:root { --paper: #f8f2e5; --ink: #243e3a; --muted: #53645c; --accent: #a74632; --line: #8a9383; --space: 1.25rem; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 1rem/1.55 system-ui, sans-serif; }
main { max-width: 1440px; margin: auto; padding: clamp(1rem, 3vw, 3rem); }
[hidden] { display: none !important; }
header { display: flex; justify-content: space-between; align-items: end; flex-wrap: wrap; gap: 1rem; border-bottom: 2px solid var(--ink); padding-bottom: 1.2rem; margin-bottom: 1.5rem; }
a { color: var(--ink); text-underline-offset: .2em; }
nav { display: flex; gap: .25rem 1rem; flex-wrap: wrap; }
nav a, .text-link { display: inline-block; padding: .5rem 0; font-size: .875rem; font-weight: 650; }
.welcome { border-left: 3px solid var(--accent); padding: .25rem 1rem; margin-bottom: 1.5rem; }
.welcome h2 { font: 600 1.5rem/1.3 Georgia, serif; }
.result { border: 2px solid var(--ink); background: #e2e7da; padding: 1.25rem; margin-top: 1rem; }
.result h2 { font: 600 1.75rem/1.2 Georgia, serif; }
#result-score { font-weight: 750; font-variant-numeric: tabular-nums; }
h1 { font: 600 clamp(2rem, 4vw, 3.5rem)/1.15 Georgia, serif; letter-spacing: -.04em; margin: .3rem 0 .6rem; }
h2 { font-size: 1.15rem; line-height: 1.4; margin: 0 0 .6rem; }
p { margin: .5rem 0; }
.eyebrow { font-size: .75rem; font-weight: 750; letter-spacing: .16em; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 17rem; gap: 2rem; align-items: start; }
.court-heading { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: .5rem; }
#score { font-weight: 700; font-variant-numeric: tabular-nums; border-bottom: 2px solid var(--ink); padding-bottom: .25rem; }
#status { min-height: 3.2em; border-left: 2px solid var(--line); padding-left: .75rem; }
canvas { display: block; width: 100%; aspect-ratio: 8 / 5; border: 2px solid var(--ink); border-radius: 4px; }
#cue, #aim { font-size: .875rem; min-height: 1.6em; }
.court-readout { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .25rem 1rem; }
#aim { font-weight: 650; }
kbd { display: inline-block; border: 1px solid var(--line); border-bottom: 2px solid var(--ink); border-radius: 3px; padding: 0 .3em; font: 650 .85em/1.6 system-ui, sans-serif; background: #fffcf5; color: var(--ink); }
.quick-controls { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem; font-size: .8rem; }
.quick-controls span { margin-left: .5rem; }
.steps { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 2rem; padding-left: 1.25rem; font-size: .95rem; }
.steps li { padding-left: .25rem; margin-bottom: .9rem; }
.steps li::marker { font-weight: 750; color: var(--accent); }
.steps strong { display: block; margin-bottom: .4rem; }
.guide-columns { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 2rem; }
.tutorial { max-width: none; }
.postcards { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 1.25rem; }
.postcard { border: 1px solid var(--line); border-top: 4px solid var(--ink); padding: 1rem; }
.postcard h3 { margin-top: 0; font: 600 1.2rem/1.4 Georgia, serif; }
.postcard .hint { color: var(--ink); }
.postcard-hard { background: #cde5db; }
.postcard-clay { background: #efd3b8; }
.postcard-grass { background: #ded8ec; }
h3 { font-size: .95rem; margin: 1.25rem 0 .5rem; }
.actions { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1rem 0; }
button, summary, input, select { font: inherit; }
.choice { display: block; margin: .8rem 0; font-weight: 650; }
.choice select { display: block; width: 100%; min-width: 0; min-height: 44px; margin-top: .3rem; color: var(--ink); background: var(--paper); border: 1.5px solid var(--ink); border-radius: 4px; }
button { background: transparent; color: var(--ink); border: 1.5px solid var(--ink); border-radius: 4px; padding: .6rem .85rem; min-height: 44px; cursor: pointer; }
button.primary { background: var(--ink); color: var(--paper); }
button:hover:not(:disabled) { background: #e2e7da; color: var(--ink); }
button:disabled { opacity: .5; cursor: default; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.hint { color: var(--muted); font-size: .875rem; }
aside section + section { border-top: 1px solid var(--line); margin-top: 1.5rem; padding-top: 1.25rem; }
.range { display: flex; justify-content: space-between; flex-wrap: wrap; margin-top: 1rem; font-weight: 650; }
input[type=range] { width: 100%; min-height: 32px; accent-color: var(--ink); }
.check { display: flex; gap: .6rem; align-items: center; min-height: 36px; cursor: pointer; }
input[type=checkbox] { width: 20px; height: 20px; accent-color: var(--ink); flex-shrink: 0; }
.notes { max-width: 65rem; margin-top: 2rem; border-top: 1px solid var(--line); padding-top: 1.25rem; }
summary { cursor: pointer; font-weight: 650; padding: .6rem 0; }
pre { white-space: pre-wrap; overflow-wrap: anywhere; font-size: .8rem; }
footer { margin-top: 2rem; font-size: .75rem; color: var(--muted); }
.skip { position: absolute; top: -8rem; left: 1rem; padding: .6rem; background: var(--paper); color: var(--ink); z-index: 2; }
.skip:focus { top: 1rem; }
@media (max-width: 900px) { .layout { grid-template-columns: minmax(0, 1fr); } aside { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; } aside section + section { border: 0; padding: 0; margin: 0; } }
@media (max-width: 540px) { aside, .steps, .guide-columns, .postcards { grid-template-columns: minmax(0, 1fr); } .steps, .guide-columns { gap: .5rem; } .actions button { flex: 1 1 auto; } }
@media (forced-colors: active) { canvas { forced-color-adjust: none; } button, input, select { border: 1px solid ButtonText; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; } }