:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1c2029;
  --ink: #e7ebf3;
  --muted: #8a93a6;
  --accent: #6ee7ff;
  --border: #232836;
  --cs-clean: #7ee787;
  --cs-drinking: #ff8585;
  --err: #ff8585;
}
:root.light {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --panel-2: #f5f7fa;
  --ink: #1a1f2b;
  --muted: #5a6478;
  --accent: #0a8fb8;
  --border: #e1e6ee;
  --cs-clean: #1f8f3d;
  --cs-drinking: #c92a2a;
  --err: #c92a2a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  transition: background 200ms ease, color 200ms ease;
}

/* ---- header ---- */

header {
  padding: 28px 32px 8px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
header .titles h1 { margin: 0 0 4px; font-size: 22px; font-weight: 600; letter-spacing: -0.01em; }
header .titles p { margin: 0; color: var(--muted); font-size: 14px; }

.theme-toggle {
  flex-shrink: 0;
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 150ms ease, color 150ms ease, background 150ms ease;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 16px; height: 16px; display: block; }
.theme-toggle .icon-moon { display: none; }
:root.light .theme-toggle .icon-sun { display: none; }
:root.light .theme-toggle .icon-moon { display: block; }

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

main {
  padding: 20px 32px 48px;
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}
@media (min-width: 1000px) {
  main { grid-template-columns: 1fr 1fr; }
  .wide { grid-column: 1 / -1; }
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  transition: background 200ms ease, border-color 200ms ease;
}
.card h2 { margin: 0 0 4px; font-size: 14px; font-weight: 600; color: var(--ink); }
.card .sub { margin: 0 0 14px; font-size: 12px; color: var(--muted); }

.chart-wrap { position: relative; height: 320px; }

/* ---- top stats bar ---- */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}
.stat, .hl { transition: background 200ms ease, border-color 200ms ease; }
.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
}
.stat .n { font-size: 22px; font-weight: 600; color: var(--accent); }
.stat .l { font-size: 12px; color: var(--muted); margin-top: 2px; }
.stat .m { font-size: 11px; color: var(--muted); margin-top: 4px; opacity: 0.85; }

/* ---- lowlights grid ---- */

.highlights {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  align-content: start;
}
.hl {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 78px;
}
.hl .label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.hl .value { font-size: 15px; font-weight: 600; color: var(--ink); line-height: 1.25; word-break: break-word; }
.hl .meta { font-size: 11px; color: var(--accent); margin-top: auto; }

/* ---- current streak ---- */

.current-streak { text-align: center; padding: 28px 20px; }
.current-streak .cs-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.current-streak .cs-value { font-size: 56px; font-weight: 700; line-height: 1.05; margin: 8px 0 4px; letter-spacing: -0.02em; }
.current-streak .cs-sub { font-size: 13px; color: var(--muted); }
.current-streak.is-clean .cs-value { color: var(--cs-clean); }
.current-streak.is-drinking .cs-value { color: var(--cs-drinking); }

.err { color: var(--err); padding: 24px 32px; }