/* LevelUp design system. One file, no build step. */

:root {
  /* Ground */
  --ink-900: #0a0a1f;
  --ink-800: #12123a;
  --ink-700: #1c1c4d;
  --ink-600: #2a2a63;
  --surface: #ffffff;
  --surface-muted: #f2f4fb;

  /* Brand */
  --green: #39ff6a;
  --green-dark: #17c246;
  --cyan: #22d3ee;
  --magenta: #ff3ca5;
  --violet: #8b5cf6;
  --gold: #ffc531;

  /* Text */
  --text-on-dark: #ffffff;
  --text-on-dark-muted: #b9bde0;
  --text-on-light: #14142b;
  --text-on-light-muted: #56597a;

  /* Feedback */
  --danger: #ff4d5e;
  --warning: #ffb020;

  /* Shape */
  --radius: 14px;
  --radius-lg: 22px;
  --gap: 16px;
  --tap-target: 44px;
  --shadow-card: 0 6px 24px rgba(4, 4, 30, 0.35);
  --glow-green: 0 0 18px rgba(57, 255, 106, 0.55);

  --font-display: "Archivo Black", "Arial Black", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 20% -10%, var(--ink-700), var(--ink-900) 60%);
  background-attachment: fixed;
  color: var(--text-on-dark);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

/* Layout ------------------------------------------------------------- */

.shell {
  max-width: 560px;
  margin: 0 auto;
  padding: var(--gap) var(--gap) 96px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: 12px 0;
}

.brand {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: -0.5px;
  text-transform: uppercase;
}
.brand .up {
  color: var(--green);
  text-shadow: var(--glow-green);
}
.brand-tagline {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--cyan);
}

/* XP bar ------------------------------------------------------------- */

.xp-block { margin: 8px 0 20px; }
.xp-bar {
  height: 18px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  overflow: hidden;
}
.xp-bar__fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--green-dark), var(--green));
  box-shadow: var(--glow-green);
  transition: width 900ms cubic-bezier(0.22, 1, 0.36, 1);
}
.xp-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-on-dark-muted);
  margin-top: 6px;
}
.level-pill {
  font-family: var(--font-display);
  background: var(--gold);
  color: var(--text-on-light);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 13px;
}

/* Tabs --------------------------------------------------------------- */

.tabs { display: flex; gap: 10px; margin: 18px 0; }
.tab {
  flex: 1;
  min-height: var(--tap-target);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  border: none;
  border-radius: var(--radius);
  padding: 10px 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-on-dark);
  background: var(--ink-600);
  cursor: pointer;
}
.tab[aria-selected="true"] { outline: 2px solid var(--green); }
.tab--school { background: #1d4ed8; }
.tab--teacher { background: var(--violet); }
.tab--mine { background: var(--magenta); }

/* Cards -------------------------------------------------------------- */

.panel {
  background: var(--surface);
  color: var(--text-on-light);
  border-radius: var(--radius-lg);
  padding: var(--gap);
  box-shadow: var(--shadow-card);
}

.goal-card {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--surface-muted);
}
.goal-card:last-child { border-bottom: none; }
.goal-card__title { font-weight: 600; font-size: 15px; }
.goal-card__xp {
  font-weight: 700;
  color: var(--green-dark);
  white-space: nowrap;
}
.progress {
  height: 8px;
  background: var(--surface-muted);
  border-radius: 999px;
  margin-top: 6px;
  overflow: hidden;
}
.progress__fill {
  height: 100%;
  background: linear-gradient(90deg, #2563eb, var(--cyan));
  border-radius: 999px;
  transition: width 700ms ease-out;
}
.progress__fill--done { background: linear-gradient(90deg, var(--green-dark), var(--green)); }

/* Buttons and forms -------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--tap-target);
  padding: 12px 20px;
  border: none;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  text-decoration: none;
  cursor: pointer;
}
.btn--primary {
  background: var(--green);
  color: #062b12;
  box-shadow: var(--glow-green);
}
.btn--ghost {
  background: transparent;
  color: var(--text-on-dark);
  border: 2px solid rgba(255, 255, 255, 0.35);
}
.btn--block { width: 100%; }
.btn:focus-visible { outline: 3px solid var(--cyan); outline-offset: 2px; }

.field { margin-bottom: var(--gap); }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-on-dark-muted);
}
.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: var(--tap-target);
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 2px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-on-dark);
  font-size: 16px; /* 16px stops iOS zooming the page on focus */
}
.field input:focus { outline: none; border-color: var(--green); }
.field--code input {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 10px;
  text-align: center;
}

.notice {
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: var(--gap);
  font-size: 14px;
}
.notice--error { background: rgba(255, 77, 94, 0.15); border: 1px solid var(--danger); }
.notice--ok { background: rgba(57, 255, 106, 0.12); border: 1px solid var(--green); }

/* Celebration -------------------------------------------------------- */

@keyframes level-pop {
  0% { transform: scale(0.6); opacity: 0; }
  60% { transform: scale(1.12); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}
.celebrate { animation: level-pop 600ms cubic-bezier(0.22, 1, 0.36, 1); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* Accessibility ------------------------------------------------------ */

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
a { color: var(--cyan); }