:root {
  /* Calm stone — nearly achromatic, mature */
  --bg: #0f0f0f;
  --bg-soft: #171717;
  --line: rgba(232, 228, 220, 0.12);
  --text: #ebe7e0;
  --muted: rgba(235, 231, 224, 0.52);
  --accent: #c4beb3;
  --accent-soft: #f2efe8;
  --accent-glow: rgba(196, 190, 179, 0.26);
  --accent-dim: rgba(196, 190, 179, 0.16);
  --accent-ink: #141414;
  --ok-track: rgba(232, 228, 220, 0.08);
  --danger: #b88989;
  --radius: 18px;
  --font-display: "Syne", sans-serif;
  --font-body: "Zen Kaku Gothic New", sans-serif;
  --dock-h: 72px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

body {
  min-height: 100dvh;
  overflow-x: hidden;
}

button,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: 0;
  background: none;
}

.atmosphere {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(900px 480px at 80% -10%, rgba(183, 177, 166, 0.12), transparent 60%),
    radial-gradient(700px 420px at 10% 100%, rgba(183, 177, 166, 0.06), transparent 55%),
    linear-gradient(180deg, #161616 0%, var(--bg) 42%, #0a0a0a 100%);
  z-index: 0;
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.app {
  position: relative;
  z-index: 1;
  width: min(720px, 100%);
  margin: 0 auto;
  min-height: 100dvh;
  padding: 28px 20px calc(var(--dock-h) + 28px);
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 34px;
  animation: rise 700ms ease both;
}

.brand-mark {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 9vw, 3.6rem);
  letter-spacing: 0.04em;
  line-height: 0.95;
  background: linear-gradient(120deg, var(--accent-soft) 10%, var(--accent) 70%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.date-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: right;
  white-space: nowrap;
}

.panel-head {
  margin-bottom: 22px;
}

.panel-head h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.panel-sub {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.hidden {
  display: none !important;
}

.habit-list,
.manage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.habit-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent);
  overflow: hidden;
  transition:
    border-color 220ms ease,
    transform 220ms ease,
    box-shadow 220ms ease;
  animation: rise 650ms ease both;
}

.habit-item:nth-child(1) { animation-delay: 40ms; }
.habit-item:nth-child(2) { animation-delay: 90ms; }
.habit-item:nth-child(3) { animation-delay: 140ms; }
.habit-item:nth-child(4) { animation-delay: 190ms; }
.habit-item:nth-child(5) { animation-delay: 240ms; }

.habit-item::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: transparent;
  transition: background 220ms ease, box-shadow 220ms ease;
}

.habit-item.done {
  border-color: color-mix(in srgb, var(--habit, var(--accent)) 55%, transparent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--habit, var(--accent)) 12%, transparent),
    0 10px 40px -24px color-mix(in srgb, var(--habit, var(--accent)) 35%, transparent);
}

.habit-item.done::before {
  background: var(--habit, var(--accent));
  box-shadow: 0 0 18px color-mix(in srgb, var(--habit, var(--accent)) 40%, transparent);
}

.habit-item.pop {
  animation: pop 360ms cubic-bezier(0.2, 0.9, 0.2, 1);
}

.habit-copy {
  min-width: 0;
}

.habit-name {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.habit-state {
  margin: 6px 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.habit-item.done .habit-state {
  color: color-mix(in srgb, var(--habit, var(--accent-soft)) 70%, white);
}

.check-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--ok-track);
  display: grid;
  place-items: center;
  transition:
    background 220ms ease,
    border-color 220ms ease,
    box-shadow 220ms ease,
    transform 160ms ease;
}

.check-btn svg {
  width: 22px;
  height: 22px;
  opacity: 0.35;
  transform: scale(0.85);
  transition: opacity 180ms ease, transform 180ms ease;
}

.habit-item.done .check-btn {
  background: var(--habit, var(--accent));
  border-color: transparent;
  box-shadow: 0 0 28px color-mix(in srgb, var(--habit, var(--accent)) 40%, transparent);
}

.habit-item.done .check-btn svg {
  opacity: 1;
  transform: scale(1);
  color: var(--accent-ink);
}

.check-btn:active {
  transform: scale(0.94);
}

.stack-meta {
  display: flex;
  gap: 28px;
  margin-bottom: 18px;
}

.stack-meta .meta-label {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.stack-meta strong {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--accent-soft);
}

.stack-board {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(14px, 1fr);
  gap: 5px;
  align-items: end;
  min-height: 220px;
  padding: 18px 8px 10px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-dim) transparent;
}

.day-col {
  display: grid;
  gap: 3px;
  min-height: 180px;
  align-content: end;
  padding: 0;
  border-radius: 10px;
  transition: background 160ms ease;
}

.day-col:hover,
.day-col:focus-visible {
  background: rgba(255, 255, 255, 0.03);
  outline: none;
}

.day-col .layer {
  height: 14px;
  border-radius: 999px;
  background: rgba(232, 228, 220, 0.06);
  transition: background 220ms ease, box-shadow 220ms ease, transform 220ms ease;
}

.day-col .layer.on {
  background: var(--habit, var(--accent));
  box-shadow: 0 0 12px color-mix(in srgb, var(--habit, var(--accent)) 35%, transparent);
}

.day-col.complete .layer.on {
  box-shadow: 0 0 16px color-mix(in srgb, var(--habit, var(--accent)) 45%, transparent);
}

.day-col.today .layer:not(.on) {
  background: rgba(196, 190, 179, 0.12);
}

.day-label {
  margin-top: 8px;
  text-align: center;
  font-size: 0.65rem;
  color: var(--muted);
  font-family: var(--font-display);
}

.day-col.today .day-label {
  color: var(--accent);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 16px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.82rem;
}

.legend-swatch {
  width: 18px;
  height: 6px;
  border-radius: 999px;
  background: var(--habit, var(--accent));
  opacity: 0.9;
}

.habit-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  margin-bottom: 18px;
}

.habit-form .color-field {
  grid-column: 1 / -1;
}

.habit-form input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.habit-form input:focus {
  border-color: rgba(183, 177, 166, 0.55);
  box-shadow: 0 0 0 3px rgba(183, 177, 166, 0.12);
}

.btn-accent {
  padding: 0 18px;
  border-radius: 14px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: 0 8px 30px -12px var(--accent-glow);
  transition: transform 160ms ease, filter 160ms ease;
}

.btn-accent:hover {
  filter: brightness(1.05);
}

.btn-accent:active {
  transform: scale(0.97);
}

.manage-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 12px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
}

.manage-main {
  min-width: 0;
  display: grid;
  gap: 10px;
}

.manage-item p {
  margin: 0;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
}

.manage-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--habit, var(--accent));
  box-shadow: 0 0 10px color-mix(in srgb, var(--habit, var(--accent)) 45%, transparent);
  flex: 0 0 auto;
}

.color-field {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.color-field.compact {
  gap: 7px;
}

.color-swatch {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--swatch);
  border: 2px solid transparent;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.25);
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

.color-field.compact .color-swatch {
  width: 22px;
  height: 22px;
}

.color-swatch:hover {
  transform: scale(1.06);
}

.color-swatch.selected {
  border-color: var(--accent-soft);
  box-shadow:
    0 0 0 2px rgba(15, 15, 15, 0.9),
    0 0 0 3px color-mix(in srgb, var(--swatch) 70%, white);
}

.danger-btn {
  color: var(--danger);
  font-size: 0.85rem;
  padding: 8px 10px;
  border-radius: 10px;
  transition: background 160ms ease;
}

.danger-btn:hover {
  background: rgba(184, 137, 137, 0.12);
}

.sheet {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  align-items: end;
}

.sheet.hidden {
  display: none !important;
}

.sheet-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
}

.sheet-panel {
  position: relative;
  width: min(720px, 100%);
  margin: 0 auto;
  max-height: min(78dvh, 640px);
  overflow: auto;
  padding: 22px 20px calc(20px + env(safe-area-inset-bottom));
  border-radius: 24px 24px 0 0;
  background: linear-gradient(180deg, #1a1a1a 0%, #121212 100%);
  border: 1px solid var(--line);
  border-bottom: 0;
  box-shadow: 0 -20px 60px rgba(0, 0, 0, 0.45);
  animation: sheet-up 220ms ease;
}

.sheet-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.sheet-head h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.sheet-x {
  color: var(--muted);
  font-size: 0.88rem;
  padding: 8px 10px;
  border-radius: 10px;
}

.sheet-x:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

body.sheet-open {
  overflow: hidden;
}

@keyframes sheet-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.dock {
  position: fixed;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  width: min(420px, calc(100% - 24px));
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  padding: 8px;
  border-radius: 999px;
  background: rgba(12, 12, 18, 0.78);
  border: 1px solid rgba(255, 230, 242, 0.12);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 5;
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.35);
}

.dock-btn {
  padding: 12px 8px;
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  transition: color 180ms ease, background 180ms ease;
}

.dock-btn.active {
  color: var(--accent-ink);
  background: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
}

.empty {
  padding: 28px 8px;
  color: var(--muted);
  text-align: center;
  line-height: 1.7;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pop {
  0% { transform: scale(1); }
  40% { transform: scale(1.015); }
  100% { transform: scale(1); }
}

@media (max-width: 480px) {
  .app {
    padding-top: 22px;
  }

  .top {
    align-items: flex-start;
    flex-direction: column;
  }

  .date-label {
    text-align: left;
  }

  .check-btn {
    width: 48px;
    height: 48px;
  }
}