;
  height: 39px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  color: var(--kttc-navy);
  background: #e8f0ef;
  font-size: 25px;
}

.kttc-teacher-login {
  max-width: 540px;
  margin: 22px auto;
  text-align: center;
}

.kttc-teacher-login > p:not(.kttc-eyebrow) {
  color: var(--kttc-muted);
}

.kttc-teacher-password {
  margin: 10px 0;
}

.kttc-teacher-submit {
  width: 100%;
}

.kttc-teacher-feedback {
  min-height: 21px;
  color: #c82d53;
  font-size: 13px;
  font-weight: 700;
}

.kttc-teacher-heading {
  padding-right: 40px;
}

.kttc-teacher-heading > p:last-child {
  color: var(--kttc-muted);
}

.kttc-teacher-card {
  margin-top: 17px;
  padding: 22px;
  border: 1px solid var(--kttc-line);
  border-radius: 15px;
  background: #fff;
  box-shadow: 0 7px 18px rgba(3, 31, 53, 0.06);
}

.kttc-teacher-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
}

.kttc-teacher-card-head span {
  color: var(--kttc-pink);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.kttc-teacher-card-head strong {
  padding: 6px 11px;
  border: 1px solid #d79a0a;
  border-radius: 8px;
  color: #604000;
  background: #fff3bf;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 15px;
  letter-spacing: 0.08em;
}

.kttc-teacher-card h3 {
  margin: 8px 0 18px;
  color: var(--kttc-navy);
  font-size: 21px;
}

.kttc-teacher-card h4 {
  margin: 16px 0 5px;
  color: var(--kttc-navy);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.kttc-teacher-card p,
.kttc-teacher-card li {
  font-size: 14px;
}

.kttc-teacher-card ul {
  padding-left: 20px;
}

.kttc-teacher-card details {
  margin-top: 15px;
  padding: 10px 12px;
  border-radius: 9px;
  background: #eef8f7;
}

.kttc-teacher-card summary {
  cursor: pointer;
  color: var(--kttc-navy);
  font-size: 13px;
  font-weight: 800;
}

.kttc-loading {
  padding: 40px;
  text-align: center;
}

body.kttc-modal-open {
  overflow: hidden;
}

@keyframes kttc-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-10px); }
  40% { transform: translateX(9px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(4px); }
}

@keyframes kttc-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(245, 72, 119, 0); }
  50% { box-shadow: 0 0 0 6px rgba(245, 72, 119, 0.14); }
}

@keyframes kttc-celebrate {
  0% { opacity: 0; transform: scale(0.2) rotate(-20deg); }
  70% { transform: scale(1.12) rotate(7deg); }
  100% { opacity: 1; transform: scale(1) rotate(0); }
}

@keyframes kttc-confetti-fall {
  0% { opacity: 1; transform: translateY(0) rotate(0); }
  100% { opacity: 0.8; transform: translateY(680px) rotate(var(--spin)); }
}

@media (max-width: 720px) {
  .kttc-app {
    margin: 10px auto;
  }

  .kttc-shell {
    min-height: 650px;
    border-radius: 17px;
  }

  .kttc-topbar {
    min-height: 67px;
    padding: 8px 13px;
  }

  .kttc-brand {
    gap: 8px;
    font-size: 14px;
  }

  .kttc-brand img {
    width: 45px;
    height: 45px;
  }

  .kttc-icon-button {
    display: none;
  }

  .kttc-teacher-link {
    padding: 6px 10px;
    font-size: 11px;
  }

  .kttc-screen {
    padding: 28px 17px;
  }

  .kttc-start-row,
  .kttc-password-row {
    flex-direction: column;
  }

  .kttc-statusbar {
    grid-template-columns: 1fr 1fr;
  }

  .kttc-statusbar > div:first-child {
    grid-column: 1 / -1;
  }

  .kttc-key-collection {
    gap: 5px;
  }

  .kttc-mini-key {
    width: 23px;
    height: 23px;
  }

  .kttc-question-content {
    padding: 24px 17px;
  }

  .kttc-background-block,
  .kttc-task-block {
    padding: 16px;
  }

  .kttc-question-content p,
  .kttc-question-content li {
    font-size: 15px;
  }

  .kttc-data-grid {
    font-size: 13px;
  }

  .kttc-unlock-panel {
    grid-template-columns: 1fr;
    padding: 21px 17px;
  }

  .kttc-lock-mechanism {
    display: none;
  }

  .kttc-modal-card {
    max-height: 95vh;
    padding: 27px 16px;
    border-radius: 17px;
  }

  .kttc-teacher-card {
    padding: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kttc-app *,
  .kttc-app *::before,
  .kttc-app *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}