:root {
    --bg: #f4f6f5;
    --surface: #ffffff;
    --text: #1c2421;
    --muted: #5f6b66;
    --border: #dde3e0;
    --accent: #0f766e;
    --accent-strong: #0b5c56;
    --accent-soft: #e0f2ef;
    --good: #15803d;
    --bad: #b45309;
    --danger: #b91c1c;
    --radius: 14px;
    --shadow: 0 1px 2px rgba(0, 0, 0, .05), 0 4px 16px rgba(0, 0, 0, .04);
    --tabbar-height: 64px;
    color-scheme: light;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111615;
        --surface: #1a211f;
        --text: #e6ece9;
        --muted: #9aa7a1;
        --border: #2c3532;
        --accent: #2dd4bf;
        --accent-strong: #5eead4;
        --accent-soft: #123a36;
        --good: #4ade80;
        --bad: #fbbf24;
        --danger: #f87171;
        --shadow: none;
        color-scheme: dark;
    }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    padding-bottom: calc(var(--tabbar-height) + env(safe-area-inset-bottom, 0px) + 16px);
}

body.centered {
    display: grid;
    place-items: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 16px;
}

a { color: var(--accent); }

h1 { font-size: 1.6rem; line-height: 1.2; margin: 8px 0 16px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }

.muted { color: var(--muted); }
.small { font-size: .875rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* header and navigation ------------------------------------------------------------------------------------------ */

.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 16px;
    padding-top: calc(10px + env(safe-area-inset-top, 0px));
    padding-left: max(16px, env(safe-area-inset-left, 0px));
    padding-right: max(16px, env(safe-area-inset-right, 0px));
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}
.brand img { border-radius: 7px; }

.account { margin-left: auto; display: flex; align-items: center; gap: 12px; font-size: .9rem; }
.account form { margin: 0; }
.account-name { color: var(--muted); text-decoration: none; max-width: 40vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.link-button {
    background: none;
    border: none;
    padding: 0;
    color: var(--accent);
    font: inherit;
    cursor: pointer;
    min-height: auto;
}

/* mobile: tabs as bottom bar like a native app */
.tabs {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    z-index: 10;
}
.tabs a {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    height: var(--tabbar-height);
    color: var(--muted);
    text-decoration: none;
    font-size: .75rem;
}
.tabs a.active { color: var(--accent); font-weight: 600; }
.tabs svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

@media (min-width: 760px) {
    body { padding-bottom: 32px; }
    .tabs {
        position: static;
        border: none;
        padding: 0;
        gap: 4px;
        background: none;
    }
    .tabs a {
        flex: none;
        flex-direction: row;
        height: auto;
        padding: 8px 12px;
        border-radius: 10px;
        font-size: .95rem;
        gap: 6px;
    }
    .tabs a:hover { background: var(--accent-soft); }
    .tabs a.active { background: var(--accent-soft); }
    .tabs svg { width: 18px; height: 18px; }
}

.subnav { display: flex; gap: 8px; margin: 8px 0 16px; flex-wrap: wrap; }
.subnav a {
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid var(--border);
    text-decoration: none;
    color: var(--text);
    background: var(--surface);
}
.subnav a.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* layout -------------------------------------------------------------------------------------------------------- */

.container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 16px;
    padding-left: max(16px, env(safe-area-inset-left, 0px));
    padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.container.narrow { max-width: 480px; }

.grid { display: grid; gap: 16px; }
@media (min-width: 760px) {
    .grid { grid-template-columns: 1fr 1fr; }
    .grid > .weigh-card { grid-row: span 2; }
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 16px;
}
.grid > .card { margin-bottom: 0; }

.auth-card {
    width: 100%;
    max-width: 380px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px 24px;
    text-align: center;
}
.auth-card img { border-radius: 14px; }
.auth-card h1 { margin: 8px 0 4px; }
.auth-card form { text-align: left; margin-top: 20px; }

/* forms --------------------------------------------------------------------------------------------------------- */

.stack { display: grid; gap: 14px; }

label { display: grid; gap: 4px; font-size: .9rem; font-weight: 500; }
label.checkbox { display: flex; align-items: center; gap: 8px; font-weight: 400; }

input, select {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    font: inherit;
    font-size: 16px; /* prevents zoom on iOS */
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
}
input[type=checkbox] { width: 20px; min-height: 20px; height: 20px; accent-color: var(--accent); }
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }

button, .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 10px 18px;
    font: inherit;
    font-weight: 600;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
}
button:hover, .button:hover { border-color: var(--accent); }
button.primary, .button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover, .button.primary:hover { background: var(--accent-strong); }
@media (prefers-color-scheme: dark) {
    button.primary, .button.primary { color: #06201d; }
}
button.danger { color: var(--danger); }
button.danger:hover { border-color: var(--danger); }
button:disabled { opacity: .6; cursor: default; }

.button-row { display: flex; gap: 8px; flex-wrap: wrap; }

.form-grid { display: grid; gap: 14px; }
@media (min-width: 640px) {
    .form-grid { grid-template-columns: 1fr 1fr; }
    .form-grid .full { grid-column: 1 / -1; }
}

/* weight entry */
.weigh-form { display: flex; gap: 10px; margin: 16px 0 8px; flex-wrap: wrap; }
.weight-input { position: relative; flex: 1 1 160px; }
.weight-input input { font-size: 1.6rem; font-weight: 700; padding-right: 48px; min-height: 60px; }
.weight-input .unit { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); color: var(--muted); font-weight: 600; }
.weigh-form button { min-height: 60px; flex: 1 1 120px; font-size: 1.05rem; }

/* alerts -------------------------------------------------------------------------------------------------------- */

.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; border: 1px solid; }
.alert.success { background: color-mix(in srgb, var(--good) 12%, var(--surface)); border-color: color-mix(in srgb, var(--good) 35%, transparent); }
.alert.error { background: color-mix(in srgb, var(--danger) 12%, var(--surface)); border-color: color-mix(in srgb, var(--danger) 35%, transparent); }
.alert.info { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.notice { background: var(--accent-soft); padding: 12px 14px; border-radius: 10px; }
code.password { font-size: 1.15rem; padding: 2px 8px; background: var(--surface); border-radius: 6px; user-select: all; }

/* statistics ---------------------------------------------------------------------------------------------------- */

.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 16px; }
.kpi { display: grid; gap: 2px; }
.kpi .label { font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.kpi .value { font-size: 1.5rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.kpi .sub { font-size: .85rem; color: var(--muted); }

.good { color: var(--good); }
.bad { color: var(--bad); }

.more { display: inline-block; margin-top: 12px; font-weight: 600; text-decoration: none; }

.chart-box { position: relative; height: 280px; }

.table-wrap { overflow-x: auto; margin: 0 -20px; padding: 0 20px; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { padding: 10px 8px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
th { font-size: .8rem; color: var(--muted); font-weight: 600; }
td.num, th.num { text-align: right; }
td small { display: block; font-size: .78rem; opacity: .8; }

.greeting { margin-bottom: 16px; }

/* admin --------------------------------------------------------------------------------------------------------- */

.user-list, .entry-list { list-style: none; margin: 0; padding: 0; }
.user-list li, .entry-list li {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
}
.user-list li:last-child, .entry-list li:last-child { border-bottom: none; }
.user-info { flex: 1 1 220px; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 8px; }
.user-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: flex-start; }
.user-actions form { margin: 0; }
.user-actions .button, .user-actions button { min-height: 38px; padding: 6px 12px; font-size: .9rem; }

.badge { font-size: .72rem; font-weight: 600; padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.badge.warn { background: color-mix(in srgb, var(--bad) 15%, var(--surface)); color: var(--bad); }

details.inline-form { position: relative; }
details.inline-form summary { list-style: none; }
details.inline-form summary::-webkit-details-marker { display: none; }
details.inline-form[open] form {
    margin-top: 8px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--bg);
    min-width: min(280px, 80vw);
}

.entry-list li {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px 12px;
}
.entry-person { font-weight: 600; align-self: center; }
.entry-list form { margin: 0; }
.entry-edit {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 6.5rem auto;
    gap: 8px;
}
.entry-list input { min-height: 40px; padding: 6px 10px; }
.entry-list button { min-height: 40px; padding: 6px 12px; font-size: .9rem; }
@media (min-width: 760px) {
    .entry-list li { grid-template-columns: 200px minmax(0, 1fr) auto; }
    .entry-edit { grid-column: 2; grid-row: 1; grid-template-columns: 11rem 7rem auto; justify-content: start; }
}

.entry-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: end; }
.entry-form label { flex: 1 1 140px; }

.filter { max-width: 360px; }

/* calendar subscription --------------------------------------------------------------------------------------- */

.calendar-card .button-row { margin: 14px 0; }
.copy-field { font-weight: 400; color: var(--muted); font-size: .85rem; }
.copy-row { display: flex; gap: 8px; }
.copy-row input { font-size: .85rem; min-width: 0; }
.help { margin-top: 12px; font-size: .875rem; color: var(--muted); }
.help summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.help ul { padding-left: 18px; margin: 8px 0 0; display: grid; gap: 6px; }