.deep-time{--ink:#f4ecd8;--muted:#c9bea8;--rust:#ed8054;--gold:#f5c65f;--moss:#89b991;--slate:#14242a;--deep:#071315;position:relative;margin:0 calc(50% - 50vw) -2rem;padding:0 max(1rem,calc((100vw - 1180px)/2));min-height:78vh;color:var(--ink);background:radial-gradient(circle at 82% 12%,rgba(237,128,84,.18),transparent 32%),linear-gradient(145deg,#102329,#071315 55%,#16140f);font-family:Inter,system-ui,sans-serif;overflow:hidden}.deep-time:before{content:"";position:absolute;inset:0;pointer-events:none;opacity:.25;background:repeating-linear-gradient(7deg,transparent 0 44px,rgba(245,198,95,.08) 45px 47px)}.deep-time button,.deep-time input{font:inherit}.dt-nav{position:relative;z-index:2;display:flex;justify-content:space-between;align-items:center;padding:1rem 0;border-bottom:1px solid rgba(244,236,216,.17)}.dt-back,.dt-quiet{color:var(--muted);background:none;border:0;text-decoration:none;cursor:pointer}.dt-back:hover,.dt-quiet:hover{color:var(--ink)}.dt-nav-actions{display:flex;gap:.9rem}.dt-intro,.dt-play,.dt-check,.dt-finish{position:relative;z-index:1}.dt-intro{padding:clamp(2.5rem,7vw,6rem) 0 3rem}.dt-intro-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(2rem,6vw,5rem);align-items:center}.dt-kicker{margin:0 0 .7rem;color:var(--gold);font-size:.76rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.dt-intro h1{margin:0;font-family:Georgia,serif;font-size:clamp(3.5rem,8vw,7rem);line-height:.82;letter-spacing:-.055em}.dt-intro h1 span{color:var(--rust);font-style:italic}.dt-lead{max-width:670px;margin:1.8rem 0;color:var(--muted);font-size:1.12rem;line-height:1.7}.dt-identity{max-width:560px;padding:1rem;border:1px solid rgba(245,198,95,.28);background:rgba(7,19,21,.72)}.dt-identity label{display:block;margin-bottom:.4rem;font-weight:800}.dt-identity input{width:100%;padding:.8rem;color:var(--ink);background:#0d1c20;border:1px solid rgba(244,236,216,.3);border-radius:4px}.dt-identity small{display:block;margin-top:.4rem;color:var(--muted)}#dt-start-error{margin:.5rem 0 0;color:#ff9c8b}.dt-primary{display:inline-flex;align-items:center;gap:.8rem;margin-top:1rem;padding:.85rem 1.15rem;color:#111;background:var(--gold);border:0;border-radius:4px;font-weight:900;cursor:pointer;box-shadow:0 8px 28px rgba(245,198,95,.15)}.dt-primary:hover{filter:brightness(1.08);transform:translateY(-1px)}.dt-primary:disabled{opacity:.55;cursor:wait}.dt-small-note{color:var(--muted);font-size:.82rem}.dt-core-preview{position:relative;padding:2rem;border:1px solid rgba(244,236,216,.2);background:rgba(4,12,14,.78);box-shadow:0 30px 70px rgba(0,0,0,.35)}.dt-core-slice{position:relative;height:380px;border:4px solid #081114;overflow:hidden;background:#211c16}.dt-core-slice i{display:block;height:20%;border-bottom:3px solid rgba(0,0,0,.25)}.dt-core-slice i:nth-child(1){background:repeating-linear-gradient(-12deg,#a25239 0 18px,#c07049 19px 33px)}.dt-core-slice i:nth-child(2){background:radial-gradient(circle at 30% 50%,#d9c690 0 7px,transparent 8px),#75694c}.dt-core-slice i:nth-child(3){background:repeating-linear-gradient(3deg,#354e51 0 12px,#43696b 13px 24px)}.dt-core-slice i:nth-child(4){background:#8e7d5a}.dt-core-slice i:nth-child(5){background:repeating-linear-gradient(-4deg,#613b32 0 9px,#805447 10px 19px)}.dt-core-slice b{position:absolute;left:52%;top:-10%;width:14%;height:125%;background:#e18a59;transform:rotate(10deg);box-shadow:0 0 0 3px #3a1d19}.dt-preview-scale{display:flex;justify-content:space-between;margin:.8rem 0;color:var(--muted);font-size:.72rem}.dt-core-preview p{margin:1.5rem 0 .2rem;color:var(--gold);letter-spacing:.16em}.dt-core-preview strong{font-family:ui-monospace,monospace}.dt-station-list{display:grid;grid-template-columns:repeat(5,1fr);margin:3.5rem 0 0;padding:0;list-style:none;border-top:1px solid rgba(244,236,216,.18)}.dt-station-list li{padding:1rem;border-right:1px solid rgba(244,236,216,.12)}.dt-station-list span,.dt-station-list small{display:block;color:var(--muted);font-size:.72rem}.dt-station-list strong{display:block;margin:.25rem 0}.dt-hud{display:grid;grid-template-columns:auto 1fr auto auto;gap:1.2rem;align-items:center;padding:1rem 0}.dt-hud>div:not(.dt-progress-track){display:flex;flex-direction:column}.dt-hud span{color:var(--muted);font-size:.68rem;text-transform:uppercase;letter-spacing:.1em}.dt-progress-track{height:6px;background:rgba(255,255,255,.12);overflow:hidden}.dt-progress-track span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--rust),var(--gold));transition:width .4s}.dt-workbench{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(290px,.55fr);min-height:650px;border:1px solid rgba(244,236,216,.2);background:rgba(6,16,18,.88)}.dt-visual-panel{position:relative;padding:1rem;border-right:1px solid rgba(244,236,216,.17)}.dt-visual-heading{display:flex;justify-content:space-between;color:var(--muted);font-size:.7rem;letter-spacing:.13em}.dt-visual{display:flex;align-items:center;justify-content:center;min-height:570px;padding:1.5rem}.dt-mission-panel{padding:clamp(1.3rem,3vw,2.4rem);background:rgba(15,31,34,.75)}.dt-mission-panel h2{margin:.3rem 0 1rem;font-family:Georgia,serif;font-size:2rem}.dt-mission-panel>p{color:var(--muted);line-height:1.65}.dt-evidence{margin:1.2rem 0;padding:1rem;border-left:3px solid var(--gold);background:rgba(245,198,95,.07)}.dt-evidence span{color:var(--gold);font-size:.68rem;font-weight:900;text-transform:uppercase}.dt-evidence p{margin:.35rem 0 0;font-size:.88rem;line-height:1.5}.dt-controls{display:grid;gap:.7rem}.dt-control,.dt-option{width:100%;padding:.8rem;text-align:left;color:var(--ink);background:#12272a;border:1px solid rgba(244,236,216,.22);border-radius:4px;cursor:pointer}.dt-control:hover,.dt-option:hover,.dt-control.is-selected{border-color:var(--gold);background:#1b3536}.dt-control.primary{color:#111;background:var(--gold);border-color:var(--gold);font-weight:900;text-align:center}.dt-readout{padding:.8rem;color:var(--gold);background:#081517;border:1px dashed rgba(245,198,95,.35);font:700 .8rem ui-monospace,monospace}.dt-toast{position:absolute;left:50%;bottom:2rem;transform:translateX(-50%);padding:.8rem 1rem;background:#271514;border:1px solid var(--rust);box-shadow:0 12px 35px #000}.dt-toast.is-good{background:#11251b;border-color:var(--moss)}.dt-rock-column{position:relative;width:min(460px,100%);border:8px solid #0a1618;box-shadow:0 20px 60px #000}.dt-layer{display:flex;align-items:center;justify-content:space-between;height:90px;padding:0 1.2rem;color:#fff;font-weight:900;text-shadow:0 2px 4px #000}.dt-layer small{font-weight:500}.dt-layer.a{background:repeating-linear-gradient(-5deg,#b45f42 0 14px,#8f4635 15px 29px)}.dt-layer.b{background:radial-gradient(circle at 25% 50%,#d5c187 0 5px,transparent 6px),#6e634b;background-size:58px 40px}.dt-layer.c{background:repeating-linear-gradient(4deg,#416267 0 11px,#314c51 12px 23px)}.dt-layer.d{background:repeating-linear-gradient(-2deg,#8d7754 0 7px,#a98f65 8px 15px)}.dt-geology-scene{position:relative;width:min(620px,100%);height:430px;border:6px solid #0a1618;overflow:hidden;background:#182c30}.dt-geology-scene .bed{position:absolute;left:0;width:100%;height:25%}.dt-geology-scene .bed.one{bottom:0;background:#80523f}.dt-geology-scene .bed.two{bottom:25%;background:#50666a}.dt-geology-scene .bed.three{bottom:50%;background:#a68b5f}.dt-geology-scene .bed.cap{bottom:75%;background:#6b7c58}.dt-intrusion{position:absolute;left:30%;bottom:-20px;width:18%;height:85%;background:#d87952;transform:rotate(-8deg);border:3px solid #40231d}.dt-fault{position:absolute;left:68%;top:-20px;width:5px;height:120%;background:#f4ecd8;transform:rotate(17deg);box-shadow:0 0 0 3px rgba(20,36,42,.7)}.dt-scene-label{position:absolute;padding:.2rem .45rem;background:#071315;color:#fff;font-size:.72rem}.dt-isotope-lab{width:min(650px,100%)}.dt-isotope-title{display:flex;justify-content:space-between;margin-bottom:1rem}.dt-atoms{display:grid;grid-template-columns:repeat(8,1fr);gap:.55rem;padding:1.4rem;background:#0d2023;border:1px solid rgba(255,255,255,.15)}.dt-atom{aspect-ratio:1;border-radius:50%;background:var(--rust);box-shadow:inset -5px -5px 0 rgba(0,0,0,.18)}.dt-atom.daughter{background:var(--gold)}.dt-half-life{width:100%;margin:1.5rem 0;accent-color:var(--rust)}.dt-isotope-key{display:flex;gap:1.2rem;color:var(--muted);font-size:.8rem}.dt-isotope-key i{display:inline-block;width:.75rem;height:.75rem;margin-right:.3rem;border-radius:50%;background:var(--rust)}.dt-isotope-key i.daughter{background:var(--gold)}.dt-timeline-wrap{width:100%}.dt-timeline{position:relative;height:110px;margin:2rem 0;background:linear-gradient(90deg,#422f3a,#7a4b43 35%,#9c7650 70%,#57796e);border:5px solid #0a1618}.dt-timeline:after{content:"4.6 billion years of Earth history";position:absolute;left:1rem;top:1rem;color:#fff;font-weight:900}.dt-time-marker{position:absolute;top:-18px;width:4px;height:145px;background:var(--gold);box-shadow:0 0 15px var(--gold)}.dt-time-labels{display:flex;justify-content:space-between;color:var(--muted)}.dt-eon-builder{display:grid;gap:.75rem;width:min(680px,100%)}.dt-eon{display:grid;grid-template-columns:110px 1fr auto;gap:1rem;align-items:center;padding:1rem;border-left:8px solid var(--rust);background:#12272a}.dt-eon:nth-child(2){border-color:#d49354}.dt-eon:nth-child(3){border-color:#b5aa70}.dt-eon:nth-child(4){border-color:#6ca194}.dt-eon small{color:var(--muted)}.dt-eon-actions{display:flex;gap:.35rem}.dt-eon-actions button{width:34px;height:34px;color:var(--ink);background:#0b181b;border:1px solid rgba(255,255,255,.2);cursor:pointer}.dt-check,.dt-finish{min-height:650px;padding:clamp(3rem,8vw,7rem) 0}.dt-check-card{position:relative;max-width:820px;margin:auto;padding:clamp(1.5rem,5vw,4rem);background:#102225;border:1px solid rgba(244,236,216,.22);overflow:hidden}.dt-check-number{position:absolute;right:-.05em;top:-.25em;color:rgba(245,198,95,.08);font:900 12rem Georgia,serif}.dt-check-card h2{position:relative;font:2.3rem Georgia,serif}.dt-check-card>p{position:relative;color:var(--muted);font-size:1.05rem}.dt-check-options{position:relative;display:grid;gap:.65rem}.dt-check-options button{padding:1rem;text-align:left;color:var(--ink);background:#142d30;border:1px solid rgba(255,255,255,.18);cursor:pointer}.dt-check-options button:hover{border-color:var(--gold)}.dt-check-options button.is-correct{border-color:var(--moss);background:#173527}.dt-check-options button.is-wrong{border-color:var(--rust);background:#3b2220}.dt-check-feedback{display:grid;gap:.25rem;margin-top:1rem;padding:1rem;background:#183527;border-left:4px solid var(--moss)}.dt-check-feedback.is-wrong{background:#3b2220;border-color:var(--rust)}.dt-proof{display:grid;grid-template-columns:300px 1fr;gap:3rem;align-items:center;max-width:930px;margin:auto}.dt-badge{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;aspect-ratio:1;text-align:center;color:#1a1510;background:radial-gradient(circle,#f7d77c 0 42%,#bb6f43 43% 47%,#102428 48% 55%,#e29b50 56%);border-radius:50%;box-shadow:0 0 0 8px #081416,0 25px 70px #000}.dt-badge small{font-weight:900;letter-spacing:.18em}.dt-badge strong{margin:.5rem 0;font:900 1.35rem Georgia,serif}.dt-badge b{font:.7rem ui-monospace,monospace}.dt-badge.is-locked{filter:grayscale(1);opacity:.55}.dt-finish h2{font:clamp(2.4rem,5vw,4rem) Georgia,serif}.dt-finish-message{color:var(--muted);line-height:1.7}.dt-proof-details{display:grid;grid-template-columns:1fr 1fr;gap:.7rem;margin:1.4rem 0}.dt-proof-details div{padding:.75rem;background:#102225}.dt-proof-details span{display:block;color:var(--muted);font-size:.7rem;text-transform:uppercase}.dt-screenshot-note{color:var(--gold)}.dt-notes{position:fixed;z-index:100;inset:0;display:grid;place-items:center;padding:1rem;background:rgba(0,0,0,.8)}.dt-notes[hidden]{display:none}.dt-notes section{position:relative;max-width:700px;max-height:85vh;overflow:auto;padding:2rem;color:var(--ink);background:#102225;border:1px solid rgba(245,198,95,.4)}.dt-notes-close{position:absolute;right:1rem;top:1rem;color:var(--ink);background:none;border:0;font-size:2rem;cursor:pointer}.dt-notes dl div{padding:1rem 0;border-top:1px solid rgba(255,255,255,.12)}.dt-notes dt{color:var(--gold);font-weight:900}.dt-notes dd{margin:.3rem 0 0;color:var(--muted);line-height:1.55}
@media(max-width:850px){.dt-intro-grid,.dt-workbench,.dt-proof{grid-template-columns:1fr}.dt-core-preview{display:none}.dt-station-list{grid-template-columns:1fr}.dt-station-list li{display:grid;grid-template-columns:40px 1fr 1fr}.dt-hud{grid-template-columns:1fr 1fr}.dt-progress-track{grid-column:1/-1;grid-row:2}.dt-visual-panel{border-right:0;border-bottom:1px solid rgba(255,255,255,.15)}.dt-visual{min-height:420px;padding:.5rem}.dt-proof{max-width:620px}.dt-badge{width:250px;margin:auto}}@media(max-width:520px){.dt-nav{align-items:flex-start}.dt-nav-actions{gap:.35rem;flex-wrap:wrap;justify-content:flex-end}.dt-quiet{font-size:.8rem}.dt-intro h1{font-size:3.3rem}.dt-hud{gap:.6rem}.dt-visual{min-height:360px}.dt-layer{height:70px}.dt-geology-scene{height:330px}.dt-eon{grid-template-columns:1fr auto}.dt-eon small{grid-column:1/-1}.dt-proof-details{grid-template-columns:1fr}.dt-check-number{font-size:8rem}}