/* Shared screens and feature-level layouts. */
.screen {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  padding: clamp(24px, 5vw, 72px);
  border: 1px solid #1e3039;
  background: radial-gradient(circle at 80% 10%, #132c31 0, transparent 38%), #090e12;
}

.screen > *:not(.screen-bg, .grid-horizon) { position: relative; z-index: 2; }
.learning-shell, .card-grid, .stage-list, .assessment-grid, .results-grid, .settings-grid,
.concept-list, .answer-list, .terminal, .code-window, .code-editor {
  overflow: auto;
  overscroll-behavior: contain;
}
.learning-shell { max-height: calc(100svh - 180px); }
.card-grid, .stage-list, .assessment-grid, .results-grid { max-height: calc(100svh - 250px); }
.screen-bg { position: absolute; inset: 0; z-index: 0; background-position: center; background-size: cover; opacity: 0.5; filter: saturate(0.9) contrast(1.08); }
.screen-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7, 16, 21, 0.88) 0%, rgba(7, 16, 21, 0.62) 48%, rgba(7, 16, 21, 0.12)); }
.screen-bg--home { background-image: url("../../assets/images/backgrounds/bg-home.webp"); }
.screen-bg--cases { background-image: url("../../assets/images/backgrounds/bg-cases.webp"); }
.screen-bg--guide { background-image: url("../../assets/images/backgrounds/bg-guide.webp"); }
.screen-bg--lab { background-image: url("../../assets/images/backgrounds/bg-lab-map.webp"); }
.screen-bg--stage { background-image: url("../../assets/images/backgrounds/bg-lab-room.webp"); }
.screen-bg--assessment { background-image: url("../../assets/images/backgrounds/bg-assessment.webp"); }
.screen-bg--results { background-image: url("../../assets/images/backgrounds/bg-results.webp"); }
.screen--settings { display: grid; align-content: center; }
.settings-header { margin-bottom: 32px; }
.settings-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.settings-grid { max-height: calc(100svh - 230px); overflow-x: hidden; overflow-y: auto; overscroll-behavior: contain; }
.settings-card { min-height: 310px; padding: clamp(24px, 3vw, 42px); border: 1px solid #31594e; background: linear-gradient(145deg, rgba(3,12,15,.97), rgba(7,27,28,.9)); clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%); }
.settings-card > span { color: var(--cyan); font: 9px monospace; letter-spacing: .14em; }
.settings-card h2 { margin: 14px 0 8px; font-size: clamp(28px, 3vw, 46px); }
.settings-card > p { max-width: 540px; color: var(--muted); line-height: 1.55; }
.settings-card .button { margin: 22px 8px 0 0; }
.settings-toggles { display: grid; gap: 8px; margin-top: 24px; }
.settings-toggles button { display: flex; align-items: center; justify-content: space-between; min-height: 50px; padding: 0 16px; cursor: pointer; color: var(--muted); border: 1px solid var(--line); background: #071216; }
.settings-toggles button[aria-pressed="true"] { color: var(--mint); border-color: #397360; background: rgba(10,39,34,.72); }
.settings-toggles b { font-size: 13px; letter-spacing: .08em; }
.settings-toggles span { font: 10px monospace; }
.settings-footer { margin-top: 18px; color: #5f7e75; font: 9px monospace; letter-spacing: .12em; }
.screen--home::before, .screen--cases::before, .screen--blueprint::before, .screen--lab::before, .screen--stage::before, .screen--results::before { content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none; background: center/cover no-repeat; opacity: 0.12; }
.screen--home::before { background-image: url("../../assets/images/ornaments/ornament-object-network.webp"); }
.screen--cases::before { background-image: url("../../assets/images/ornaments/ornament-terminal-lines.webp"); }
.screen--blueprint::before { background-image: url("../../assets/images/ornaments/ornament-blueprint-grid.webp"); }
.screen--lab::before { background-image: url("../../assets/images/ornaments/ornament-circuit-corner.webp"); }
.screen--stage::before { background-image: url("../../assets/images/ornaments/ornament-code-particles.webp"); }
.screen--results::before { background-image: url("../../assets/images/ornaments/ornament-success-rays.webp"); }
.cover-screen { display: grid; place-items: center; isolation: isolate; }
.cover-image { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(2, 8, 14, 0.9), rgba(2, 8, 14, 0.28)), url("../../assets/images/covers/thumbnail.jpg") center/cover; }
.cover-content { width: min(760px, 100%); margin-right: auto; padding: clamp(24px, 5vw, 64px); border-left: 3px solid var(--mint); background: linear-gradient(90deg, rgba(3, 10, 14, 0.88), transparent); }
.cover-content h1 { margin: 8px 0 18px; font: 900 clamp(50px, 9vw, 120px)/0.78 Impact, sans-serif; text-transform: uppercase; }
.cover-content h1 span { color: transparent; -webkit-text-stroke: 2px var(--mint); }
.cover-content > p:not(.eyebrow) { color: #c1d2cc; font: clamp(17px, 2vw, 24px) Georgia, serif; }

.screen::after {
  content: "OC // 0.1";
  position: absolute;
  right: 22px;
  bottom: 16px;
  color: #426056;
  font: 11px monospace;
  letter-spacing: 0.2em;
}

.screen--home { display: grid; align-content: center; gap: clamp(30px, 6vh, 68px); }
.grid-horizon { position: absolute; inset: 48% -20% -30%; transform: perspective(500px) rotateX(64deg); background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 56px 56px; mask-image: linear-gradient(to bottom, transparent, black 25%); }
.hero, .mission-grid, .mentor { position: relative; z-index: 1; }
.hero { max-width: 900px; }
.eyebrow { display: none; }
.hero h1 { margin: 0; font: 900 clamp(52px, 10vw, 144px)/0.8 Impact, Haettenschweiler, sans-serif; letter-spacing: -0.045em; }
.hero h1 span { color: transparent; -webkit-text-stroke: 2px var(--mint); text-shadow: 0 0 25px rgba(87, 242, 164, 0.28); }
.hero__subtitle { margin: 24px 0; color: #b8cbc5; font: clamp(17px, 2vw, 24px)/1.4 Georgia, serif; }

.button, .back, .text-link { border: 0; cursor: pointer; color: inherit; }
.button { min-height: 48px; padding: 0 24px; text-transform: uppercase; font-weight: 800; letter-spacing: 0.08em; }
.button--primary { color: #03150b; background: var(--mint); box-shadow: 8px 8px 0 #1a5238; }
.button--danger { margin-top: 18px; color: white; background: var(--danger); }
.button--ghost { color: var(--text); border: 1px solid var(--line); background: rgba(7, 12, 15, 0.75); }
.button:disabled { cursor: not-allowed; opacity: 0.42; box-shadow: none; }
.back, .text-link { padding: 8px 0; color: var(--mint); background: none; font: 700 13px monospace; }

.mission-grid, .card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.mission, .panel { min-height: 150px; padding: 22px; text-align: left; color: var(--text); border: 1px solid var(--line); background: var(--panel); }
.mission { position: relative; display: grid; gap: 6px; cursor: pointer; transition: transform 160ms, border-color 160ms; }
.mission img { position: absolute; right: 12px; top: 12px; width: 88px; height: 88px; object-fit: contain; opacity: 0.82; }
.mission small, .mission strong, .mission span { max-width: calc(100% - 80px); }
.mission:hover { transform: translateY(-6px); }
.mission small, .stage small { color: var(--muted); }
.mission strong { font-size: clamp(20px, 2vw, 28px); }
.mission--danger { border-top: 3px solid var(--danger); }
.mission--blue { border-top: 3px solid var(--cyan); }
.mission--green { border-top: 3px solid var(--mint); }
.mentor { margin: 0; color: var(--muted); font: 13px/1.5 monospace; }
.mentor b { color: var(--violet); }
.mentor-card { position: absolute !important; right: 3%; bottom: 0; display: flex; align-items: end; max-width: 430px; }
.mentor-card img { width: 180px; max-height: 240px; object-fit: contain; object-position: bottom; filter: drop-shadow(0 0 18px rgba(89, 217, 255, 0.28)); }
.mentor-card .mentor { margin-bottom: 28px; padding: 14px; border: 1px solid #4d756a; background: rgba(5, 12, 15, 0.91); }

.page-header { max-width: 850px; margin-bottom: clamp(36px, 7vh, 72px); }
.page-header h1 { margin: 8px 0; font: 800 clamp(36px, 6vw, 78px)/0.95 Georgia, serif; letter-spacing: -0.04em; }
.page-header > p:last-child { color: var(--muted); }
.panel h2 { margin: 10px 0; }
.panel p { color: var(--muted); line-height: 1.55; }
.panel-icon { float: right; width: 92px; height: 92px; object-fit: contain; }
.case-card { cursor: pointer; }
.case-card__icon { float: right; width: 100px; height: 100px; object-fit: contain; }
.case-card:hover, .case-card.is-selected { border-color: var(--danger); box-shadow: inset 0 0 30px rgba(255, 101, 79, 0.08); }
.case-card .text-link { display: block; margin-top: 16px; }
.terminal { margin-top: 24px; padding: 18px; border-left: 3px solid var(--danger); color: #a8b9b4; background: #030506; font: 13px monospace; }
.terminal span { color: var(--danger); }
.screen--blueprint { background-color: #071728; background-image: linear-gradient(rgba(89, 217, 255, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(89, 217, 255, 0.05) 1px, transparent 1px); background-size: 28px 28px; }
.rule-number { color: var(--cyan); font: 700 24px monospace; }
.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab { min-height: 42px; padding: 0 18px; cursor: pointer; color: var(--muted); border: 1px solid var(--line); background: #09141d; }
.tab.is-active { color: #052016; border-color: var(--mint); background: var(--mint); }
.panel pre { overflow: auto; color: var(--mint); }
.mentor-strip { display: flex; align-items: center; max-width: 850px; min-height: 86px; margin-top: 24px; padding: 10px 18px 10px 92px; border: 1px solid #335e50; background: rgba(6, 15, 18, 0.92); }
.mentor-strip img { position: absolute; left: 4px; bottom: 0; width: 86px; height: 112px; object-fit: contain; object-position: bottom; }
.mentor-strip p { margin: 0; color: var(--muted); font: 12px/1.5 monospace; }
.mentor-strip b { color: var(--mint); }

.stage-list { display: grid; gap: 12px; max-width: 980px; }
.stage { display: grid; grid-template-columns: 54px 44px 1fr 42px auto; align-items: center; gap: 12px; width: 100%; padding: 12px 18px; text-align: left; color: var(--text); border: 1px solid var(--line); background: rgba(8, 15, 19, 0.9); }
.stage:not(:disabled) { cursor: pointer; }
.stage:not(:disabled):hover { border-color: var(--mint); transform: translateX(6px); }
.stage__icon { width: 54px; height: 54px; object-fit: contain; }
.stage__lock { width: 42px; height: 42px; object-fit: contain; }
.stage__id { color: var(--mint); font: 700 22px monospace; }
.stage strong, .stage small { display: block; }
.stage b { color: var(--mint); font: 11px monospace; }
.stage.is-locked { cursor: not-allowed; opacity: 0.42; }
.status-panel { display: flex; justify-content: space-between; max-width: 980px; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font: 12px monospace; }
.status-panel strong { color: var(--mint); }
.assessment-cta { margin-top: 20px; }
.lab-header { display: block; max-width: none; margin-bottom: 30px; }
.lab-header__copy { max-width: 900px; }
.lab-header__copy h1 { font-size: clamp(40px, 5vw, 68px); }
.lab-header__copy > p { color: var(--muted); }
.screen--lab .stage-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; width: 100%; max-width: none; }
.screen--lab .stage { position: relative; grid-template-columns: 64px 50px minmax(0, 1fr) auto; grid-template-rows: 1fr 1fr; min-height: 128px; padding: 18px 20px; overflow: hidden; background: linear-gradient(135deg, rgba(5,17,20,.97), rgba(7,27,27,.88)); }
.screen--lab .stage__icon { grid-row: 1 / 3; width: 64px; height: 64px; }
.screen--lab .stage__id { grid-row: 1 / 3; font-size: 26px; }
.screen--lab .stage > span:not(.stage__id) { grid-row: 1 / 3; }
.screen--lab .stage strong { font-size: 19px; }
.screen--lab .stage__lock { grid-column: 4; grid-row: 1; justify-self: end; }
.screen--lab .stage > b { grid-column: 4; grid-row: 2; align-self: end; justify-self: end; }
.screen--lab .stage:not(:disabled):hover { transform: none; box-shadow: inset 4px 0 0 var(--mint), 0 16px 34px rgba(0,0,0,.34); }
.screen--lab .stage.is-locked { opacity: .5; }
.lab-footer { display: flex; align-items: center; justify-content: space-between; min-height: 54px; margin-top: 18px; padding-top: 14px; color: #66837a; border-top: 1px solid #2b4942; font: 10px monospace; letter-spacing: .08em; }
.lab-footer strong { color: var(--mint); }
.empty-state { max-width: 720px; margin: 10vh auto; padding: 40px; text-align: center; border: 1px dashed var(--line); color: var(--muted); background: rgba(4, 10, 13, 0.86); }
.empty-state strong { color: var(--text); font-size: 24px; }
.empty-state img { display: block; width: 130px; height: 130px; margin: 0 auto; object-fit: contain; }

.compact-header, .assessment-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 28px; color: var(--muted); font: 11px monospace; letter-spacing: 0.14em; }
.stage-header { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; margin-bottom: 14px; }
.stage-header__location { display: grid; justify-items: start; }
.stage-header__location .back { padding: 3px 0; }
.stage-header__title { color: var(--text); font: 700 clamp(20px, 2.1vw, 48px) "Funnel Display", sans-serif; letter-spacing: -.02em; text-align: center; }
.stage-header > .listen-button { justify-self: end; margin-top: 0; }
.stage-corner-status { position: absolute !important; left: clamp(24px, 5vw, 72px); bottom: 16px; z-index: 5 !important; color: #5f8278; font: 9px monospace; letter-spacing: .14em; text-transform: uppercase; }
.stage-workbench { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr); gap: 18px; }
.lesson-panel, .challenge-panel, .scenario-card, .answer-card, .analytics-card, .score-card { padding: clamp(20px, 3vw, 36px); border: 1px solid var(--line); background: rgba(6, 13, 17, 0.94); box-shadow: 0 18px 60px rgba(0, 0, 0, 0.28); }
.lesson-panel h1 { margin: 6px 0 14px; font: 700 clamp(34px, 5vw, 62px)/0.95 Georgia, serif; }
.lesson-panel > p:not(.eyebrow) { color: #b9cac5; line-height: 1.55; }
.lesson-icon { float: right; width: 130px; height: 130px; object-fit: contain; }
.concept-icons { display: flex; float: right; clear: right; gap: 4px; margin-top: -20px; }
.concept-icons img { width: 48px; height: 48px; object-fit: contain; }
.actor-lineup { display: flex; align-items: end; justify-content: center; min-height: 150px; margin: 12px 0; overflow: hidden; border-bottom: 1px solid #285245; background: radial-gradient(ellipse at bottom, rgba(87, 242, 164, 0.16), transparent 60%); }
.actor-lineup img { width: min(31%, 140px); height: 150px; object-fit: contain; object-position: bottom; filter: drop-shadow(0 8px 10px rgba(0, 0, 0, 0.7)); }
.code-window { margin: 22px 0 0; padding: 22px; overflow: auto; color: #8efac1; border: 1px solid #254b3d; border-radius: 3px; background: #020706; font: 13px/1.65 Consolas, monospace; white-space: pre-wrap; }
.choices, .answer-list { display: grid; gap: 10px; }
.choice, .answer-option { display: grid; grid-template-columns: 34px 1fr; align-items: center; gap: 12px; width: 100%; min-height: 58px; padding: 10px 14px; cursor: pointer; text-align: left; color: var(--text); border: 1px solid var(--line); background: #0a1419; }
.choice b, .answer-option b { display: grid; width: 30px; height: 30px; place-items: center; color: var(--cyan); border: 1px solid #335b67; font: 700 12px monospace; }
.choice:hover, .answer-option:hover, .answer-option.is-selected { border-color: var(--cyan); background: rgba(20, 65, 76, 0.42); }
.choice.is-correct { border-color: var(--mint); }
.choice.is-wrong { border-color: var(--danger); }
.choice[draggable="true"] { cursor: grab; }
.choice[draggable="true"]:active { cursor: grabbing; }
.drop-zone { margin-top: 12px; padding: 15px; text-align: center; color: var(--muted); border: 1px dashed #3a7562; background: rgba(87, 242, 164, 0.035); font: 11px/1.4 monospace; }
.drop-zone:hover { color: var(--mint); border-color: var(--mint); }
.compiler-feedback { display: grid; grid-template-columns: 62px 1fr; align-items: center; gap: 12px; margin: 16px 0; padding: 12px; border-left: 3px solid; background: #07100e; }
.compiler-feedback img { width: 62px; height: 62px; object-fit: contain; }
.compiler-feedback p { margin: 0; line-height: 1.45; }
.compiler-feedback.is-success { color: #bafbd9; border-color: var(--mint); }
.compiler-feedback.is-error { color: #ffc1b8; border-color: var(--danger); }
.hint { color: var(--muted); font: 12px/1.5 monospace; }