/* ============================================================
   THE DARKROOM — photography school
   Warm-black darkroom interior, safelight amber, film-strip UI
   ============================================================ */

:root {
  --ink: #12100d;            /* warm black walls */
  --ink-2: #1a1712;          /* raised surfaces */
  --ink-3: #242019;          /* cards */
  --line: #352f24;           /* hairlines */
  --paper: #ece5d8;          /* fibre-paper white */
  --paper-dim: #b3a893;      /* faded caption */
  --paper-faint: #7d7462;    /* whisper */
  --amber: #e8a33d;          /* safelight */
  --amber-hot: #f6c268;
  --red: #cf4a2e;            /* developer tray red */
  --green: #7fa650;          /* fixer / done */
  --font-display: 'Young Serif', Georgia, serif;
  --font-body: 'Hanken Grotesk', 'Helvetica Neue', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --maxw: 1100px;
  --radius: 3px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--ink);
  background-image:
    radial-gradient(1200px 700px at 75% -10%, rgba(232, 163, 61, .07), transparent 60%),
    radial-gradient(900px 600px at -10% 110%, rgba(207, 74, 46, .05), transparent 55%);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--amber); color: var(--ink); }

/* film grain over everything */
.grain {
  position: fixed; inset: -50%;
  width: 200%; height: 200%;
  pointer-events: none;
  z-index: 999;
  opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain-shift 1.2s steps(4) infinite;
}
@keyframes grain-shift {
  0% { transform: translate(0,0); }
  25% { transform: translate(-2%,1%); }
  50% { transform: translate(1%,-2%); }
  75% { transform: translate(-1%,2%); }
  100% { transform: translate(2%,-1%); }
}

.mono { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; }

/* ---------------- top bar ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 2rem;
  padding: .9rem 2rem;
  background: rgba(18, 16, 13, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: .6rem; text-decoration: none; color: var(--paper); }
.brand-aperture { align-self: center; display: grid; place-items: center; }
.brand-aperture svg { display: block; }
.ap-blades path { fill: var(--amber); }
.ap-blades { transform-origin: 50% 50%; transition: transform .6s cubic-bezier(.2,.8,.2,1); }
.brand:hover .ap-blades { transform: rotate(60deg); }
.brand-name { font-family: var(--font-display); font-size: 1.25rem; }
.brand-sub { font-family: var(--font-mono); font-size: .62rem; letter-spacing: .22em; text-transform: uppercase; color: var(--amber); }
.topnav { margin-left: auto; display: flex; gap: 1.6rem; }
.topnav a {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--paper-dim); text-decoration: none; padding: .3rem 0;
  border-bottom: 2px solid transparent; transition: color .2s, border-color .2s;
}
.topnav a:hover { color: var(--paper); }
.topnav a.active { color: var(--amber); border-bottom-color: var(--amber); }
.topbar-progress { font-family: var(--font-mono); font-size: .72rem; color: var(--amber); letter-spacing: .1em; }

/* ---------------- layout ---------------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 3rem 2rem 6rem; outline: none; }

.footer {
  border-top: 1px solid var(--line);
  padding: 1.4rem 2rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem;
  color: var(--paper-faint); font-size: .82rem;
}
.footer .mono { color: var(--amber); opacity: .7; }

/* view transitions */
.view { animation: develop .55s cubic-bezier(.2,.7,.2,1) both; }
@keyframes develop {
  from { opacity: 0; filter: brightness(1.6) contrast(.75) sepia(.35); transform: translateY(10px); }
  to   { opacity: 1; filter: none; transform: none; }
}

/* ---------------- home / hero ---------------- */
.hero { padding: 3.5rem 0 3rem; position: relative; }
.hero-kicker { color: var(--amber); margin-bottom: 1.2rem; display: flex; align-items: center; gap: .8rem; }
.hero-kicker::before { content: ""; width: 42px; height: 1px; background: var(--amber); display: inline-block; }
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 1.06; font-weight: 400; letter-spacing: -.01em;
  max-width: 15ch;
}
.hero h1 em { font-style: normal; color: var(--amber); }
.hero p.lede { max-width: 54ch; margin-top: 1.4rem; color: var(--paper-dim); font-size: 1.08rem; font-weight: 300; }
.hero-cta { margin-top: 2.2rem; display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }

.btn {
  display: inline-flex; align-items: center; gap: .6rem;
  font-family: var(--font-mono); font-size: .74rem; letter-spacing: .14em; text-transform: uppercase;
  padding: .85rem 1.5rem; border-radius: var(--radius);
  border: 1px solid var(--amber); cursor: pointer; text-decoration: none;
  transition: transform .15s, box-shadow .2s, background .2s, color .2s;
}
.btn-primary { background: var(--amber); color: var(--ink); font-weight: 600; }
.btn-primary:hover { background: var(--amber-hot); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,163,61,.25); }
.btn-ghost { background: transparent; color: var(--amber); }
.btn-ghost:hover { background: rgba(232,163,61,.1); transform: translateY(-2px); }
.btn-small { padding: .55rem 1rem; font-size: .68rem; }
.btn[disabled] { opacity: .4; cursor: not-allowed; transform: none !important; }

/* progress ring on dashboard */
.dash {
  display: grid; grid-template-columns: auto 1fr; gap: 2.5rem; align-items: center;
  border: 1px solid var(--line); background: var(--ink-2);
  border-radius: var(--radius); padding: 1.8rem 2.2rem; margin: 2.5rem 0 3.5rem;
}
.ring { position: relative; width: 118px; height: 118px; }
.ring svg { transform: rotate(-90deg); }
.ring .track { stroke: var(--line); }
.ring .fill { stroke: var(--amber); stroke-linecap: round; transition: stroke-dashoffset 1s cubic-bezier(.2,.8,.2,1); }
.ring-label { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; }
.ring-label b { font-family: var(--font-display); font-size: 1.5rem; font-weight: 400; display: block; }
.ring-label span { font-family: var(--font-mono); font-size: .58rem; letter-spacing: .16em; text-transform: uppercase; color: var(--paper-faint); }
.dash-stats { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.dash-stat b { font-family: var(--font-display); font-size: 1.7rem; font-weight: 400; color: var(--paper); display: block; }
.dash-stat span { color: var(--paper-faint); font-size: .82rem; }
.dash-resume { grid-column: 1 / -1; border-top: 1px dashed var(--line); padding-top: 1.2rem; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.dash-resume .mono { color: var(--paper-faint); }

/* ---------------- module contact sheet ---------------- */
.section-head { display: flex; align-items: baseline; gap: 1.2rem; margin: 3rem 0 1.6rem; }
.section-head h2 { font-family: var(--font-display); font-weight: 400; font-size: 1.7rem; }
.section-head .mono { color: var(--paper-faint); }
.section-head::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.sheet { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.2rem; }

.module-card {
  position: relative; display: block; text-decoration: none; color: var(--paper);
  background: var(--ink-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem 1.4rem 1.3rem; overflow: hidden;
  transition: transform .2s, border-color .2s, box-shadow .25s;
}
.module-card:hover { transform: translateY(-4px); border-color: var(--amber); box-shadow: 0 14px 34px rgba(0,0,0,.45); }
.module-card::before { /* sprocket strip */
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 10px;
  background-image: radial-gradient(circle at 8px 5px, var(--ink) 3px, transparent 3.5px);
  background-size: 22px 10px; background-color: var(--ink-3);
  border-bottom: 1px solid var(--line);
}
.module-num { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .2em; color: var(--amber); margin: .6rem 0 .6rem; display: flex; justify-content: space-between; }
.module-card h3 { font-family: var(--font-display); font-weight: 400; font-size: 1.28rem; line-height: 1.25; margin-bottom: .5rem; }
.module-card p { color: var(--paper-dim); font-size: .88rem; line-height: 1.55; font-weight: 300; }
.module-meta { margin-top: 1rem; display: flex; align-items: center; gap: .8rem; }
.module-bar { flex: 1; height: 3px; background: var(--line); border-radius: 2px; overflow: hidden; }
.module-bar i { display: block; height: 100%; background: var(--amber); border-radius: 2px; transition: width .6s; }
.module-bar i.done { background: var(--green); }
.module-pct { font-family: var(--font-mono); font-size: .64rem; color: var(--paper-faint); min-width: 5.5em; text-align: right; }
.module-card .badge-done {
  position: absolute; top: 1.35rem; right: 1.1rem; color: var(--green);
  font-family: var(--font-mono); font-size: .62rem; letter-spacing: .14em;
  border: 1px solid var(--green); border-radius: 2px; padding: .15rem .45rem;
  transform: rotate(4deg);
}

/* ---------------- module page ---------------- */
.crumbs { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--paper-faint); margin-bottom: 2rem; }
.crumbs a { color: var(--paper-dim); text-decoration: none; }
.crumbs a:hover { color: var(--amber); }
.crumbs span { color: var(--amber); }

.module-hero { margin-bottom: 2.5rem; }
.module-hero .mono { color: var(--amber); }
.module-hero h1 { font-family: var(--font-display); font-weight: 400; font-size: clamp(2rem, 4.5vw, 3.1rem); margin: .5rem 0 .9rem; }
.module-hero p { color: var(--paper-dim); max-width: 60ch; font-weight: 300; }

.lesson-list { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.lesson-row {
  display: flex; align-items: center; gap: 1.2rem;
  padding: 1.05rem 1.4rem; text-decoration: none; color: var(--paper);
  background: var(--ink-2); border-bottom: 1px solid var(--line);
  transition: background .18s, padding-left .18s;
}
.lesson-row:last-child { border-bottom: none; }
.lesson-row:hover { background: var(--ink-3); padding-left: 1.8rem; }
.lesson-row .idx { font-family: var(--font-mono); font-size: .7rem; color: var(--paper-faint); width: 2.4em; }
.lesson-row .t { flex: 1; font-size: .98rem; }
.lesson-row .dur { font-family: var(--font-mono); font-size: .66rem; color: var(--paper-faint); letter-spacing: .1em; }
.check {
  width: 20px; height: 20px; border-radius: 50%; border: 1.5px solid var(--paper-faint);
  display: grid; place-items: center; font-size: .7rem; color: transparent; flex: none;
  transition: all .25s;
}
.check.on { background: var(--green); border-color: var(--green); color: var(--ink); }
.lesson-row.quiz-row .t { color: var(--amber); }
.lesson-row.quiz-row .idx { color: var(--amber); }

/* ---------------- lesson page ---------------- */
.lesson-shell { max-width: 760px; margin: 0 auto; }
.lesson-head { margin-bottom: 2.4rem; }
.lesson-head .mono { color: var(--amber); }
.lesson-head h1 { font-family: var(--font-display); font-weight: 400; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.15; margin-top: .5rem; }

.lesson-body p { margin: 1.1rem 0; color: #d9d1c2; font-weight: 300; }
.lesson-body p b, .lesson-body li b { color: var(--paper); font-weight: 600; }
.lesson-body h2 {
  font-family: var(--font-display); font-weight: 400; font-size: 1.45rem;
  margin: 2.6rem 0 .4rem; color: var(--paper);
  display: flex; align-items: center; gap: .8rem;
}
.lesson-body h2::before { content: "▸"; color: var(--amber); font-size: .9rem; }
.lesson-body ul, .lesson-body ol { margin: 1.1rem 0 1.1rem 1.4rem; color: #d9d1c2; font-weight: 300; }
.lesson-body li { margin: .45rem 0; }
.lesson-body li::marker { color: var(--amber); }

.callout {
  margin: 1.6rem 0; padding: 1.1rem 1.3rem; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--ink-2);
  border-left: 3px solid var(--amber);
}
.callout .callout-label { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .18em; text-transform: uppercase; color: var(--amber); display: block; margin-bottom: .4rem; }
.callout p { margin: 0; font-size: .94rem; }
.callout.assignment { border-left-color: var(--red); }
.callout.assignment .callout-label { color: var(--red); }
.callout.recipe { border-left-color: var(--green); }
.callout.recipe .callout-label { color: var(--green); }

table.spec {
  width: 100%; border-collapse: collapse; margin: 1.4rem 0; font-size: .88rem;
}
table.spec th {
  font-family: var(--font-mono); font-size: .64rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--amber); text-align: left; padding: .6rem .8rem; border-bottom: 1px solid var(--amber);
}
table.spec td { padding: .6rem .8rem; border-bottom: 1px solid var(--line); color: #d9d1c2; font-weight: 300; vertical-align: top; }
table.spec tr td:first-child { font-family: var(--font-mono); font-size: .78rem; color: var(--paper); white-space: nowrap; }

.lesson-nav {
  margin-top: 3.2rem; padding-top: 1.6rem; border-top: 1px dashed var(--line);
  display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.complete-btn { position: relative; overflow: hidden; }
.complete-btn.done { border-color: var(--green); color: var(--green); background: rgba(127,166,80,.08); }

/* ---------------- widgets (shared) ---------------- */
.widget {
  margin: 2rem 0; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--ink-2); overflow: hidden;
}
.widget-head {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .7rem 1.1rem; border-bottom: 1px solid var(--line); background: var(--ink-3);
}
.widget-head .mono { color: var(--amber); }
.widget-body { padding: 1.2rem; }
.widget-canvas { border-radius: 2px; overflow: hidden; border: 1px solid var(--line); background: #000; }
.widget-canvas svg { display: block; width: 100%; height: auto; }

.ctl-grid { display: grid; gap: 1rem; margin-top: 1.1rem; }
.ctl { display: grid; grid-template-columns: 108px 1fr 88px; align-items: center; gap: .9rem; }
.ctl label { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .12em; text-transform: uppercase; color: var(--paper-dim); }
.ctl output { font-family: var(--font-mono); font-size: .78rem; color: var(--amber); text-align: right; }
input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 22px; background: transparent; cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track { height: 3px; background: var(--line); border-radius: 2px; }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 15px; height: 15px; border-radius: 50%;
  background: var(--amber); margin-top: -6px; border: 2px solid var(--ink);
  box-shadow: 0 0 0 1px var(--amber); transition: transform .12s;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }
input[type="range"]::-moz-range-track { height: 3px; background: var(--line); border-radius: 2px; }
input[type="range"]::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%; background: var(--amber); border: 2px solid var(--ink);
  box-shadow: 0 0 0 1px var(--amber);
}

.exif-strip {
  display: flex; gap: 1.6rem; flex-wrap: wrap; margin-top: 1rem;
  font-family: var(--font-mono); font-size: .74rem; color: var(--paper-dim);
  padding: .6rem .9rem; background: #000; border-radius: 2px; border: 1px solid var(--line);
}
.exif-strip b { color: var(--amber); font-weight: 500; }

.meter { display: flex; align-items: center; gap: .6rem; margin-top: .9rem; }
.meter-scale { position: relative; flex: 1; height: 26px; background: var(--ink-3); border: 1px solid var(--line); border-radius: 2px; }
.meter-scale .tick { position: absolute; top: 0; bottom: 0; width: 1px; background: var(--line); }
.meter-scale .tick.mid { background: var(--paper-dim); }
.meter-needle {
  position: absolute; top: 2px; bottom: 2px; width: 3px; background: var(--amber); border-radius: 2px;
  transition: left .25s cubic-bezier(.2,.8,.2,1), background .25s; transform: translateX(-50%);
}
.meter-label { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .1em; text-transform: uppercase; color: var(--paper-dim); min-width: 8.5em; text-align: right; }
.meter-label.good { color: var(--green); }

.preset-row { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: 1rem; }
.chip {
  font-family: var(--font-mono); font-size: .64rem; letter-spacing: .1em; text-transform: uppercase;
  padding: .42rem .8rem; border: 1px solid var(--line); border-radius: 999px;
  background: transparent; color: var(--paper-dim); cursor: pointer; transition: all .15s;
}
.chip:hover { border-color: var(--amber); color: var(--amber); }
.chip.on { background: var(--amber); border-color: var(--amber); color: var(--ink); font-weight: 600; }

.widget-hint { margin-top: .9rem; font-size: .82rem; color: var(--paper-faint); font-style: italic; }
.score-flash { font-family: var(--font-mono); font-size: .78rem; color: var(--green); }

/* ---------------- quiz ---------------- */
.quiz-shell { max-width: 700px; margin: 0 auto; }
.quiz-q {
  font-family: var(--font-display); font-size: 1.35rem; font-weight: 400; line-height: 1.35; margin: 1.6rem 0 1.4rem;
}
.quiz-progress { display: flex; gap: .4rem; margin-bottom: 1.5rem; }
.quiz-progress i { flex: 1; height: 3px; background: var(--line); border-radius: 2px; }
.quiz-progress i.done { background: var(--amber); }
.quiz-progress i.wrong { background: var(--red); }
.quiz-opts { display: grid; gap: .7rem; }
.quiz-opt {
  text-align: left; padding: .95rem 1.2rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--ink-2); color: var(--paper); font-family: var(--font-body); font-size: .95rem;
  cursor: pointer; transition: all .15s; display: flex; gap: .9rem; align-items: baseline;
}
.quiz-opt .key { font-family: var(--font-mono); font-size: .68rem; color: var(--amber); }
.quiz-opt:hover:not([disabled]) { border-color: var(--amber); transform: translateX(4px); }
.quiz-opt.correct { border-color: var(--green); background: rgba(127,166,80,.12); }
.quiz-opt.incorrect { border-color: var(--red); background: rgba(207,74,46,.12); }
.quiz-opt[disabled] { cursor: default; opacity: .75; }
.quiz-opt.correct[disabled], .quiz-opt.incorrect[disabled] { opacity: 1; }
.quiz-why {
  margin-top: 1.2rem; padding: 1rem 1.2rem; border-left: 3px solid var(--amber);
  background: var(--ink-2); border-radius: var(--radius); font-size: .9rem; color: #d9d1c2;
  animation: develop .4s both;
}
.quiz-result { text-align: center; padding: 3rem 0; }
.quiz-result .big { font-family: var(--font-display); font-size: 3.4rem; color: var(--amber); }
.quiz-result p { color: var(--paper-dim); margin: .8rem 0 2rem; }

/* ---------------- field notes ---------------- */
.notes-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.2rem; }
.note-card {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--ink-2);
  padding: 1.4rem 1.4rem 1.2rem; position: relative;
}
.note-card .mono { color: var(--amber); display: block; margin-bottom: .6rem; }
.note-card h3 { font-family: var(--font-display); font-weight: 400; font-size: 1.1rem; margin-bottom: .5rem; }
.note-card p { font-size: .88rem; color: var(--paper-dim); font-weight: 300; }
.note-card:nth-child(3n) { transform: rotate(.4deg); }
.note-card:nth-child(3n+1) { transform: rotate(-.35deg); }

/* syllabus */
.syllabus-row { display: grid; grid-template-columns: 64px 1fr auto; gap: 1.4rem; padding: 1.3rem 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.syllabus-row .num { font-family: var(--font-display); font-size: 1.6rem; color: var(--amber); }
.syllabus-row h3 { font-family: var(--font-display); font-weight: 400; font-size: 1.2rem; }
.syllabus-row h3 a { color: var(--paper); text-decoration: none; }
.syllabus-row h3 a:hover { color: var(--amber); }
.syllabus-row p { color: var(--paper-dim); font-size: .88rem; font-weight: 300; margin-top: .3rem; }
.syllabus-row .mono { color: var(--paper-faint); }

/* stagger reveals on home */
.stagger > * { animation: develop .5s both; }
.stagger > *:nth-child(1) { animation-delay: .03s; }
.stagger > *:nth-child(2) { animation-delay: .09s; }
.stagger > *:nth-child(3) { animation-delay: .15s; }
.stagger > *:nth-child(4) { animation-delay: .21s; }
.stagger > *:nth-child(5) { animation-delay: .27s; }
.stagger > *:nth-child(6) { animation-delay: .33s; }
.stagger > *:nth-child(7) { animation-delay: .39s; }
.stagger > *:nth-child(8) { animation-delay: .45s; }
.stagger > *:nth-child(9) { animation-delay: .51s; }
.stagger > *:nth-child(10) { animation-delay: .57s; }

/* comparison hold */
.hold-compare { user-select: none; touch-action: manipulation; }

@media (max-width: 720px) {
  .topbar { padding: .8rem 1rem; gap: 1rem; flex-wrap: wrap; }
  .brand-sub { display: none; }
  main { padding: 2rem 1.1rem 4rem; }
  .dash { grid-template-columns: 1fr; text-align: center; }
  .ring { margin: 0 auto; }
  .dash-stats { justify-content: center; }
  .ctl { grid-template-columns: 84px 1fr 70px; }
  .syllabus-row { grid-template-columns: 44px 1fr; }
  .syllabus-row .mono { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .grain { animation: none; }
}