:root {
  color-scheme: light;
  --page: #f4f7f7;
  --surface: #ffffff;
  --surface-soft: #edf4f3;
  --surface-strong: #dcebe8;
  --text: #17302d;
  --text-soft: #5d716e;
  --line: #d9e3e1;
  --primary: #256c64;
  --primary-strong: #194f49;
  --primary-soft: #dcefeb;
  --danger: #a33e49;
  --danger-soft: #f8e4e6;
  --warning: #946117;
  --warning-soft: #fff0cf;
  --caution: #7a6a12;
  --caution-soft: #f5efc9;
  --success: #2b7151;
  --success-soft: #dff1e7;
  --neutral-soft: #e9eeef;
  --shadow: 0 16px 42px rgba(25, 61, 57, 0.08);
  --radius: 18px;
  --radius-small: 11px;
  --chart-systolic: #c14f5a;
  --chart-diastolic: #356c9a;
  --chart-sugar: #6a5aa8;
  --chart-grid: #dbe3e8;
  --chart-text: #60716f;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--page); }
body {
  min-height: 100vh;
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; }
a { color: var(--primary); text-underline-offset: 0.18em; }
a:hover { color: var(--primary-strong); }
img, canvas { max-width: 100%; }
.shell { width: min(1180px, calc(100% - 36px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -100px; z-index: 100; background: var(--text); color: #fff; padding: 10px 14px; border-radius: 8px; }
.skip-link:focus { top: 16px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid rgba(217, 227, 225, 0.9); background: color-mix(in srgb, var(--surface) 94%, transparent); backdrop-filter: blur(14px); }
.nav-wrap { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; text-decoration: none; letter-spacing: -0.02em; }
.brand-mark, .auth-brand { display: grid; place-items: center; background: var(--primary); color: #fff; font-weight: 900; }
.brand-mark { width: 34px; height: 34px; border-radius: 11px; font-size: 22px; }
.primary-nav { display: flex; align-items: center; gap: 4px; }
.primary-nav > a { padding: 9px 12px; color: var(--text-soft); text-decoration: none; border-radius: 9px; font-weight: 650; }
.primary-nav > a:hover, .primary-nav > a[aria-current="page"] { color: var(--primary-strong); background: var(--primary-soft); }
.nav-logout { margin-left: 8px; }
.nav-toggle { display: none; border: 1px solid var(--line); background: var(--surface); color: var(--text); padding: 8px 12px; border-radius: 9px; font-weight: 700; }

.main-content { padding-block: 38px 70px; min-height: calc(100vh - 140px); }
.auth-main { min-height: 100vh; display: grid; place-items: center; padding-block: 40px; }
.site-footer { border-top: 1px solid var(--line); color: var(--text-soft); font-size: 0.86rem; }
.footer-wrap { min-height: 70px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.footer-wrap p { margin: 0; }

h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(2rem, 4vw, 3.1rem); line-height: 1.07; letter-spacing: -0.045em; }
h2 { margin: 0; font-size: 1.2rem; letter-spacing: -0.02em; }
h3 { margin: 0; font-size: 1rem; }
.eyebrow { margin: 0 0 7px; color: var(--primary); font-size: 0.75rem; font-weight: 850; letter-spacing: 0.14em; text-transform: uppercase; }
.muted { color: var(--text-soft); }
.page-heading { margin-bottom: 28px; }
.page-heading > p:last-child { margin: 10px 0 0; }
.heading-actions { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; }
.button-row { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }

.button { appearance: none; display: inline-flex; min-height: 42px; align-items: center; justify-content: center; gap: 7px; border: 1px solid transparent; border-radius: 10px; padding: 9px 15px; font-weight: 750; line-height: 1.2; text-decoration: none; cursor: pointer; transition: transform 120ms ease, background 120ms ease, border-color 120ms ease; }
.button:hover { transform: translateY(-1px); text-decoration: none; }
.button:active { transform: translateY(0); }
.button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, .nav-toggle:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 28%, transparent); outline-offset: 2px; }
.button-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.button-primary:hover { background: var(--primary-strong); color: #fff; border-color: var(--primary-strong); }
.button-secondary { background: var(--surface); color: var(--primary-strong); border-color: var(--line); }
.button-secondary:hover { background: var(--surface-soft); }
.button-quiet { background: transparent; color: var(--text-soft); padding-inline: 10px; }
.button-quiet:hover { background: var(--surface-soft); color: var(--text); }
.button-danger-quiet { background: transparent; color: var(--danger); border-color: color-mix(in srgb, var(--danger) 25%, var(--line)); }
.button-danger-quiet:hover { background: var(--danger-soft); color: var(--danger); }
.button-wide { width: 100%; }
.button-small { min-height: 34px; padding: 6px 10px; font-size: 0.84rem; }

.panel, .metric-card, .auth-card, .error-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel { padding: 22px; }
.panel-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.panel-heading p { margin: 4px 0 0; color: var(--text-soft); font-size: 0.9rem; }
.panel-heading > a { font-weight: 750; }

.flash-stack { display: grid; gap: 10px; margin-bottom: 20px; }
.flash { display: flex; align-items: center; justify-content: space-between; gap: 16px; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; background: var(--surface); box-shadow: 0 8px 20px rgba(25, 61, 57, 0.06); }
.flash-success { border-color: color-mix(in srgb, var(--success) 30%, var(--line)); background: var(--success-soft); }
.flash-error { border-color: color-mix(in srgb, var(--danger) 30%, var(--line)); background: var(--danger-soft); }
.flash-close { width: 30px; height: 30px; border: 0; border-radius: 8px; background: transparent; color: inherit; font-size: 1.25rem; cursor: pointer; }
.flash-close:hover { background: rgba(0, 0, 0, 0.06); }

.safety-alert { display: grid; gap: 3px; margin-bottom: 16px; padding: 14px 16px; border-radius: 12px; border: 1px solid; }
.safety-danger { background: var(--danger-soft); border-color: color-mix(in srgb, var(--danger) 32%, var(--line)); color: color-mix(in srgb, var(--danger) 85%, var(--text)); }

.period-tabs { display: inline-flex; flex-wrap: wrap; gap: 4px; margin-bottom: 18px; padding: 4px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.period-tabs a { padding: 7px 12px; border-radius: 8px; color: var(--text-soft); text-decoration: none; font-size: 0.9rem; font-weight: 700; }
.period-tabs a[aria-current="page"], .period-tabs a:hover { background: var(--primary-soft); color: var(--primary-strong); }

.metric-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 15px; margin-bottom: 18px; }
.metric-card { min-height: 164px; padding: 20px; }
.metric-label { margin: 0; color: var(--text-soft); font-size: 0.83rem; font-weight: 750; }
.metric-value { margin: 15px 0 12px; font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 820; line-height: 1; letter-spacing: -0.05em; font-variant-numeric: tabular-nums; }
.metric-value span { font-size: 0.48em; color: var(--text-soft); font-weight: 720; letter-spacing: -0.01em; }
.metric-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; color: var(--text-soft); font-size: 0.76rem; }
.metric-detail { margin: 0; color: var(--text-soft); font-size: 0.78rem; }
.metric-compact .metric-value { margin-bottom: 10px; }
.empty-value { margin: 26px 0 0; color: var(--text-soft); font-weight: 700; }
.badge { display: inline-flex; align-items: center; width: max-content; border-radius: 999px; padding: 3px 8px; font-size: 0.7rem; font-weight: 820; line-height: 1.4; white-space: nowrap; }
.badge-success { color: var(--success); background: var(--success-soft); }
.badge-danger { color: var(--danger); background: var(--danger-soft); }
.badge-warning { color: var(--warning); background: var(--warning-soft); }
.badge-caution { color: var(--caution); background: var(--caution-soft); }
.badge-neutral { color: var(--text-soft); background: var(--neutral-soft); }

.chart-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-bottom: 18px; }
.chart-panel { min-width: 0; }
.chart-wrap { position: relative; min-height: 260px; }
.chart-wrap canvas { display: block; width: 100%; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 12px; color: var(--text-soft); font-size: 0.75rem; font-weight: 700; }
.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend span::before { content: ""; width: 18px; height: 3px; border-radius: 2px; background: currentColor; }
.legend-systolic { color: var(--chart-systolic); }
.legend-diastolic { color: var(--chart-diastolic); }
.legend-sugar { color: var(--chart-sugar); }
.chart-tooltip { position: absolute; z-index: 4; display: grid; gap: 2px; max-width: 220px; padding: 9px 11px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); box-shadow: 0 8px 24px rgba(23, 48, 45, 0.16); color: var(--text); font-size: 0.76rem; pointer-events: none; }
.chart-tooltip strong { margin-bottom: 3px; }
.chart-tooltip[hidden] { display: none; }
.chart-empty { min-height: 220px; display: grid; place-items: center; color: var(--text-soft); text-align: center; }
.chart-empty[hidden] { display: none; }

.two-column-layout { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(320px, 0.82fr); gap: 18px; align-items: start; }
.recent-list { display: grid; }
.recent-item { display: grid; grid-template-columns: 88px 1fr auto; align-items: center; gap: 12px; padding: 12px 4px; border-top: 1px solid var(--line); color: var(--text); text-decoration: none; }
.recent-item:first-child { border-top: 0; padding-top: 2px; }
.recent-item:hover { color: var(--primary); }
.recent-item time, .recent-item time span { display: block; }
.recent-item time span { color: var(--text-soft); font-size: 0.75rem; }
.recent-measures { display: flex; flex-wrap: wrap; gap: 8px 14px; font-weight: 780; }
.recent-measures small { color: var(--text-soft); font-weight: 600; }

label { display: grid; gap: 6px; color: var(--text); font-size: 0.86rem; font-weight: 700; }
label > small { color: var(--text-soft); font-weight: 500; }
input, select, textarea { width: 100%; min-height: 44px; border: 1px solid #c9d7d4; border-radius: 10px; background: var(--surface); color: var(--text); padding: 9px 11px; }
textarea { resize: vertical; min-height: 90px; }
input::placeholder, textarea::placeholder { color: #8b9b98; }
.input-unit { display: flex; align-items: center; border: 1px solid #c9d7d4; border-radius: 10px; background: var(--surface); overflow: hidden; }
.input-unit:focus-within { outline: 3px solid color-mix(in srgb, var(--primary) 28%, transparent); outline-offset: 2px; border-color: var(--primary); }
.input-unit input { border: 0; border-radius: 0; outline: 0 !important; }
.input-unit small { padding-right: 11px; color: var(--text-soft); font-size: 0.73rem; white-space: nowrap; }
.reading-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; }
.compact-reading-form { box-shadow: none; border: 0; padding: 0; }
.field-full { grid-column: 1 / -1; }
.form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 4px; }
.full-reading-form { max-width: 920px; padding: 0; overflow: hidden; }
.form-section { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 15px; padding: 24px; border-bottom: 1px solid var(--line); }
.form-section .section-heading { grid-column: 1 / -1; }
.section-heading p { margin: 4px 0 0; color: var(--text-soft); font-size: 0.85rem; }
.full-reading-form > .form-actions { grid-column: 1 / -1; padding: 20px 24px; margin: 0; }
.stack-form { display: grid; gap: 15px; }
.form-errors { margin-bottom: 18px; padding: 14px 16px; border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--line)); border-radius: 12px; background: var(--danger-soft); color: color-mix(in srgb, var(--danger) 85%, var(--text)); }
.form-errors p, .form-errors ul { margin: 0; }
.form-errors ul { padding-left: 20px; }

.filter-bar { display: grid; grid-template-columns: 150px 150px 180px minmax(210px, 1fr) auto; gap: 12px; align-items: end; margin-bottom: 18px; padding: 16px; box-shadow: none; }
.filter-actions { display: flex; align-items: center; gap: 6px; }
.table-panel { padding-inline: 0; overflow: hidden; }
.table-panel > .panel-heading { padding-inline: 22px; }
.table-scroll { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.data-table th { padding: 10px 14px; background: var(--surface-soft); color: var(--text-soft); font-size: 0.72rem; font-weight: 820; letter-spacing: 0.04em; text-align: left; text-transform: uppercase; white-space: nowrap; }
.data-table td { padding: 14px; border-top: 1px solid var(--line); vertical-align: top; }
.data-table time span { display: block; color: var(--text-soft); font-size: 0.76rem; white-space: nowrap; }
.data-table small { color: var(--text-soft); }
.notes-cell { min-width: 180px; max-width: 320px; color: var(--text-soft); }
.table-actions { display: flex; align-items: center; justify-content: flex-end; gap: 6px; white-space: nowrap; }
.table-actions form { display: inline-flex; }
.pagination { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 15px; padding: 18px 22px 0; border-top: 1px solid var(--line); }
.pagination > :last-child { justify-self: end; }
.pagination > span:nth-child(2) { color: var(--text-soft); font-size: 0.86rem; }
.empty-state { min-height: 250px; display: grid; place-items: center; align-content: center; gap: 8px; padding: 30px; text-align: center; color: var(--text-soft); }
.empty-state h3, .empty-state p { margin: 0; }
.compact-empty { min-height: 150px; }

.settings-layout { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.55fr); gap: 18px; align-items: start; }
.settings-form { display: grid; gap: 24px; }
.settings-section { display: grid; gap: 14px; padding-top: 20px; border-top: 1px solid var(--line); }
.settings-form > .panel-heading + .settings-section { padding-top: 0; border-top: 0; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.threshold-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.threshold-grid label { grid-template-columns: minmax(0, 1fr) 88px; align-items: center; }
.threshold-grid label span { font-size: 0.8rem; }
.threshold-grid label small { grid-column: 2; text-align: right; }
.threshold-grid input { text-align: right; }
.settings-sidebar { display: grid; gap: 18px; }
.source-list { display: grid; gap: 9px; margin: 0 0 16px; padding-left: 18px; font-size: 0.88rem; }
.fine-print { color: var(--text-soft); font-size: 0.78rem; }
.stack-actions { display: grid; gap: 10px; }

.admin-users-layout { display: grid; grid-template-columns: minmax(280px, 0.42fr) minmax(0, 0.58fr); gap: 18px; align-items: start; }
.create-user-panel { position: sticky; top: 96px; }
.user-directory { display: grid; gap: 12px; }
.user-card { display: grid; gap: 14px; padding: 17px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-soft); }
.user-card-disabled { border-style: dashed; }
.user-card-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.user-card-heading h3 { font-size: 1.05rem; }
.user-card-heading p { margin: 4px 0 0; color: var(--text-soft); font-size: 0.8rem; }
.user-badges { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px; }
.user-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.user-actions form { display: inline-flex; }
.user-self-note { margin: 0; }
.password-reset { border-top: 1px solid var(--line); padding-top: 12px; }
.password-reset summary { width: max-content; color: var(--primary); font-size: 0.84rem; font-weight: 750; cursor: pointer; }
.password-reset summary:hover { color: var(--primary-strong); }
.password-reset-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; align-items: end; margin-top: 12px; }
.password-reset-form .button { grid-column: 1 / -1; justify-self: start; }
.user-privacy-note { margin-top: 18px; }
.user-privacy-note p { margin: 8px 0 0; color: var(--text-soft); }

.upload-form { min-height: 280px; }
.file-input input { padding: 8px; }
.checkbox-label { display: flex; grid-template-columns: auto 1fr; align-items: center; gap: 9px; font-weight: 600; }
.checkbox-label input { width: 18px; height: 18px; min-height: 0; }
.prose-panel h2, .prose-panel h3 { margin-bottom: 8px; }
.prose-panel h3 { margin-top: 24px; }
.prose-panel ol { padding-left: 20px; }
.prose-panel li + li { margin-top: 8px; }

.auth-card { width: min(440px, 100%); padding: clamp(28px, 6vw, 42px); }
.auth-card h1 { font-size: 2.2rem; }
.auth-card > .muted { margin: 10px 0 24px; }
.auth-brand { width: 52px; height: 52px; margin-bottom: 22px; border-radius: 16px; font-size: 34px; box-shadow: 0 12px 28px rgba(37, 108, 100, 0.25); }
.auth-note { margin: 20px 0 0; color: var(--text-soft); font-size: 0.76rem; text-align: center; }
.error-card { max-width: 650px; margin: 8vh auto 0; padding: clamp(28px, 5vw, 46px); text-align: center; }
.error-card > p:not(.eyebrow) { color: var(--text-soft); }
.error-card .button-row { justify-content: center; margin-top: 24px; }
.error-icon { display: grid; place-items: center; width: 54px; height: 54px; margin: 0 auto 18px; border-radius: 16px; background: var(--danger-soft); color: var(--danger); font-size: 1.6rem; font-weight: 900; }

@media (max-width: 1000px) {
  .metric-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chart-grid, .two-column-layout, .settings-layout, .admin-users-layout { grid-template-columns: 1fr; }
  .create-user-panel { position: static; }
  .filter-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .filter-search { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .shell { width: min(100% - 24px, 1180px); }
  .main-content { padding-block: 26px 52px; }
  .nav-toggle { display: inline-flex; }
  .primary-nav { position: absolute; left: 12px; right: 12px; top: 62px; display: none; padding: 10px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); box-shadow: var(--shadow); }
  .primary-nav.is-open { display: grid; }
  .primary-nav > a { padding: 11px 12px; }
  .nav-logout { margin: 4px 0 0; border-top: 1px solid var(--line); padding-top: 6px; }
  .nav-logout .button { width: 100%; justify-content: flex-start; }
  .heading-actions { align-items: flex-start; flex-direction: column; }
  .heading-actions > .button, .heading-actions > .button-row { width: 100%; }
  .heading-actions > .button { justify-content: center; }
  .button-row .button { flex: 1; }
  .metric-grid { grid-template-columns: 1fr; }
  .metric-card { min-height: 145px; }
  .period-tabs { width: 100%; display: grid; grid-template-columns: repeat(5, 1fr); }
  .period-tabs a { padding-inline: 5px; text-align: center; font-size: 0.76rem; }
  .panel { padding: 18px; }
  .panel-heading { flex-direction: column; gap: 8px; }
  .reading-form, .form-section, .form-grid, .threshold-grid, .password-reset-form { grid-template-columns: 1fr; }
  .user-card-heading { flex-direction: column; }
  .user-badges { justify-content: flex-start; }
  .user-actions { display: grid; }
  .user-actions form, .user-actions .button { width: 100%; }
  .password-reset-form .button { grid-column: auto; width: 100%; }
  .form-section { padding: 20px; }
  .threshold-grid label { grid-template-columns: minmax(0, 1fr) 90px; }
  .filter-bar { grid-template-columns: 1fr; }
  .filter-search { grid-column: auto; }
  .filter-actions .button { flex: 1; }
  .table-panel { padding: 16px; }
  .table-panel > .panel-heading { padding-inline: 0; }
  .table-scroll { overflow: visible; }
  .data-table, .data-table tbody { display: block; }
  .data-table thead { display: none; }
  .data-table tr { display: grid; gap: 8px; padding: 15px 0; border-top: 1px solid var(--line); }
  .data-table tr:first-child { border-top: 0; }
  .data-table td { display: grid; grid-template-columns: minmax(100px, 0.42fr) minmax(0, 0.58fr); gap: 10px; padding: 0; border: 0; text-align: right; }
  .data-table td::before { content: attr(data-label); color: var(--text-soft); font-size: 0.72rem; font-weight: 800; text-align: left; text-transform: uppercase; }
  .data-table .table-actions { display: flex; justify-content: flex-end; margin-top: 5px; }
  .data-table .table-actions::before { display: none; }
  .notes-cell { max-width: none; }
  .pagination { padding-inline: 0; }
  .footer-wrap { min-height: 90px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 4px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #10201e;
    --surface: #172b28;
    --surface-soft: #1d3531;
    --surface-strong: #284640;
    --text: #edf6f4;
    --text-soft: #a9c0bc;
    --line: #2c4944;
    --primary: #65b8ad;
    --primary-strong: #8ed0c8;
    --primary-soft: #203f3a;
    --danger: #f09aa2;
    --danger-soft: #47292e;
    --warning: #e6ba6b;
    --warning-soft: #48391f;
    --caution: #ddd071;
    --caution-soft: #403d24;
    --success: #84d4aa;
    --success-soft: #244334;
    --neutral-soft: #2a3e3b;
    --shadow: 0 16px 42px rgba(0, 0, 0, 0.25);
    --chart-grid: #34504c;
    --chart-text: #a9c0bc;
  }
  input, select, textarea, .input-unit { border-color: #3a5954; }
  input::placeholder, textarea::placeholder { color: #78918d; }
}

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