@import "https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=DM+Sans:wght@400;500;700&family=Playfair+Display:ital,wght@0,600;1,600&display=swap";

/* src/styles.css */
:root {
  --paper: #efe9dc;
  --paper-light: #f8f5ed;
  --ink: #182421;
  --muted: #6f7972;
  --teal: #126b62;
  --teal-dark: #0d514c;
  --line: #18242129;
  --orange: #d86f47;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  font-family: DM Sans, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  min-width: 320px;
  margin: 0;
}

button, select, input {
  font: inherit;
}

button, a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
}

.section-shell {
  width: min(1160px, 100% - 64px);
  margin: 0 auto;
}

.app-shell {
  overflow: hidden;
}

.topbar {
  display: flex;
  border-bottom: 1px solid var(--line);
  justify-content: space-between;
  align-items:  center;
  min-height: 92px;
}

.wordmark {
  display: inline-flex;
  letter-spacing: -.04em;
  align-items: baseline;
  gap: 9px;
  font-family: DM Mono, monospace;
  font-size: 1.1rem;
  font-weight: 500;
}

.wordmark small, .progress-chip small {
  color: var(--muted);
  letter-spacing: .07em;
  text-transform: uppercase;
  font-family: DM Mono, monospace;
  font-size: .64rem;
}

.topbar nav {
  display: flex;
  color: var(--muted);
  letter-spacing: .08em;
  text-transform: uppercase;
  gap: 29px;
  font-family: DM Mono, monospace;
  font-size: .68rem;
}

.topbar nav a:hover, .text-button:hover {
  color: var(--teal);
}

.progress-chip {
  display: flex;
  align-items:  center;
  gap: 9px;
  font-family: DM Mono, monospace;
  font-size: .74rem;
}

.progress-chip span {
  color: var(--teal);
  font-weight: 500;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  align-items:  center;
  gap: 50px;
  min-height: 635px;
  padding: 74px 0 98px;
}

.eyebrow {
  color: var(--teal);
  letter-spacing: .13em;
  text-transform: uppercase;
  margin: 0 0 20px;
  font-family: DM Mono, monospace;
  font-size: .68rem;
}

h1, h2, h3, p {
  margin-top: 0;
}

h1, h2 {
  letter-spacing: -.065em;
}

h1 {
  max-width: 690px;
  margin-bottom: 28px;
  font-size: clamp(3.4rem, 8vw, 6.8rem);
  font-weight: 500;
  line-height: .92;
}

h1 em, h2 em {
  color: var(--teal);
  font-family: Playfair Display, serif;
  font-weight: 600;
}

.hero-intro {
  color: var(--muted);
  max-width: 415px;
  margin-bottom: 33px;
  font-size: 1.04rem;
  line-height: 1.6;
}

.primary-link {
  display: inline-flex;
  border-bottom: 1px solid var(--teal);
  color: var(--teal);
  letter-spacing: .05em;
  text-transform: uppercase;
  align-items:  center;
  gap: 20px;
  padding-bottom: 9px;
  font-family: DM Mono, monospace;
  font-size: .72rem;
}

.primary-link span {
  transition: transform .2s;
  font-size: 1.1rem;
}

.primary-link:hover span {
  transform: translateY(4px);
}

.camera-sketch {
  position: relative;
  width: min(410px, 86vw);
  height: 285px;
  margin: 0 auto;
  transform: rotate(-4deg);
}

.camera-body {
  position: absolute;
  border: 2px solid var(--ink);
  background: var(--teal);
  box-shadow: 13px 15px 0 var(--ink);
  border-radius: 20px 18px 27px 22px;
  width: 83%;
  height: 185px;
  bottom: 34px;
  right: 5%;
}

.camera-top {
  position: absolute;
  border: 2px solid var(--ink);
  background: var(--teal);
  z-index: 1;
  border-bottom: 0;
  border-radius: 18px 15px 0 0;
  width: 30%;
  height: 51px;
  top: 35px;
  left: 13%;
}

.camera-top span {
  position: absolute;
  color: var(--paper);
  letter-spacing: .1em;
  font-family: DM Mono, monospace;
  font-size: .54rem;
  top: 12px;
  left: 16px;
}

.viewfinder {
  position: absolute;
  border: 2px solid var(--ink);
  background: var(--paper);
  border-radius: 6px;
  width: 46px;
  height: 26px;
  top: 19px;
  left: 40%;
}

.lens {
  position: absolute;
  border: 2px solid var(--ink);
  background: var(--orange);
  box-shadow: inset 0 0 0 16px var(--teal-dark), inset 0 0 0 19px var(--ink);
  border-radius: 50%;
  width: 137px;
  height: 137px;
  top: 21px;
  right: 13%;
}

.lens i {
  position: absolute;
  border: 2px solid var(--ink);
  background: #172c2b;
  border-radius: 50%;
  inset: 37px;
}

.lens b {
  position: absolute;
  background: #f1b27b;
  border-radius: 50%;
  width: 14px;
  height: 24px;
  top: 28px;
  left: 29px;
  transform: rotate(35deg);
}

.camera-mark {
  position: absolute;
  color: var(--paper);
  letter-spacing: .12em;
  font-family: DM Mono, monospace;
  font-size: .65rem;
  bottom: 19px;
  left: 17%;
}

.camera-shadow {
  position: absolute;
  filter: blur(7px);
  z-index: -1;
  background: #1824212e;
  border-radius: 50%;
  width: 74%;
  height: 32px;
  bottom: 8px;
  left: 11%;
}

.camera-tour {
  border-top: 1px solid var(--line);
  padding: 110px 0 104px;
}

.camera-tour-heading {
  display: flex;
  justify-content: space-between;
  align-items:  flex-end;
  gap: 40px;
  margin-bottom: 46px;
}

.camera-tour-heading h2 {
  margin-bottom: 0;
}

.camera-view-switch {
  display: flex;
  border-bottom: 1px solid var(--line);
}

.camera-view-switch button {
  color: var(--muted);
  cursor: pointer;
  letter-spacing: .06em;
  text-transform: uppercase;
  background: none;
  border: 0;
  border-bottom: 2px solid #0000;
  padding: 10px 15px;
  font-family: DM Mono, monospace;
  font-size: .64rem;
}

.camera-view-switch button:hover, .camera-view-switch button.is-active {
  border-bottom-color: var(--teal);
  color: var(--teal);
}

.camera-tour-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, .65fr);
  align-items: stretch;
  gap: 40px;
}

.camera-stage {
  position: relative;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #f8f5ed59;
  min-width: 0;
}

.camera-diagram {
  display: block;
  width: 100%;
  height: auto;
}

.camera-part-shape {
  transition: filter .2s, opacity .2s, stroke .2s;
}

.camera-part-shape.is-active {
  filter: drop-shadow(0 0 9px #d86f47d9);
  stroke: var(--orange);
}

.camera-hotspot {
  position: absolute;
  display: grid;
  border: 2px solid var(--paper-light);
  color: var(--paper-light);
  background: var(--teal);
  cursor: pointer;
  border-radius: 50%;
  place-items:  center;
  width: 34px;
  height: 34px;
  padding: 0;
  transition: transform .18s, background .18s;
  font-family: DM Mono, monospace;
  font-size: .62rem;
  transform: translate(-50%, -50%);
  box-shadow: 0 3px #0b161342;
}

.camera-hotspot:hover, .camera-hotspot.is-active {
  background: var(--orange);
  outline: none;
  transform: translate(-50%, -50%)scale(1.13);
}

.camera-hotspot:focus-visible {
  background: var(--orange);
  outline: none;
  transform: translate(-50%, -50%)scale(1.13);
}

.camera-part-card {
  display: flex;
  border-top: 1px solid var(--teal);
  flex-direction: column;
  padding: 31px 0 0;
}

.camera-part-card > span {
  color: var(--orange);
  letter-spacing: .08em;
  font-family: DM Mono, monospace;
  font-size: .66rem;
}

.camera-part-card h3 {
  letter-spacing: -.035em;
  margin: 23px 0 13px;
  font-family: Playfair Display, serif;
  font-size: 2rem;
  font-weight: 600;
}

.camera-part-card > p {
  color: var(--muted);
  line-height: 1.6;
}

.camera-part-card > div {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 12px 0 25px;
  padding: 17px 0;
}

.camera-part-card small {
  color: var(--teal);
  letter-spacing: .09em;
  text-transform: uppercase;
  font-family: DM Mono, monospace;
  font-size: .61rem;
}

.camera-part-card > div p {
  margin: 8px 0 0;
  font-size: .9rem;
  line-height: 1.5;
}

.camera-part-card nav {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: auto;
  padding-bottom: 7px;
}

.camera-part-card nav button {
  border: 1px solid var(--line);
  color: var(--muted);
  cursor: pointer;
  text-transform: uppercase;
  background: none;
  padding: 6px 8px;
  font-family: DM Mono, monospace;
  font-size: .57rem;
}

.camera-part-card nav button:hover, .camera-part-card nav button.is-active {
  border-color: var(--teal);
  color: var(--teal);
}

.camera-source {
  color: var(--muted);
  letter-spacing: .03em;
  text-transform: uppercase;
  margin: 17px 0 0;
  font-family: DM Mono, monospace;
  font-size: .59rem;
}

.camera-source a {
  color: var(--teal);
}

.guide {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  border-top: 1px solid var(--line);
  gap: 80px;
  padding: 115px 0;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 500;
  line-height: .98;
}

.guide-intro > p:not(.eyebrow) {
  color: var(--muted);
  max-width: 300px;
  line-height: 1.6;
}

.guide-intro small {
  display: block;
  color: var(--muted);
  text-transform: uppercase;
  margin-top: 12px;
  font-family: DM Mono, monospace;
  font-size: .65rem;
}

.progress-line {
  background: #126b6226;
  width: 100%;
  max-width: 290px;
  height: 4px;
  margin-top: 38px;
}

.progress-line span {
  display: block;
  background: var(--teal);
  height: 100%;
  transition: width .3s;
}

.lesson-tabs {
  border-bottom: 1px solid var(--line);
  padding-bottom: 30px;
}

.lesson-tabs > div {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.lesson-tabs button {
  display: flex;
  color: var(--muted);
  cursor: pointer;
  letter-spacing: .03em;
  text-transform: uppercase;
  background: none;
  border: 1px solid #0000;
  align-items:  center;
  gap: 9px;
  padding: 8px 11px;
  font-family: DM Mono, monospace;
  font-size: .64rem;
}

.lesson-tabs button span {
  color: var(--teal);
}

.lesson-tabs button b {
  color: var(--teal);
  font-size: .9rem;
  font-weight: 400;
}

.lesson-tabs button:hover, .lesson-tabs button.is-active {
  border-color: var(--teal);
  color: var(--ink);
}

.lesson-view {
  padding-top: 39px;
}

.lesson-kicker {
  display: flex;
  color: var(--teal);
  letter-spacing: .12em;
  text-transform: uppercase;
  gap: 13px;
  margin-bottom: 21px;
  font-family: DM Mono, monospace;
  font-size: .66rem;
}

.lesson-kicker span:first-child {
  color: var(--orange);
}

.lesson-view h2 {
  max-width: 520px;
  margin-bottom: 19px;
  font-size: clamp(2.2rem, 4.2vw, 3.8rem);
}

.lesson-summary {
  color: var(--muted);
  max-width: 590px;
  line-height: 1.65;
}

.lesson-steps {
  display: grid;
  list-style: none;
  gap: 0;
  max-width: 600px;
  margin: 0 0 28px;
  padding: 24px 0 0;
}

.lesson-steps li {
  display: grid;
  grid-template-columns: 39px 1fr;
  border-top: 1px solid var(--line);
  gap: 14px;
  padding: 16px 0;
}

.lesson-steps span {
  color: var(--orange);
  font-family: DM Mono, monospace;
  font-size: .68rem;
}

.lesson-steps p {
  margin: 0;
  line-height: 1.5;
}

.lesson-note {
  display: grid;
  grid-template-columns: 104px 1fr;
  border-top: 1px solid var(--teal);
  border-bottom: 1px solid var(--line);
  gap: 12px;
  max-width: 600px;
  padding: 18px 0;
}

.lesson-note span {
  color: var(--teal);
  letter-spacing: .08em;
  text-transform: uppercase;
  font-family: DM Mono, monospace;
  font-size: .62rem;
}

.lesson-note p {
  color: var(--muted);
  margin: 0;
  font-family: Playfair Display, serif;
  font-size: 1.03rem;
  line-height: 1.4;
}

.complete-button {
  border: 1px solid var(--teal);
  color: var(--paper-light);
  background: var(--teal);
  cursor: pointer;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-top: 28px;
  padding: 13px 17px;
  font-family: DM Mono, monospace;
  font-size: .67rem;
}

.complete-button:hover {
  background: var(--teal-dark);
}

.complete-button.is-complete {
  color: var(--teal);
  background: none;
}

.lab {
  border-top: 1px solid var(--line);
  padding: 100px 0 110px;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items:  end;
  gap: 30px;
  margin-bottom: 44px;
}

.section-heading h2 {
  margin-bottom: 0;
}

.section-heading > p:last-child {
  color: var(--muted);
  max-width: 280px;
  margin-bottom: 4px;
  font-size: .92rem;
  line-height: 1.55;
}

.lab-grid {
  display: grid;
  grid-template-columns: 270px 1fr;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  align-items:  center;
  gap: 80px;
  padding: 45px 0;
}

.dial {
  display: flex;
  background: var(--teal);
  color: var(--paper-light);
  border-radius: 50%;
  flex-direction: column;
  justify-content: center;
  align-items:  center;
  height: 270px;
}

.dial-ring {
  display: grid;
  border: 1px solid #f8f5ed73;
  border-radius: 50%;
  place-items:  center;
  width: 150px;
  height: 150px;
}

.dial-ring span {
  letter-spacing: .1em;
  font-family: DM Mono, monospace;
  font-size: .76rem;
}

.dial strong {
  margin-top: -2px;
  font-size: 2.3rem;
  font-weight: 500;
}

.dial small {
  color: #f8f5eda6;
  text-transform: uppercase;
  font-family: DM Mono, monospace;
  font-size: .63rem;
}

.lab-controls {
  display: grid;
  gap: 28px;
  max-width: 600px;
}

.lab-controls label {
  display: grid;
  gap: 10px;
}

.lab-controls label > span {
  color: var(--muted);
  letter-spacing: .08em;
  text-transform: uppercase;
  font-family: DM Mono, monospace;
  font-size: .62rem;
}

.lab-controls select {
  border: 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  outline: none;
  background: none;
  width: 100%;
  padding: 12px 0;
}

.control-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 35px;
}

.lab-controls input {
  accent-color: var(--teal);
  width: 100%;
}

.lab-message {
  border-top: 1px solid var(--teal);
  color: var(--teal);
  margin: -2px 0 0;
  padding: 14px 0 0;
  font-size: .92rem;
  line-height: 1.5;
}

.quiz-section {
  border-top: 1px solid var(--line);
  padding: 104px 0 120px;
}

.quiz-section .section-heading {
  display: block;
}

.quiz-section h2 {
  max-width: 600px;
}

.quiz-card, .quiz-result {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  max-width: 800px;
  padding: 30px 0;
}

.quiz-meta {
  display: flex;
  color: var(--teal);
  letter-spacing: .08em;
  text-transform: uppercase;
  justify-content: space-between;
  font-family: DM Mono, monospace;
  font-size: .63rem;
}

.quiz-card h3 {
  letter-spacing: -.04em;
  max-width: 580px;
  margin: 38px 0 27px;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 500;
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.quiz-option {
  display: flex;
  border: 1px solid var(--line);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  background: none;
  justify-content: space-between;
  min-height: 70px;
  padding: 17px;
}

.quiz-option:hover {
  border-color: var(--teal);
}

.quiz-option.is-correct {
  border-color: var(--teal);
  color: var(--paper-light);
  background: var(--teal);
}

.quiz-option.is-wrong {
  border-color: var(--orange);
  color: var(--orange);
}

.quiz-option.is-muted {
  opacity: .45;
}

.quiz-feedback {
  display: flex;
  justify-content: space-between;
  align-items:  center;
  gap: 20px;
  margin-top: 22px;
}

.quiz-feedback p {
  color: var(--muted);
  max-width: 500px;
  margin: 0;
  line-height: 1.5;
}

.text-button {
  color: var(--teal);
  cursor: pointer;
  letter-spacing: .06em;
  text-transform: uppercase;
  white-space: nowrap;
  background: none;
  border: 0;
  padding: 0;
  font-family: DM Mono, monospace;
  font-size: .65rem;
}

.quiz-result {
  display: flex;
  align-items:  center;
  gap: 25px;
}

.result-score {
  color: var(--teal);
  font-family: Playfair Display, serif;
  font-size: 4rem;
  line-height: 1;
}

.quiz-result h3 {
  margin: 0 0 5px;
  font-size: 1.3rem;
  font-weight: 500;
}

.quiz-result p {
  color: var(--muted);
  margin: 0;
}

.footer {
  display: flex;
  border-top: 1px solid var(--line);
  color: var(--muted);
  letter-spacing: .06em;
  text-transform: uppercase;
  justify-content: space-between;
  align-items:  center;
  padding: 25px 0 34px;
  font-family: DM Mono, monospace;
  font-size: .62rem;
}

.footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .section-shell {
    width: min(100% - 38px, 600px);
  }

  .topbar {
    min-height: 75px;
  }

  .topbar nav {
    gap: 10px;
    font-size: .55rem;
  }

  .progress-chip {
    display: none;
  }

  .hero {
    display: block;
    min-height: auto;
    padding: 74px 0 80px;
  }

  .hero-copy {
    position: relative;
    z-index: 1;
  }

  .camera-sketch {
    margin: 60px auto 0;
    transform: scale(.82)rotate(-4deg);
  }

  .camera-tour {
    padding: 80px 0;
  }

  .camera-tour-heading {
    display: block;
  }

  .camera-view-switch {
    margin-top: 28px;
  }

  .camera-tour-layout {
    grid-template-columns: 1fr;
  }

  .camera-stage {
    margin: 0 -8px;
  }

  .camera-hotspot {
    width: 29px;
    height: 29px;
    font-size: .54rem;
  }

  .camera-part-card {
    min-height: 365px;
  }

  .guide {
    display: block;
    padding: 80px 0;
  }

  .guide-intro {
    margin-bottom: 64px;
  }

  .section-heading {
    display: block;
  }

  .section-heading > p:last-child {
    margin-top: 18px;
  }

  .lab {
    padding: 80px 0;
  }

  .lab-grid {
    grid-template-columns: 1fr;
    gap: 45px;
  }

  .dial {
    width: 220px;
    height: 220px;
  }

  .dial-ring {
    width: 120px;
    height: 120px;
  }

  .quiz-section {
    padding: 80px 0;
  }

  .quiz-options {
    grid-template-columns: 1fr;
  }

  .quiz-option {
    min-height: auto;
  }

  .quiz-feedback, .quiz-result {
    flex-direction: column;
    align-items:  flex-start;
  }

  .footer {
    flex-direction: column;
    align-items:  flex-start;
    gap: 13px;
  }
}