:root {
  --ink: #173b38;
  --muted: #6d817e;
  --paper: #fbfdfc;
  --surface: #ffffff;
  --line: #dce9e6;
  --soft: #eef8f6;
  --mint: #2fc8b3;
  --mint-dark: #0b766e;
  --mint-deep: #075850;
  --warning: #b86b21;
  --warning-soft: #fff5e8;
  --shadow: 0 22px 60px rgba(20, 72, 67, 0.1);
  color-scheme: light;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { min-width: 1040px; height: 100%; background: var(--paper); }

body {
  margin: 0;
  height: 100%;
  display: grid;
  grid-template-rows: 88px minmax(0, 1fr) 40px;
  overflow: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 5%, rgba(47, 200, 179, 0.13), transparent 28rem),
    linear-gradient(180deg, #f8fcfb 0, var(--paper) 24rem);
}

a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }

.site-header,
.site-footer,
main {
  width: min(1440px, calc(100% - 72px));
  margin-inline: auto;
}

.site-header {
  height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  color: white;
  background: var(--mint-dark);
  box-shadow: 0 8px 22px rgba(11, 118, 110, 0.22);
  font-size: 20px;
  font-weight: 900;
}

.brand strong,
.brand small { display: block; }
.brand strong { font-family: Georgia, serif; font-size: 21px; letter-spacing: -0.02em; }
.brand small { margin-top: 3px; color: var(--muted); font-size: 12px; }

.github-link,
.sidebar-edit,
.proof-nav a {
  color: var(--mint-dark);
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
}

.github-link:hover,
.sidebar-edit:hover,
.proof-nav a:hover { color: var(--mint-deep); text-decoration: underline; }

.app-shell {
  height: 100%;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.93);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.app-shell:has(.habit-sidebar) {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
}

.habit-sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 34px 25px 25px;
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, #f4fbf9, #eef8f6);
}

.sidebar-heading,
.calendar-header,
.proof-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.section-kicker {
  margin: 0 0 7px;
  color: var(--mint-dark);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.sidebar-heading h1,
.calendar-header h2,
.proof-header h1,
.empty-state h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
  letter-spacing: -0.035em;
}

.sidebar-heading h1 { font-size: 31px; }

.icon-button {
  display: grid;
  place-items: center;
  width: 37px;
  height: 37px;
  border-radius: 12px;
  color: white;
  background: var(--mint-dark);
  text-decoration: none;
  font-size: 23px;
  line-height: 1;
  box-shadow: 0 8px 18px rgba(11, 118, 110, 0.18);
}

.habit-list {
  display: grid;
  gap: 7px;
  margin-top: 29px;
}

.habit-option {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 13px 14px;
  border: 1px solid transparent;
  border-radius: 13px;
  color: #45605d;
  background: transparent;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  font-weight: 700;
}

.habit-option:hover { background: rgba(255, 255, 255, 0.68); }

.habit-option.is-selected {
  border-color: #bde4de;
  color: var(--mint-deep);
  background: white;
  box-shadow: 0 7px 20px rgba(25, 91, 84, 0.08);
}

.habit-option-mark {
  width: 9px;
  height: 9px;
  border: 2px solid #91aaa6;
  border-radius: 50%;
}

.habit-option.is-selected .habit-option-mark {
  border-color: var(--mint-dark);
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(47, 200, 179, 0.15);
}

.sidebar-edit { margin-top: auto; padding: 14px; }

.calendar-panel {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 27px 39px 25px;
  overflow: hidden;
}
.calendar-header { align-items: flex-end; margin-bottom: 27px; }
.calendar-header h2 { font-size: 38px; line-height: 1.06; }
.calendar-summary { margin: 8px 0 0; color: var(--muted); font-size: 13px; }

.calendar-controls { display: flex; gap: 8px; }
.calendar-controls button {
  height: 37px;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--ink);
  background: white;
  cursor: pointer;
  font-weight: 750;
}
.calendar-controls button:hover:not(:disabled) { border-color: #acd8d1; color: var(--mint-dark); }
.calendar-controls button:disabled { opacity: 0.4; cursor: default; }
.calendar-arrow { width: 40px; }
.calendar-today { padding: 0 17px; }

.content-warnings {
  margin: -6px 0 20px;
  padding: 13px 16px;
  border: 1px solid #f0cfaa;
  border-radius: 12px;
  color: #80501f;
  background: var(--warning-soft);
  font-size: 12px;
}
.content-warnings ul { display: flex; flex-wrap: wrap; gap: 6px 20px; margin: 6px 0 0; padding-left: 18px; }
.content-warnings a { color: inherit; }

.calendar-body {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--line);
}

.calendar-weekdays,
.calendar-row { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 1px; }

.calendar-weekdays {
  color: #58716e;
  background: #f2f8f7;
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-align: center;
  text-transform: uppercase;
}
.calendar-weekdays span { padding: 12px 5px; background: #f2f8f7; }

.calendar-grid { flex: 1; min-height: 0; display: grid; gap: 1px; }
.calendar-row { min-height: 0; }
.calendar-cell { min-width: 0; min-height: 0; height: auto; background: white; }
.calendar-cell.is-placeholder { background: #f6f9f8; }

.calendar-day {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  color: var(--ink);
  background: white;
  overflow: hidden;
  text-decoration: none;
  transition: box-shadow 140ms ease, background 140ms ease;
}
.calendar-day:hover { z-index: 2; box-shadow: inset 0 0 0 3px var(--mint); }
.calendar-day time {
  position: absolute;
  z-index: 2;
  top: 9px;
  left: 10px;
  display: grid;
  place-items: center;
  min-width: 27px;
  height: 27px;
  padding-inline: 6px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 850;
}
.calendar-day.is-today time { color: white; background: var(--mint-dark); }
.calendar-day.has-proof time { color: white; background: rgba(7, 42, 38, 0.72); backdrop-filter: blur(5px); }
.calendar-day.has-proof.is-today time { background: var(--mint-dark); box-shadow: 0 0 0 2px white; }
.calendar-day img { width: 100%; height: 100%; object-fit: cover; transition: transform 220ms ease; }
.calendar-day.has-proof:hover img { transform: scale(1.035); }

.calendar-day.is-empty { background: #fcfefd; }
.calendar-day.is-empty:hover { background: var(--soft); }
.empty-action,
.missing-action {
  position: absolute;
  right: 11px;
  bottom: 9px;
  display: grid;
  place-items: center;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  color: #89a09d;
  background: #f0f6f5;
  font-size: 18px;
  font-weight: 500;
}
.calendar-day.is-empty:hover .empty-action { color: white; background: var(--mint-dark); }

.calendar-day.is-missing { background: repeating-linear-gradient(-45deg, #fff9f1, #fff9f1 9px, #fff4e5 9px, #fff4e5 18px); }
.calendar-day.is-missing time { color: #87531e; }
.missing-action { color: white; background: var(--warning); font-size: 13px; font-weight: 900; }

.calendar-legend {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 13px 16px;
  color: var(--muted);
  background: #f8fbfa;
  font-size: 11px;
}
.calendar-legend span { display: inline-flex; align-items: center; gap: 7px; }
.calendar-legend i { width: 9px; height: 9px; border-radius: 3px; }
.legend-valid { background: var(--mint-dark); }
.legend-empty { border: 1px solid #afc1be; background: white; }
.legend-warning { background: var(--warning); }
.calendar-noscript { padding: 20px; background: white; }

.empty-state {
  display: grid;
  justify-items: center;
  align-content: center;
  height: 100%;
  padding: 80px;
  text-align: center;
}
.empty-icon { display: grid; place-items: center; width: 70px; height: 70px; margin-bottom: 24px; border-radius: 22px; color: var(--mint-dark); background: var(--soft); font-size: 38px; }
.empty-state h1 { font-size: 46px; }
.empty-state > p:not(.section-kicker) { max-width: 450px; margin: 16px auto 27px; color: var(--muted); line-height: 1.7; }
.primary-button { padding: 14px 20px; border-radius: 12px; color: white; background: var(--mint-dark); text-decoration: none; font-size: 14px; font-weight: 800; box-shadow: 0 10px 25px rgba(11, 118, 110, 0.2); }
.primary-button:hover { background: var(--mint-deep); }

.proof-page { max-width: 900px; min-height: 620px; margin: 0 auto; padding: 36px 48px 60px; border: 1px solid var(--line); border-radius: 28px; background: white; box-shadow: var(--shadow); }
.proof-nav { padding-bottom: 26px; border-bottom: 1px solid var(--line); }
.proof-header { padding: 44px 0 30px; text-align: center; }
.proof-header h1 { font-size: 48px; }
.proof-header time { display: block; margin-top: 11px; color: var(--muted); font-size: 14px; }
.proof-content { color: #304a47; font-size: 17px; line-height: 1.75; }
.proof-content img { display: block; max-width: 100%; max-height: 70vh; margin: 28px auto; border-radius: 18px; box-shadow: 0 16px 45px rgba(22, 67, 63, 0.15); }

.habit-identifier { margin-top: 11px; color: var(--muted); font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 12px; }
.habit-panel { min-width: 0; min-height: 0; display: flex; flex-direction: column; overflow: auto; }
.habit-detail { padding: 28px 39px 24px; }
.habit-detail .proof-nav { padding-bottom: 22px; }
.habit-detail .proof-header { padding: 34px 0 24px; }
.habit-panel .calendar-panel { flex: 0 0 480px; border-top: 1px solid var(--line); }
.habit-content { color: #304a47; font-size: 17px; line-height: 1.75; }
.habit-content img { display: block; max-width: 100%; max-height: 70vh; margin: 28px auto; border-radius: 18px; box-shadow: 0 16px 45px rgba(22, 67, 63, 0.15); }
.habit-proofs { margin-top: 38px; padding-top: 26px; border-top: 1px solid var(--line); }
.habit-proofs h2 { margin: 0 0 16px; font-family: Georgia, "Times New Roman", serif; font-size: 24px; font-weight: 500; letter-spacing: -0.03em; }
.habit-proof-list { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.habit-proof-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: var(--paper);
  text-decoration: none;
  font-weight: 700;
}
.habit-proof-list a:hover { border-color: #acd8d1; color: var(--mint-dark); background: var(--soft); }
.habit-proof-list time { font-weight: 600; }
.habit-proof-list span { color: var(--muted); }
.habit-proofs-empty { margin: 0; color: var(--muted); }

.site-footer { display: flex; align-items: center; justify-content: space-between; padding: 0 2px; color: #81938f; font-size: 11px; }

main { min-height: 0; overflow: auto; }
main:has(.app-shell) { overflow: hidden; }

:focus-visible { outline: 3px solid rgba(47, 200, 179, 0.7); outline-offset: 3px; }

@media (max-width: 1180px) {
  .site-header, .site-footer, main { width: calc(100% - 40px); }
  .app-shell:has(.habit-sidebar) { grid-template-columns: 235px minmax(0, 1fr); }
  .calendar-panel { padding-inline: 28px; }
}