:root { color-scheme: light; font-family: "Segoe UI", system-ui, sans-serif; color: #172b2c; background: #f3f4ee; font-size: 16px; }
* { box-sizing: border-box; }
body { margin: 0; }
main { width: min(100% - 2.5rem, 780px); margin: 0 auto; padding: 3.5rem 0 2rem; }
header { margin-bottom: 2rem; }
.eyebrow { color: #376e62; font-size: .75rem; font-weight: 800; letter-spacing: .15em; }
h1 { font-size: clamp(2.5rem, 7vw, 4rem); letter-spacing: -.06em; line-height: 1.05; margin: 1rem 0; }
h1 span { color: #327767; }
.intro { color: #52615d; line-height: 1.6; max-width: 34rem; }
h2 { font-size: 1.2rem; letter-spacing: -.02em; margin: 0 0 1.25rem; }
h3 { font-size: 1rem; }
.card { background: #fff; border: 1px solid #dbe0d5; border-radius: 16px; padding: 1.75rem; margin: 1rem 0; box-shadow: 0 6px 20px #172b2c05; }
label { font-size: .95rem; font-weight: 650; }
.hint { color: #52615d; font-size: .85rem; line-height: 1.6; }
.input-row { display: flex; gap: .65rem; }
input[type="text"] { min-width: 0; flex: 1; border: 1px solid #94a69e; border-radius: 8px; padding: .8rem; font: inherit; }
button { background: #1d6657; color: #fff; border: 1px solid #1d6657; border-radius: 8px; padding: .75rem 1rem; font: inherit; font-weight: 650; cursor: pointer; }
button span { margin-left: .5rem; }
button:hover { background: #124b3f; }
button:disabled, input:disabled { cursor: wait; opacity: .6; }
:focus-visible { outline: 3px solid #b16020; outline-offset: 3px; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.section-heading h2 { margin: 0; }
.secondary { background: #fff; color: #1d6657; font-size: .8rem; padding: .55rem .7rem; }
.secondary:hover { background: #edf5ef; }
#task-list { margin: 0; padding: 0; list-style: none; }
#task-list li { border-top: 1px solid #e3e8df; padding: 1rem 0; }
#task-list label { display: flex; gap: .85rem; align-items: start; cursor: pointer; overflow-wrap: anywhere; }
input[type="checkbox"] { width: 1.2rem; height: 1.2rem; flex-shrink: 0; margin: .12rem 0 0; accent-color: #1d6657; }
.completed { color: #64736e; text-decoration: line-through; }
#empty { padding: 1.25rem .5rem 2rem; text-align: center; color: #52615d; }
.empty-symbol { font-size: 2.25rem; color: #327767; }
#error { padding: .85rem; border-left: 4px solid #a12a18; background: #fff0eb; color: #792014; line-height: 1.5; }
#status { color: #52615d; font-size: .85rem; min-height: 1.2rem; }
footer { color: #52615d; font-size: .8rem; line-height: 1.7; margin: 1.5rem .5rem; }
[hidden] { display: none !important; }
@media (max-width: 540px) { main { padding-top: 2rem; width: min(100% - 1.5rem, 780px); } .card { padding: 1.25rem; } .input-row { flex-direction: column; } .section-heading { align-items: flex-start; } .section-heading h2 { max-width: 9rem; } }