:root {
  --ink: #050505;
  --paper: #fbfaf2;
  --paper-soft: #f1efe4;
  --muted: #565650;
  --rule: #111;
  --danger: #111;
  font-family:
    "Courier New", "Lucida Console", Monaco, Consolas, ui-monospace, monospace;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.42;
  font-synthesis: none;
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: none;
  -moz-osx-font-smoothing: grayscale;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    repeating-linear-gradient(
      0deg,
      rgba(0, 0, 0, 0.025) 0,
      rgba(0, 0, 0, 0.025) 1px,
      transparent 1px,
      transparent 7px
    ),
    radial-gradient(circle at 50% 10%, rgba(0, 0, 0, 0.035), transparent 36rem),
    var(--paper);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: 0.42;
  background-image:
    radial-gradient(rgba(0, 0, 0, 0.12) 0.55px, transparent 0.75px);
  background-size: 5px 5px;
}

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--rule);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 50;
  padding: 0.5rem 0.75rem;
  color: #fff;
  background: #000;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.access-screen,
.course-portal {
  width: min(1380px, calc(100% - 1.5rem));
  margin: 0 auto;
}

.access-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 0.75rem 0;
}

body[data-page="access"] {
  overflow: hidden;
}

body[data-page="access"] .access-screen {
  width: min(1380px, calc(100% - 1rem));
  height: 100svh;
  min-height: 0;
  padding: 0.5rem 0;
}

.terminal-shell,
.course-portal,
.lesson-modal {
  border: 2px solid var(--rule);
  background: rgba(251, 250, 242, 0.96);
  box-shadow:
    1px 0 0 rgba(0, 0, 0, 0.4),
    -1px 0 0 rgba(0, 0, 0, 0.18);
}

.terminal-shell {
  width: 100%;
  min-height: calc(100vh - 1.5rem);
  padding: clamp(1rem, 3vw, 2.8rem);
}

body[data-page="access"] .terminal-shell {
  height: calc(100svh - 1rem);
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: clamp(0.75rem, 2.1vh, 2rem) clamp(1rem, 2.4vw, 2.4rem);
}

.site-strip,
.portal-strip {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 2px dashed var(--rule);
  padding-bottom: 0.95rem;
  font-size: clamp(1rem, 1.55vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

body[data-page="access"] .site-strip {
  padding-bottom: clamp(0.45rem, 1.2vh, 0.8rem);
  font-size: clamp(0.9rem, 1.9vh, 1.25rem);
}

.chronological-check {
  width: min(1120px, 100%);
  margin: clamp(2.5rem, 5vw, 4.4rem) auto 0;
}

body[data-page="access"] .chronological-check {
  flex: 1;
  width: min(1100px, 100%);
  min-height: 0;
  display: grid;
  align-content: space-between;
  margin: clamp(0.75rem, 2.2vh, 1.8rem) auto 0;
}

.check-intro h1,
.course-hero h1,
.portal-section h2,
.lesson-modal h2 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4.2vw, 4.3rem);
  line-height: 1.03;
  letter-spacing: -0.035em;
  text-transform: uppercase;
}

body[data-page="access"] .check-intro h1 {
  margin-bottom: clamp(0.35rem, 0.9vh, 0.7rem);
  font-size: clamp(1.7rem, 4.8vh, 3.75rem);
}

.check-intro p {
  margin: 0;
  font-size: clamp(1rem, 1.65vw, 1.32rem);
  font-weight: 700;
}

body[data-page="access"] .check-intro p {
  font-size: clamp(0.9rem, 2vh, 1.2rem);
}

.clock-block {
  margin: clamp(2.5rem, 5.8vw, 4.2rem) auto 1.9rem;
  text-align: center;
}

body[data-page="access"] .clock-block {
  margin: clamp(0.65rem, 2vh, 1.6rem) auto clamp(0.5rem, 1.6vh, 1.1rem);
}

.clock-block h2,
.section-label {
  margin: 0 0 0.6rem;
  font-size: clamp(0.95rem, 1.65vw, 1.28rem);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

body[data-page="access"] .clock-block h2 {
  margin-bottom: clamp(0.25rem, 0.8vh, 0.5rem);
  font-size: clamp(0.82rem, 1.8vh, 1.12rem);
}

.device-date,
.device-clock,
.record-hint,
.system-output,
.status-grid {
  font-weight: 700;
}

.device-date {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.08em;
  margin: 0;
  font-size: clamp(2.2rem, 5.4vw, 4.8rem);
  letter-spacing: 0.04em;
}

body[data-page="access"] .device-date {
  font-size: clamp(1.8rem, 5.8vh, 4rem);
}

.device-clock {
  margin: 0.1rem 0 0;
  font-size: clamp(3.7rem, 9.4vw, 8.8rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

body[data-page="access"] .device-clock {
  font-size: clamp(3rem, 12vh, 7.5rem);
}

.editable-year {
  position: relative;
  border: 0;
  border-bottom: 0.08em solid var(--rule);
  color: var(--ink);
  background: transparent;
  padding: 0 0.08em;
  font-weight: 700;
  letter-spacing: inherit;
  cursor: grab;
}

.editable-year::before {
  content: "[";
}

.editable-year::after {
  content: "]";
}

.editable-year:hover,
.editable-year:focus-visible,
.editable-year.is-editing {
  color: #fff;
  background: #000;
  text-shadow: 1px 0 0 #fff;
}

.editable-year:active {
  cursor: grabbing;
}

.year-input {
  width: 4.8ch;
  border: 0;
  color: #fff;
  background: #000;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
}

.record-hint {
  min-height: 1.5rem;
  margin: 1rem 0 0;
  font-size: clamp(0.95rem, 1.55vw, 1.15rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

body[data-page="access"] .record-hint {
  min-height: 1.15rem;
  margin-top: clamp(0.35rem, 1vh, 0.75rem);
  font-size: clamp(0.78rem, 1.65vh, 1rem);
}

.status-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: min(1040px, 100%);
  margin: 0 auto;
  padding: 1.2rem 2.2rem;
  border-top: 2px dashed var(--rule);
  border-bottom: 2px dashed var(--rule);
  font-size: clamp(0.92rem, 1.32vw, 1.08rem);
  letter-spacing: 0.06em;
}

body[data-page="access"] .status-grid {
  padding: clamp(0.55rem, 1.5vh, 0.95rem) clamp(0.85rem, 2vw, 1.8rem);
  font-size: clamp(0.78rem, 1.55vh, 0.98rem);
}

.status-grid div {
  display: grid;
  grid-template-columns: minmax(12rem, 1fr) 1fr;
  gap: 1rem;
  align-items: center;
  padding: 0.25rem 0;
}

body[data-page="access"] .status-grid div {
  padding: clamp(0.12rem, 0.42vh, 0.25rem) 0;
}

.status-grid div:nth-child(odd) {
  border-right: 2px solid var(--rule);
  padding-right: 2rem;
}

.status-grid div:nth-child(even) {
  padding-left: 2rem;
}

.status-grid span::after,
.metadata-panel dt::after {
  content: " :";
}

.redaction-bar {
  display: inline-block;
  width: min(17ch, 100%);
  height: 1.1em;
  background: #000;
  vertical-align: text-bottom;
}

.system-output {
  width: min(1040px, 100%);
  min-height: 7.8rem;
  margin: 1.35rem auto 0;
  padding: 1rem;
  border: 2px solid var(--rule);
  background: var(--paper-soft);
  font-size: clamp(0.95rem, 1.45vw, 1.15rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

body[data-page="access"] .system-output {
  min-height: clamp(5.1rem, 11vh, 6.8rem);
  margin-top: clamp(0.55rem, 1.5vh, 1rem);
  padding: clamp(0.55rem, 1.35vh, 0.9rem);
  font-size: clamp(0.78rem, 1.55vh, 1rem);
}

.system-output p {
  margin: 0.15rem 0;
}

.enter-course,
.observer-form button,
.lesson-modal button {
  border: 2px solid var(--rule);
  color: var(--ink);
  background: #fff;
  padding: 0.8rem 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
}

.enter-course {
  display: block;
  width: min(1040px, 100%);
  margin: 1rem auto 0;
  text-align: center;
}

body[data-page="access"] .enter-course {
  margin-top: clamp(0.45rem, 1.2vh, 0.8rem);
  padding: clamp(0.55rem, 1.35vh, 0.8rem) 1rem;
}

.enter-course:hover,
.observer-form button:hover,
.lesson-modal button:hover,
.lesson-card:hover {
  color: #fff;
  background: #000;
}

.lesson-card-locked {
  background:
    repeating-linear-gradient(
      -45deg,
      transparent 0,
      transparent 9px,
      rgba(0, 0, 0, 0.055) 9px,
      rgba(0, 0, 0, 0.055) 18px
    ),
    #fff;
}

.lesson-card-locked:hover {
  color: var(--ink);
  background:
    repeating-linear-gradient(
      -45deg,
      transparent 0,
      transparent 9px,
      rgba(0, 0, 0, 0.11) 9px,
      rgba(0, 0, 0, 0.11) 18px
    ),
    #fff;
}

.course-portal {
  margin-bottom: 1rem;
  padding: clamp(1rem, 3vw, 2.4rem);
}

.portal-strip {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--paper);
}

.blocked-shell {
  width: 100%;
}

.return-link {
  display: inline-block;
  width: auto;
  margin-inline: 0;
}

.portal-strip nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.5rem 1rem;
  font-size: clamp(0.78rem, 1.15vw, 0.95rem);
  letter-spacing: 0.04em;
}

.portal-strip a {
  text-decoration: none;
}

.portal-strip a:hover {
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

.course-nav {
  position: sticky;
  top: 4.6rem;
  z-index: 9;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding: 1rem 0;
  border-bottom: 2px dashed var(--rule);
  background: var(--paper);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.course-nav a {
  text-decoration: none;
}

.course-nav a:hover {
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

.portal-section {
  padding: clamp(2rem, 4.2vw, 3.4rem) 0;
  border-bottom: 2px solid var(--rule);
  scroll-margin-top: 7rem;
}

.portal-section p {
  max-width: 78ch;
  font-weight: 700;
}

.notice-section,
.observer-section {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.75fr);
  gap: 2rem;
}

.subtitle {
  font-size: 1.1rem;
}

.metadata-panel,
.lesson-card,
.observer-form {
  border: 2px solid var(--rule);
  background: #fff;
}

.metadata-panel {
  padding: 1rem;
}

.metadata-panel dl {
  margin: 0;
}

.metadata-panel div {
  display: grid;
  grid-template-columns: minmax(12rem, 0.95fr) 1fr;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 2px solid var(--rule);
}

.metadata-panel div:last-child {
  border-bottom: 0;
}

.metadata-panel dt,
.metadata-panel dd {
  margin: 0;
  font-weight: 700;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.lesson-card {
  min-height: 235px;
  display: grid;
  align-content: start;
  gap: 0.75rem;
  padding: 1rem;
  color: var(--ink);
  text-align: left;
}

.lesson-card h3 {
  margin: 0;
  font-size: 1.18rem;
  line-height: 1.18;
  text-transform: uppercase;
}

.lesson-card p {
  margin: 0;
}

.module-code,
.lesson-status,
.modal-note,
.form-message,
.hidden-fragment {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.module-code {
  border-bottom: 2px solid var(--rule);
  padding-bottom: 0.5rem;
}

.lesson-status {
  align-self: end;
  margin-top: 0.75rem;
  font-size: 0.85rem;
}

.log-list {
  display: grid;
  gap: 0.6rem;
  margin: 1rem 0 0;
  padding-left: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.observer-form {
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.observer-form label {
  display: grid;
  gap: 0.35rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.observer-form input,
.observer-form textarea {
  width: 100%;
  border: 2px solid var(--rule);
  color: var(--ink);
  background: #fff;
  padding: 0.75rem;
}

.observer-form textarea {
  resize: vertical;
}

.checkbox-row {
  grid-template-columns: auto 1fr;
  align-items: start;
  text-transform: none;
}

.checkbox-row input {
  width: auto;
  margin-top: 0.25rem;
}

.observer-form button {
  justify-self: start;
}

.form-message {
  min-height: 1.4rem;
  margin: 0;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-top: 2rem;
}

.site-footer div {
  display: grid;
  gap: 0.3rem;
}

.hidden-fragment {
  max-width: 20rem;
  margin: 0;
  color: rgba(0, 0, 0, 0.28);
  font-size: 0.72rem;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(251, 250, 242, 0.82);
}

.lesson-modal {
  width: min(640px, 100%);
  padding: 1.2rem;
  box-shadow: 8px 8px 0 #000;
}

.lesson-modal h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.7rem);
}

.modal-note {
  margin-top: 1rem;
}

@media (max-width: 980px) {
  .status-grid,
  .notice-section,
  .observer-section {
    grid-template-columns: 1fr;
  }

  .status-grid div:nth-child(odd),
  .status-grid div:nth-child(even) {
    border-right: 0;
    padding-left: 0;
    padding-right: 0;
  }

  .lesson-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  body {
    overflow-x: hidden;
  }

  body[data-page="access"] {
    overflow: auto;
  }

  .access-screen,
  .course-portal {
    width: min(100% - 0.75rem, 1380px);
  }

  body[data-page="access"] .access-screen {
    width: min(100% - 0.75rem, 1380px);
    height: auto;
    min-height: 100svh;
    padding: 0.35rem 0;
  }

  .terminal-shell {
    min-height: auto;
  }

  body[data-page="access"] .terminal-shell {
    height: auto;
    min-height: calc(100svh - 0.7rem);
    overflow: visible;
    padding: 0.75rem;
  }

  .site-strip,
  .portal-strip,
  .site-footer {
    display: grid;
    justify-content: stretch;
    gap: 0.35rem;
    font-size: clamp(0.78rem, 3.7vw, 1rem);
    letter-spacing: 0.08em;
  }

  body[data-page="access"] .chronological-check {
    display: block;
    margin-top: 1rem;
  }

  body[data-page="access"] .check-intro h1 {
    font-size: clamp(1.75rem, 10vw, 2.65rem);
    line-height: 0.98;
    overflow-wrap: anywhere;
  }

  body[data-page="access"] .check-intro p {
    font-size: clamp(0.9rem, 4.2vw, 1.05rem);
  }

  body[data-page="access"] .clock-block {
    margin: 1.25rem auto 0.9rem;
  }

  .status-grid {
    padding: 1rem 0;
  }

  body[data-page="access"] .status-grid {
    padding: 0.75rem 0;
    font-size: clamp(0.72rem, 3.4vw, 0.9rem);
    letter-spacing: 0.035em;
  }

  .status-grid div {
    grid-template-columns: 1fr;
    gap: 0.15rem;
    border-bottom: 1px solid var(--rule);
  }

  .status-grid div:last-child {
    border-bottom: 0;
  }

  .status-grid span::after,
  .metadata-panel dt::after {
    content: "";
  }

  .device-date {
    display: flex;
    flex-wrap: wrap;
    gap: 0.02em;
    font-size: clamp(1.55rem, 9vw, 2.65rem);
    letter-spacing: 0.015em;
    line-height: 1.08;
  }

  .device-clock {
    font-size: clamp(2.85rem, 18vw, 4.9rem);
    letter-spacing: -0.075em;
  }

  body[data-page="access"] .device-date {
    font-size: clamp(1.55rem, 9vw, 2.65rem);
  }

  body[data-page="access"] .device-clock {
    font-size: clamp(2.85rem, 18vw, 4.9rem);
  }

  body[data-page="access"] .record-hint {
    font-size: clamp(0.7rem, 3.3vw, 0.9rem);
    letter-spacing: 0.06em;
  }

  body[data-page="access"] .system-output {
    min-height: 0;
    margin-top: 0.85rem;
    font-size: clamp(0.72rem, 3.35vw, 0.9rem);
    letter-spacing: 0.04em;
  }

  body[data-page="access"] .enter-course {
    margin-top: 0.75rem;
  }

  .course-portal {
    padding: 0.8rem;
  }

  .course-nav {
    position: static;
    gap: 0.4rem 0.8rem;
    font-size: 0.85rem;
  }

  .portal-section {
    padding: 1.6rem 0;
    scroll-margin-top: 1rem;
  }

  .portal-section p,
  .check-intro p {
    overflow-wrap: anywhere;
  }

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

  .metadata-panel div {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .observer-form {
    padding: 0.8rem;
  }

  .observer-form input,
  .observer-form textarea {
    padding: 0.65rem;
    font-size: 16px;
  }

  .checkbox-row {
    grid-template-columns: 1.25rem 1fr;
  }

  .lesson-modal {
    max-height: calc(100svh - 2rem);
    overflow: auto;
    box-shadow: 5px 5px 0 #000;
  }
}

@media (max-width: 390px) {
  body[data-page="access"] .terminal-shell {
    padding: 0.6rem;
  }

  body[data-page="access"] .check-intro h1 {
    font-size: clamp(1.45rem, 9.2vw, 2.15rem);
  }

  body[data-page="access"] .device-date {
    font-size: clamp(1.35rem, 8.2vw, 2.2rem);
  }

  body[data-page="access"] .device-clock {
    font-size: clamp(2.45rem, 16vw, 4.1rem);
  }

  body[data-page="access"] .status-grid {
    font-size: clamp(0.66rem, 3.2vw, 0.82rem);
  }
}