/* =========================================================================
   Health Log — design system
   Direction: an instrument-panel read on heart-rhythm tracking. Deep
   midnight-navy base (not pure black), a phosphor-teal "trace" accent that
   nods to an ECG line, warm amber/gold for the two flagged extremes, and
   coral/slate for the Yes/No signal. Numerals run in monospace like a
   vitals readout; everything else in a plain system sans. A tiled
   heartbeat trace runs under the nav on every page as the throughline.
   ========================================================================= */

:root {
    /* Core surface + text */
    --ink: #0a1220;
    --panel: #121c30;
    --panel-raised: #1c2a45;
    --border: rgba(237, 241, 247, 0.09);
    --border-strong: rgba(237, 241, 247, 0.16);
    --text: #edf1f7;
    --text-dim: #8b9bb8;

    /* Signature accent */
    --trace: #3ddc97;
    --trace-ink: #04140d;

    /* Semantic accents */
    --alert: #ff6b5b;
    --calm: #7c8db5;
    --min-hl: #ffb84d;
    --max-hl: #f4d35e;

    --radius: 12px;
    --radius-sm: 8px;
    --font-display: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

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

body {
    background: var(--ink);
    color: var(--text);
    font-family: var(--font-display);
    font-size: 15px;
    line-height: 1.5;
    margin: 0;
    padding: 0;
}

a { color: inherit; }

::selection { background: var(--trace); color: var(--trace-ink); }

/* ---- Baseline trace strip (the throughline, on every page) ---- */
.baseline-trace {
    height: 22px;
    width: 100%;
    opacity: 0.55;
    background-repeat: repeat-x;
    background-size: 92px 22px;
    background-position: center;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='92' height='22' viewBox='0 0 92 22'%3E%3Cpath d='M0 11 H26 L33 3 L40 19 L47 1 L54 21 L61 11 H92' fill='none' stroke='%233ddc97' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

/* ---- Top nav ---- */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1080px;
    margin: 0 auto;
    padding: 18px 20px 14px;
    flex-wrap: wrap;
    gap: 12px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
}

.brand-mark {
    width: 30px;
    height: 30px;
    border-radius: 9px;
    background: var(--panel);
    border: 1px solid var(--border-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
}

.brand-mark svg { width: 18px; height: 18px; display: block; }

.brand-word {
    font-weight: 700;
    font-size: 17px;
    letter-spacing: -0.01em;
}

.navbar {
    display: flex;
    gap: 22px;
    flex-wrap: wrap;
}

.nav-btn {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 13.5px;
    font-weight: 600;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-btn:hover { color: var(--text); }
.nav-btn.active { color: var(--trace); border-color: var(--trace); }

.page {
    max-width: 1080px;
    margin: 0 auto;
    padding: 20px 20px 56px;
}

/* ---- Headings ---- */
h1 {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.015em;
    margin: 6px 0 2px;
    text-align: center;
}

h2.section-title {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--trace);
    text-align: center;
    margin: 30px 0 12px;
}

.subtitle {
    text-align: center;
    font-size: 14px;
    color: var(--text-dim);
    margin: 0 0 30px;
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 9px 18px;
    font-size: 13.5px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover { background: var(--panel-raised); border-color: var(--border-strong); }

.btn.primary {
    background: var(--trace);
    color: var(--trace-ink);
    border-color: var(--trace);
}
.btn.primary:hover { background: #34c987; border-color: #34c987; }

.btn-row { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin: 4px 0 22px; }

/* ---- Home hero ---- */
.hero { text-align: center; padding: 18px 0 6px; }
.hero-trace { width: 100%; max-width: 640px; height: 90px; margin: 18px auto 8px; display: block; }
.hero-trace path {
    stroke-dasharray: 900;
    stroke-dashoffset: 900;
    animation: draw-trace 1.6s ease-out 0.15s forwards;
}
@media (prefers-reduced-motion: reduce) {
    .hero-trace path { animation: none; stroke-dashoffset: 0; }
}
@keyframes draw-trace { to { stroke-dashoffset: 0; } }

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    max-width: 720px;
    margin: 26px auto 0;
}

.nav-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 16px;
    text-decoration: none;
    color: var(--text);
    text-align: center;
    transition: border-color 0.15s ease, transform 0.15s ease, background 0.15s ease;
}
.nav-card:hover { border-color: var(--trace); background: var(--panel-raised); transform: translateY(-2px); }
.nav-card svg { width: 26px; height: 26px; margin-bottom: 10px; color: var(--trace); }
.nav-card .card-title { font-weight: 700; font-size: 14px; }
.nav-card .card-sub { font-size: 12px; color: var(--text-dim); margin-top: 4px; }

@media (max-width: 640px) {
    .card-grid { grid-template-columns: 1fr; }
}

/* ---- Sub-nav (Graphs tabs) ---- */
.subnav {
    display: flex;
    justify-content: center;
    gap: 22px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
    margin: 4px 0 24px;
    padding-bottom: 0;
}
.subnav a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    padding: 0 0 10px;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.15s ease, border-color 0.15s ease;
}
.subnav a.active { color: var(--trace); border-color: var(--trace); }
.subnav a:hover { color: var(--text); }

/* ---- Forms ---- */
.form-wrap {
    max-width: 440px;
    margin: 0 auto;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px 26px 20px;
}
.form-row { margin-bottom: 16px; }
.form-row label {
    display: block;
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 6px;
}

.field {
    width: 100%;
    background: var(--ink);
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-size: 14px;
    font-family: var(--font-mono);
}
.field:focus { outline: none; border-color: var(--trace); }

.toggle-group { display: flex; gap: 8px; }
.toggle-option { flex: 1; }
.toggle-option input { position: absolute; opacity: 0; pointer-events: none; }
.toggle-option label {
    display: block;
    text-align: center;
    background: var(--ink);
    color: var(--text-dim);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 9px 0;
    cursor: pointer;
    font-size: 13px;
    font-weight: 700;
    text-transform: none;
    letter-spacing: normal;
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.toggle-option input:checked + label.afib-yes-label { background: var(--alert); color: #2b0805; border-color: var(--alert); }
.toggle-option input:checked + label.afib-no-label { background: var(--calm); color: #0b1220; border-color: var(--calm); }
.toggle-option input:focus-visible + label { outline: 2px solid var(--trace); outline-offset: 2px; }

.status-msg {
    text-align: center;
    color: var(--trace);
    margin-top: 16px;
    font-size: 13.5px;
    font-weight: 600;
}
.error-box {
    max-width: 440px;
    margin: 0 auto 18px;
    background: rgba(255, 107, 91, 0.08);
    border: 1px solid var(--alert);
    border-radius: var(--radius);
    padding: 12px 16px;
    font-size: 13.5px;
}
.error-box strong { color: var(--alert); }
.error-box ul { margin: 6px 0 0; padding-left: 18px; }

/* ---- Legend ---- */
.legend { display: flex; justify-content: center; gap: 20px; margin-bottom: 14px; font-size: 12.5px; color: var(--text-dim); flex-wrap: wrap; }
.swatch { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: middle; }

/* ---- Log table ---- */
.log-table-wrap {
    max-height: 250px;
    overflow-y: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 22px;
}
table.log-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.log-table th {
    background: var(--panel-raised);
    color: var(--text-dim);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 10px 12px;
    text-align: center;
    position: sticky;
    top: 0;
}
table.log-table td {
    background: var(--panel);
    padding: 9px 12px;
    text-align: center;
    font-family: var(--font-mono);
    border-top: 1px solid var(--border);
}
table.log-table tr:hover td { background: var(--panel-raised); }

.cell-min { background: var(--min-hl) !important; color: #2b1600 !important; font-weight: 700; }
.cell-max { background: var(--max-hl) !important; color: #2b2400 !important; font-weight: 700; }
table.log-table tr:hover td.cell-min { background: var(--min-hl) !important; }
table.log-table tr:hover td.cell-max { background: var(--max-hl) !important; }

.afib-yes { color: var(--alert); font-weight: 700; }
.afib-no { color: var(--calm); }

.row-actions { display: flex; gap: 6px; justify-content: center; }

.delete-btn {
    display: inline-block;
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 4px 10px;
    font-size: 11px;
    font-family: var(--font-display);
    text-decoration: none;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.delete-btn:hover { background: var(--alert); color: #2b0805; border-color: var(--alert); }

a.delete-btn:hover { background: var(--trace); color: var(--trace-ink); border-color: var(--trace); }

/* ---- Vitals strip (averages panel) ---- */
.vitals-strip {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    max-width: 900px;
    margin: 0 auto 24px;
}
.vital-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 12px;
    text-align: center;
}
.vital-card .vital-label {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 6px;
}
.vital-card .vital-value {
    font-family: var(--font-mono);
    font-size: 19px;
    font-weight: 700;
    color: var(--text);
}
.vital-card .vital-sub {
    font-size: 10.5px;
    color: var(--text-dim);
    margin-top: 4px;
}

@media (max-width: 760px) {
    .vitals-strip { grid-template-columns: repeat(2, 1fr); }
}

/* ---- Chart / grid controls ---- */
.controls { display: flex; justify-content: center; align-items: center; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; }
.controls label { font-size: 12.5px; color: var(--text-dim); font-weight: 600; }
.controls select {
    background: var(--panel);
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-size: 13px;
    font-family: var(--font-mono);
}

.summary-line { text-align: center; font-size: 13.5px; color: var(--text-dim); margin-bottom: 14px; }
.summary-line strong { color: var(--text); }

.chart-card {
    max-width: 920px;
    margin: 0 auto 26px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    overflow-x: auto;
    text-align: center;
}
.chart-card img { display: inline-block; border-radius: var(--radius-sm); }

/* ---- Monthly grid ---- */
.grid-wrap {
    max-width: 100%;
    overflow: auto;
    max-height: 440px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
table.month-grid { border-collapse: collapse; font-size: 12px; font-family: var(--font-mono); }
table.month-grid th, table.month-grid td {
    border: 1px solid var(--border);
    padding: 6px 9px;
    text-align: center;
    white-space: nowrap;
}
table.month-grid th {
    background: var(--panel-raised);
    color: var(--text-dim);
    font-weight: 700;
    position: sticky;
    top: 0;
    font-family: var(--font-display);
    font-size: 11px;
}
table.month-grid th.time-col, table.month-grid td.time-col {
    position: sticky;
    left: 0;
    background: var(--panel-raised);
    z-index: 1;
}
table.month-grid td { background: var(--panel); color: var(--text-dim); }
table.month-grid td.yes-cell { color: var(--alert); font-weight: 700; }

@media (max-width: 640px) {
    .form-row label { text-align: left; }
    .vitals-strip { grid-template-columns: 1fr 1fr; }
    .topbar { justify-content: center; text-align: center; }
    .navbar { justify-content: center; }
}