:root {
    color-scheme: light;
    --page: #f5f7fb;
    --surface: #ffffff;
    --surface-muted: #eef2f8;
    --text: #172033;
    --muted: #5d697e;
    --border: #d8deea;
    --primary: #274690;
    --primary-hover: #1f3977;
    --primary-text: #ffffff;
    --success: #176b4b;
    --success-bg: #e7f6ef;
    --warning: #9a5b08;
    --danger: #a22631;
    --danger-bg: #fcecee;
    --focus: #f0a202;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 16px;
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--page); }
body { margin: 0; color: var(--text); background: var(--page); line-height: 1.5; }
a { color: var(--primary); }
a:hover { text-decoration-thickness: 2px; }
button, input, select { font: inherit; }
button, select { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible, a:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 3px;
}
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: .25rem; font-size: clamp(1.7rem, 4vw, 2.25rem); line-height: 1.15; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
small { display: block; color: var(--muted); }
code { padding: .1rem .3rem; background: var(--surface-muted); border-radius: .25rem; }
hr { border: 0; border-top: 1px solid var(--border); margin: 1.5rem 0; }

.skip-link { position: absolute; left: 1rem; top: -5rem; z-index: 10; padding: .65rem 1rem; background: var(--text); color: #fff; }
.skip-link:focus { top: 1rem; }
.site-header { display: flex; align-items: center; gap: 1.5rem; min-height: 4.25rem; padding: .75rem max(1rem, calc((100% - 1120px) / 2)); background: var(--surface); border-bottom: 1px solid var(--border); }
.brand { display: inline-flex; align-items: center; gap: .55rem; color: var(--text); font-weight: 700; text-decoration: none; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 2.1rem; height: 2.1rem; border-radius: .6rem; color: var(--primary-text); background: var(--primary); font-size: 1.35rem; }
.main-nav { display: flex; flex-wrap: wrap; gap: .25rem; }
.main-nav a { padding: .55rem .7rem; border-radius: .5rem; color: var(--muted); text-decoration: none; }
.main-nav a[aria-current="page"] { color: var(--text); background: var(--surface-muted); font-weight: 650; }
.logout-form { margin-left: auto; }
.page-shell { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; padding: 2rem 0 3rem; }
.site-footer { padding: 1.25rem; border-top: 1px solid var(--border); color: var(--muted); text-align: center; }
.page-heading { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; }
.page-heading p { margin-bottom: 0; }
.page-total { font-size: 1.15rem; white-space: nowrap; }
.muted { color: var(--muted); }
.eyebrow { margin-bottom: .25rem; color: var(--primary); font-size: .82rem; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; }

.panel { margin-bottom: 1rem; padding: 1.25rem; border: 1px solid var(--border); border-radius: .85rem; background: var(--surface); box-shadow: 0 2px 10px rgba(26, 37, 63, .04); }
.panel > :last-child { margin-bottom: 0; }
.panel-heading, .hierarchy-heading { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.panel-heading h2, .hierarchy-heading h2, .hierarchy-heading h3 { margin-bottom: 0; }
.narrow-panel { max-width: 850px; }
.empty-state { text-align: center; padding-block: 2.5rem; }
.empty-copy { color: var(--muted); }

.button { display: inline-flex; align-items: center; justify-content: center; min-height: 2.65rem; padding: .58rem .9rem; border: 1px solid var(--border); border-radius: .55rem; color: var(--text); background: var(--surface); font-weight: 650; line-height: 1.2; text-decoration: none; }
.button:hover { background: var(--surface-muted); }
.button-primary { border-color: var(--primary); color: var(--primary-text); background: var(--primary); }
.button-primary:hover { background: var(--primary-hover); }
.button-danger { border-color: var(--danger); color: #fff; background: var(--danger); }
.button-danger-outline { border-color: var(--danger); color: var(--danger); background: var(--surface); }
.button-quiet, .text-button { border-color: transparent; color: var(--muted); background: transparent; }
.text-button { padding: .25rem; border: 0; text-decoration: underline; }
.button:disabled { opacity: .6; cursor: wait; }
.text-link { white-space: nowrap; }

.stack-form { display: grid; gap: 1rem; }
.inline-form { display: flex; align-items: end; gap: .65rem; }
.compact-form { margin-top: .75rem; }
.project-form { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.grow { flex: 1; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; align-items: end; }
.form-grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.report-filters { grid-template-columns: 1fr 1fr 1fr auto; }
label { display: grid; gap: .35rem; color: var(--muted); font-weight: 600; }
input, select { width: 100%; min-height: 2.7rem; padding: .58rem .65rem; border: 1px solid #aeb8ca; border-radius: .5rem; color: var(--text); background: var(--surface); }
input::placeholder { color: #748097; }
.form-actions { display: flex; align-items: center; flex-wrap: wrap; gap: .75rem; }
.form-message { margin: 0; color: var(--danger); font-weight: 600; }

.timer-panel { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 1.25rem; border-top: 4px solid var(--primary); }
.timer-panel form, .timer-panel .panel-heading, .timer-panel .form-message { grid-column: 1 / -1; }
.timer-actions { display: flex; align-items: center; gap: 1rem; }
.timer-value { font-size: clamp(1.9rem, 5vw, 3rem); line-height: 1; font-variant-numeric: tabular-nums; letter-spacing: .03em; white-space: nowrap; }
.timer-running { border-top-color: var(--success); }
.timer-paused { border-top-color: var(--warning); }
.manual-panel summary { cursor: pointer; font-weight: 700; }
.manual-panel[open] summary { margin-bottom: 1rem; }

.alert { margin-bottom: 1rem; padding: .8rem 1rem; border-radius: .55rem; border: 1px solid; }
.alert-success { border-color: #8bc9ae; color: var(--success); background: var(--success-bg); }
.alert-error { border-color: #e4a4ab; color: var(--danger); background: var(--danger-bg); }

.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: .8rem .65rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: .88rem; }
tbody tr:last-child td { border-bottom: 0; }
.numeric { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.row-actions { text-align: right; }

.hierarchy-client { padding: 0; overflow: hidden; }
.hierarchy-client > .hierarchy-heading { padding: 1.15rem 1.25rem; background: var(--surface-muted); }
.hierarchy-project { padding: 1.1rem 1.25rem; border-top: 1px solid var(--border); }
.task-list { margin: .75rem 0 0; padding: 0; list-style: none; }
.task-list li { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .55rem 0; border-bottom: 1px solid var(--border); }
.task-list li:last-child { border-bottom: 0; }
.item-tools { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: .4rem; }
.rename-details { text-align: right; }
.rename-details summary { color: var(--primary); cursor: pointer; text-decoration: underline; }
.rename-form { width: min(420px, 85vw); margin-top: .45rem; padding: .65rem; border: 1px solid var(--border); border-radius: .65rem; background: var(--surface); }

.summary-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.summary-card { display: grid; gap: .35rem; }
.summary-card span { color: var(--muted); }
.summary-card strong { font-size: 1.65rem; font-variant-numeric: tabular-nums; }
.report-bars { display: grid; gap: 1rem; }
.report-bar-row { display: grid; grid-template-columns: minmax(160px, 1fr) 2fr minmax(80px, auto); align-items: center; gap: 1rem; }
.report-track { width: 100%; height: .8rem; overflow: hidden; border: 0; border-radius: 999px; background: var(--surface-muted); }
.report-track::-webkit-progress-bar { background: var(--surface-muted); }
.report-track::-webkit-progress-value { background: var(--primary); }
.report-track::-moz-progress-bar { background: var(--primary); }

.auth-page { display: grid; min-height: 100vh; place-items: center; padding: 1rem; }
.auth-panel { width: min(430px, 100%); padding: 1.6rem; border: 1px solid var(--border); border-radius: .9rem; background: var(--surface); box-shadow: 0 12px 34px rgba(26, 37, 63, .10); }
.auth-brand { margin-bottom: 1.5rem; }
.setup-note { margin: 1rem 0 0; text-align: center; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 800px) {
    .site-header { align-items: flex-start; flex-wrap: wrap; gap: .65rem 1rem; }
    .main-nav { order: 3; width: 100%; }
    .main-nav a { flex: 1; text-align: center; }
    .form-grid-three, .report-filters { grid-template-columns: 1fr 1fr; }
    .report-filters .button { align-self: end; }
    .summary-grid { grid-template-columns: 1fr; gap: 0; }
}

@media (max-width: 560px) {
    .page-shell { width: min(100% - 1rem, 1120px); padding-top: 1rem; }
    .page-heading, .timer-panel, .timer-actions { align-items: stretch; flex-direction: column; }
    .page-heading { display: flex; }
    .page-total { white-space: normal; }
    .timer-panel { display: flex; }
    .timer-actions { display: flex; }
    .form-grid, .form-grid-three, .report-filters { grid-template-columns: 1fr; }
    .inline-form { align-items: stretch; flex-direction: column; }
    .report-bar-row { grid-template-columns: 1fr auto; }
    .report-track { grid-column: 1 / -1; grid-row: 2; }
    .site-footer { font-size: .9rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}