:root {
  --bg: #0a0b10;
  --bg-2: #12131b;
  --bg-3: #0f1119;
  --fg: #f1f5f9;
  --muted: #94a3b8;
  --dim: #64748b;
  --line: #1e2130;
  --accent: #7c3aed;
  --accent-2: #06b6d4;
  --warn: #f59e0b;
  --ok: #22c55e;
  --danger: #ef4444;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: radial-gradient(ellipse at top, #151724 0%, var(--bg) 60%);
  background-attachment: fixed;
  color: var(--fg);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

body {
  padding: 1rem 1rem 6rem;
  max-width: 500px;
  margin: 0 auto;
  font-size: 16px;
}

/* ===== HEADER ===== */
header { padding: 0.5rem 0 1.25rem; }

.eyebrow {
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  margin-bottom: 0.85rem;
}
.eyebrow .dot {
  width: 7px; height: 7px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--warn));
  box-shadow: 0 0 10px rgba(124, 58, 237, 0.55);
}

.day-nav {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.day-nav button {
  width: 2.5rem; height: 2.5rem;
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 10px;
  font-size: 1.1rem;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}
.day-nav button:not(:disabled):active { border-color: var(--accent); }
.day-nav button:disabled { color: var(--dim); opacity: 0.35; cursor: default; }

.date-stack { text-align: center; flex: 1; }
.date-stack h1 {
  font-size: clamp(1.1rem, 4.8vw, 1.35rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, #f1f5f9 0%, #c4b5fd 55%, #fbbf24 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.date-stack .today-tag {
  display: inline-block;
  margin-top: 0.3rem;
  font-size: 9.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.2em;
  color: var(--accent-2);
  text-transform: uppercase;
}

/* ===== EXERCISE CARDS ===== */
.ex {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.95rem 1rem;
  margin-bottom: 0.6rem;
  transition: border-color 0.25s;
}
.ex.done { border-color: rgba(245, 158, 11, 0.45); }
.ex.has-pending { border-color: rgba(124, 58, 237, 0.4); }
.ex.has-pending.done { border-color: rgba(245, 158, 11, 0.55); }

.ex-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.65rem;
}
.ex-title { font-size: 1rem; font-weight: 600; color: var(--fg); }
.ex-spec {
  font-size: 0.72rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--muted);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.progress-bar {
  position: relative;
  height: 9px;
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.7rem;
}
.progress-bar::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg,
    #7c3aed 0%,
    #a855f7 25%,
    #d946ef 50%,
    #f472b6 72%,
    #f59e0b 100%);
}
.progress-bar::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0; right: 0;
  left: var(--pct, 0%);
  background: var(--bg-3);
  transition: left 0.3s ease;
}

.ex-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.ex-count {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  color: var(--muted);
}
.ex.done .ex-count { color: var(--warn); }
.pending-dot {
  display: inline-block;
  width: 5px; height: 5px;
  margin-left: 0.45rem;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 6px rgba(124, 58, 237, 0.7);
  vertical-align: middle;
}

button.tap {
  background: var(--bg-3);
  border: 1px solid var(--line);
  color: var(--fg);
  padding: 0.55rem 1.05rem;
  border-radius: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92rem;
  font-weight: 600;
  min-width: 4.25rem;
  cursor: pointer;
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}
button.tap:active { transform: scale(0.95); border-color: var(--accent); }
.ex.done button.tap { border-color: rgba(245, 158, 11, 0.4); color: var(--warn); }
.ex.has-pending button.tap { border-color: rgba(124, 58, 237, 0.45); }
button.tap:disabled { opacity: 0.35; cursor: default; }
button.tap:disabled:active { transform: none; }

/* ===== SYNC BAR ===== */
#sync-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: rgba(10, 11, 16, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  padding: 0.75rem 1rem;
  padding-bottom: max(0.75rem, env(safe-area-inset-bottom));
  display: flex;
  gap: 0.55rem;
  max-width: 500px;
  margin: 0 auto;
  z-index: 10;
}
#sync-btn {
  flex: 1;
  background: linear-gradient(135deg, var(--accent), var(--warn));
  color: #0a0b10;
  border: none;
  padding: 0.8rem;
  border-radius: 10px;
  font-size: 0.93rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: filter 0.2s, opacity 0.2s;
  -webkit-tap-highlight-color: transparent;
}
#sync-btn.clean {
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--muted);
  font-weight: 500;
}
#sync-btn.syncing { opacity: 0.6; }
#sync-btn:active { filter: brightness(0.92); }
#settings-btn {
  width: 3rem;
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 10px;
  font-size: 1.05rem;
  cursor: pointer;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

/* ===== SETTINGS ===== */
#settings {
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at top, #151724 0%, var(--bg) 60%);
  padding: 2rem 1.5rem;
  z-index: 100;
  max-width: 500px;
  margin: 0 auto;
  overflow-y: auto;
}
#settings h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #f1f5f9, #c4b5fd);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
#settings h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.55rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
#settings label {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 0.35rem;
  margin-top: 0.9rem;
  letter-spacing: 0.03em;
}
#settings input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  background: var(--bg-3);
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 8px;
  font-size: 0.88rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
#settings input:focus { outline: none; border-color: var(--accent); }
#settings .row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.9rem; }
#settings button {
  padding: 0.55rem 1rem;
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.2s;
}
#settings button:active { border-color: var(--accent); }
#settings button.primary {
  background: linear-gradient(135deg, var(--accent), var(--warn));
  border: none;
  color: #0a0b10;
  font-weight: 700;
}
#settings button.danger {
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}
#settings button.danger:active { border-color: var(--danger); }
#settings .help {
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.55;
}
#settings .help a { color: var(--accent-2); }
#settings .help code {
  background: var(--bg-3);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
#settings pre {
  background: #06070c;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 0.71rem;
  color: var(--muted);
  overflow-x: auto;
  max-height: 200px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ===== UTIL STATES ===== */
.loading, .error, .empty {
  padding: 3rem 1rem;
  text-align: center;
  line-height: 1.55;
}
.loading { color: var(--muted); }
.error { color: #fca5a5; }
.empty { color: var(--muted); }
.error button, .empty button {
  margin-top: 1rem;
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--fg);
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  font-size: 0.88rem;
  cursor: pointer;
  font-family: inherit;
}
.error button:active, .empty button:active { border-color: var(--accent); }

.toast {
  position: fixed;
  bottom: 5.25rem; left: 50%;
  transform: translateX(-50%);
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--fg);
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  z-index: 200;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.55);
  animation: toast 2.2s ease-out forwards;
}
.toast.error { border-color: rgba(239, 68, 68, 0.4); color: #fca5a5; }
.toast.accent { border-color: rgba(124, 58, 237, 0.5); }
@keyframes toast {
  0% { opacity: 0; transform: translate(-50%, 10px); }
  15%, 85% { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, -10px); }
}