/* SolMemWords — themed on "Nocturne" (the user's own design system, built
   separately in Claude Design): a quiet dark interface, Inter at medium
   weight, one blurple accent used as an outline/line rather than a fill,
   and one separate semantic amber for "needs attention" states. */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  color-scheme: dark;
  --color-bg: #161826;
  --color-surface: #232532;
  --color-text: #e9e9ed;
  --color-accent: #9184d9;
  --color-divider: rgba(233, 233, 237, 0.16);
  --color-warn: #d99a4e;
  --color-error: #e08585;

  --color-neutral-900: #0f1119;
  --color-neutral-800: #3f424d;
  --color-neutral-700: #595d6c;
  --color-neutral-600: #75798c;
  --color-neutral-500: #9397ab;

  --color-accent-100: #f5f4ff;
  --color-accent-200: #e7e5fe;
  --color-accent-300: #d2cefd;
  --color-accent-500: #968ae0;
  --color-accent-600: #796cbf;
  --color-accent-700: #5d5294;
  --color-accent-800: #423a6a;

  --font-heading: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --space-1: 3px; --space-2: 6px; --space-3: 9px; --space-4: 12px; --space-6: 18px; --space-8: 24px;
  --radius-sm: 4px; --radius-md: 8px; --radius-lg: 14px;

  --shadow-sm: 0 0 0 1px var(--color-neutral-800);
  --shadow-md: 0 0 0 1px var(--color-neutral-700), 0 6px 18px rgba(0,0,0,0.55);
  --shadow-lg: 0 0 0 1px var(--color-neutral-500), 0 16px 40px rgba(0,0,0,0.65);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  background: var(--color-bg);
  color: var(--color-text);
}

h1, h2, h3, h4 {
  font-family: var(--font-heading); font-weight: 500; line-height: 1.15;
  letter-spacing: -0.015em; margin: 0 0 var(--space-2); text-wrap: balance;
}
h1 { font-size: 30px; }
h2 { font-size: 22px; }
p { margin: 0 0 var(--space-3); }
a { color: var(--color-accent); text-underline-offset: 3px; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-accent) 30%, transparent); }
.text-muted { color: color-mix(in srgb, var(--color-text) 58%, transparent); }

/* — nav — */
.nav {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-3) var(--space-6); max-width: 720px; margin: 0 auto;
}
.nav-brand { font-family: var(--font-heading); font-weight: 500; font-size: 18px; margin-right: auto; }
.nav a { color: var(--color-text); text-decoration: none; font-size: 16px; opacity: 0.75; }
.nav a:hover { opacity: 1; color: var(--color-accent); }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-6) var(--space-8);
}

.auth-page {
  max-width: 360px;
  margin: 4rem auto;
  padding: var(--space-6);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* — forms — */
form { display: flex; flex-direction: column; gap: var(--space-3); }
form fieldset {
  display: flex; flex-direction: column; gap: var(--space-3);
  border: 1px solid var(--color-divider); border-radius: var(--radius-md); padding: var(--space-3);
}
form legend { font-size: 14px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-accent); padding: 0 4px; }

label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 14px; color: color-mix(in srgb, var(--color-text) 70%, transparent); }
input[type="text"], input[type="password"], textarea {
  width: 100%; min-height: 38px; padding: 7px 10px; font: inherit; font-size: 16px;
  color: var(--color-text); caret-color: var(--color-accent); background: var(--color-bg);
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
}
input[type="text"]:hover, input[type="password"]:hover, textarea:hover {
  border-color: color-mix(in srgb, var(--color-text) 45%, transparent);
}
input[type="text"]:focus-visible, input[type="password"]:focus-visible, textarea:focus-visible {
  border-color: var(--color-accent); outline-offset: 0;
}

/* — buttons — */
button, .button {
  display: inline-flex; align-self: flex-start; align-items: center; justify-content: center; gap: 6px;
  cursor: pointer; text-decoration: none; font-family: var(--font-heading); font-weight: 500;
  font-size: 16px; color: var(--color-accent); background: transparent;
  border: 1px solid var(--color-accent); border-radius: var(--radius-md);
  padding: var(--space-2) calc(var(--space-3) * 1.3);
}
button:hover, .button:hover { background: color-mix(in srgb, var(--color-accent) 12%, transparent); }
button:disabled { opacity: 0.45; cursor: not-allowed; }
button:disabled:hover { background: transparent; }

/* secondary/utility actions (e.g. the hint button) — outlined in the
   divider tone rather than the accent, so it doesn't compete with Submit */
.btn-secondary {
  color: var(--color-text); border-color: var(--color-divider); font-size: 15px; padding-block: 5px;
}
.btn-secondary:hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); }

.error { color: var(--color-error); }
.flash { padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); margin: 0 0 var(--space-3); }
.flash.success { color: var(--color-accent-300); background: color-mix(in srgb, var(--color-accent) 12%, transparent); }
.flash.error { color: var(--color-error); background: color-mix(in srgb, var(--color-error) 12%, transparent); }

/* — cards — */
.card {
  display: flex; flex-direction: column; gap: var(--space-2);
  padding: var(--space-6); border-radius: var(--radius-lg); background: var(--color-surface);
  box-shadow: var(--shadow-md);
}
.card-kicker { font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent); }

/* — tags — */
.tag { display: inline-flex; align-items: center; gap: 5px; font-size: 13px; letter-spacing: 0.02em; padding: 3px 9px; border-radius: 6px; white-space: nowrap; }
.tag-warn { background: color-mix(in srgb, var(--color-warn) 20%, transparent); color: var(--color-warn); }

/* — tables — */
table { width: 100%; border-collapse: collapse; margin-top: var(--space-4); font-size: 16px; }
th, td { text-align: left; padding: var(--space-3) var(--space-2); border-bottom: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent); }
th {
  font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 500;
  color: color-mix(in srgb, var(--color-text) 60%, transparent);
  border-bottom: 1px solid var(--color-divider);
}
tbody tr:hover { background: color-mix(in srgb, var(--color-text) 4%, transparent); }
tr.at-risk td:first-child { box-shadow: inset 3px 0 0 var(--color-warn); }
.streak-flame { color: var(--color-warn); }

/* — exercises — */
.slots {
  font-size: 2rem; letter-spacing: 0.3rem;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}
.prompt-word { font-size: 1.8rem; font-weight: 500; font-family: var(--font-heading); }

.choice-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); margin-bottom: var(--space-3); }
.option {
  display: flex; align-items: center; justify-content: center; text-align: center;
  min-height: 84px; padding: var(--space-3); cursor: pointer;
  border: 1px solid var(--color-divider); border-radius: var(--radius-lg); font-size: 18px;
}
.option:hover { border-color: color-mix(in srgb, var(--color-text) 45%, transparent); }
.option:has(input:checked) {
  border-color: var(--color-accent); color: var(--color-accent-300);
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
}
.option input { position: absolute; opacity: 0; width: 0; height: 0; }

/* — progress bar (position within a session) — */
.progress-bar { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) var(--space-6); max-width: 720px; margin: 0 auto; }
.progress-bar .track { flex: 1; height: 8px; border-radius: 99px; background: var(--color-neutral-800); overflow: hidden; }
.progress-bar .fill { height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--color-accent-800), var(--color-accent)); }
.progress-bar .frac { font-size: 15px; color: color-mix(in srgb, var(--color-text) 55%, transparent); white-space: nowrap; }

/* — the sun: a small pulsing mascot standing in for daily-goal progress — */
@keyframes sun-pulse { 0%, 100% { box-shadow: 0 0 22px color-mix(in srgb, var(--color-accent) 45%, transparent); } 50% { box-shadow: 0 0 40px color-mix(in srgb, var(--color-accent) 75%, transparent); } }
.sun {
  border-radius: 50%; flex: none;
  background: radial-gradient(circle at 34% 32%, var(--color-accent-200), var(--color-accent-500) 70%);
  animation: sun-pulse 4.5s ease-in-out infinite;
}
/* The small nav-bar sun stays still — a fixed glow, not a pulse — so it
   doesn't animate constantly in a persistent header. */
.sun-sm { width: 20px; height: 20px; animation: none; box-shadow: 0 0 14px color-mix(in srgb, var(--color-accent) 55%, transparent); }
.sun-md { width: 56px; height: 56px; }
.sun-lg { width: 96px; height: 96px; }

.goal-ring { position: relative; width: 168px; height: 168px; margin: 0 auto; }
.goal-ring svg { width: 100%; height: 100%; }
.goal-ring-center {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: var(--space-2);
}

/* — week strip (7-day bar chart) — */
.week-strip { display: flex; gap: 7px; }
.week-strip .bar {
  flex: 1; height: 44px; border-radius: var(--radius-sm); background: var(--color-neutral-800);
  display: flex; align-items: flex-end; justify-content: center; padding-bottom: 5px;
  font-size: 13px; color: color-mix(in srgb, var(--color-text) 45%, transparent);
}
.week-strip .bar.today { box-shadow: inset 0 0 0 1px var(--color-accent); color: var(--color-accent); }

/* — letter-tile builder (Method 1) — */
.slot-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: var(--space-3); }
.slot-row .slot {
  width: 34px; height: 52px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font: 500 22px ui-monospace, "SF Mono", Menlo, monospace;
  box-shadow: inset 0 0 0 1px var(--color-neutral-800); background: var(--color-neutral-900);
}
.slot-row .slot.filled { background: var(--color-surface); box-shadow: inset 0 -2px 0 var(--color-accent); cursor: pointer; }
.slot-row .slot.hinted { background: var(--color-accent-800); color: var(--color-accent-100); box-shadow: none; }
.tile-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(42px, 1fr)); gap: 8px; margin-bottom: var(--space-3); }
.tile-row button {
  align-self: stretch; height: 52px; font-size: 20px; font-family: ui-monospace, "SF Mono", Menlo, monospace;
}
.tile-row button:disabled { visibility: hidden; }

/* — segmented control — */
.seg { display: flex; border: 1px solid var(--color-divider); border-radius: var(--radius-md); overflow: hidden; }
.seg a {
  flex: 1; text-align: center; padding: var(--space-2) var(--space-3); font-size: 15px;
  color: var(--color-text); text-decoration: none; opacity: 0.7;
}
.seg a + a { border-left: 1px solid var(--color-divider); }
.seg a.is-active { color: var(--color-accent); background: color-mix(in srgb, var(--color-accent) 10%, transparent); opacity: 1; }

/* — stat tiles — */
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); margin: var(--space-3) 0; }
.stat-tile { padding: 15px; border-radius: var(--radius-md); background: var(--color-surface); }
.stat-tile .n { font-size: 32px; font-weight: 600; line-height: 1; font-family: var(--font-heading); font-variant-numeric: tabular-nums; }
.stat-tile .label { font-size: 14px; color: color-mix(in srgb, var(--color-text) 55%, transparent); margin-top: 4px; }
.stat-tile.accent { box-shadow: inset 0 0 0 1px var(--color-accent); }
.stat-tile.accent .n, .stat-tile.accent .label { color: var(--color-accent-300); }

/* — roster cards (tutor dashboard) — */
.roster-card { padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); background: var(--color-surface); margin-bottom: var(--space-2); }
.roster-card.quiet { box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-warn) 45%, transparent); }
.roster-card .row { display: flex; align-items: baseline; gap: var(--space-2); }
.roster-card .name { font-size: 17px; }
.roster-card .meta { font-size: 15px; color: color-mix(in srgb, var(--color-text) 55%, transparent); margin-top: 4px; }
.roster-section-label { font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: color-mix(in srgb, var(--color-text) 45%, transparent); margin: var(--space-4) 0 var(--space-2); }

/* — activity heatmap — */
/* A real grid of near-square cells, not a wrapped strip of tiny dots —
   auto-fill keeps cells a readable size regardless of container width. */
.heatmap { display: grid; grid-template-columns: repeat(auto-fill, minmax(16px, 1fr)); gap: 5px; }
.heatmap .day { aspect-ratio: 1; border-radius: 4px; background: var(--color-neutral-800); }
.heatmap-legend { display: flex; align-items: center; gap: 6px; font-size: 13px; color: color-mix(in srgb, var(--color-text) 45%, transparent); margin-top: var(--space-2); }
.heatmap-legend .day { width: 14px; height: 14px; aspect-ratio: unset; border-radius: 4px; }