:root {
  --bg: #f3f7ff;
  --ink: #22314e;
  --purple: #7c5cff;
  --pink: #ff5fa2;
  --blue: #35a7ff;
  --green: #34c759;
  --yellow: #ffcc33;
  --orange: #ff9f45;
  --red: #ff4d5e;
  --card: #ffffff;
  --shadow: 0 8px 24px rgba(60, 70, 120, .14);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Baloo 2", "Comic Sans MS", "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: linear-gradient(160deg, #eef3ff 0%, #fdf0f8 100%);
  min-height: 100vh;
}

button { font-family: inherit; cursor: pointer; }

/* ---------- Top bar ---------- */
#topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 16px;
  padding: 10px 18px;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 12px rgba(60,70,120,.1);
}
#topbar .brand {
  font-size: 22px; font-weight: 800; color: var(--purple);
  cursor: pointer; white-space: nowrap;
}
#topbar .brand span { color: var(--pink); }

.timer-wrap { margin-left: auto; display: flex; align-items: center; gap: 10px; position: relative; }
#timer-display {
  font-size: 26px; font-weight: 800; letter-spacing: 1px;
  padding: 4px 14px; border-radius: 14px;
  background: #eef1ff; color: var(--ink); min-width: 96px; text-align: center;
}
#timer-display.warn { background: #fff2cc; color: #a6791a; }
#timer-display.ringing { background: var(--red); color: #fff; animation: ring 0.5s ease-in-out infinite; }
@keyframes ring { 0%,100% { transform: rotate(-4deg);} 50% { transform: rotate(4deg);} }

.clock-btn {
  font-size: 24px; border: none; background: #eef1ff;
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center; transition: transform .15s;
}
.clock-btn:hover { transform: scale(1.1) rotate(10deg); background: #e2e7ff; }

.clock-menu {
  position: absolute; top: 54px; right: 0;
  background: #fff; border-radius: 16px; box-shadow: var(--shadow);
  padding: 10px; display: none; flex-direction: column; gap: 6px; width: 190px;
}
.clock-menu.open { display: flex; }
.clock-menu h4 { margin: 4px 6px; font-size: 14px; color: #7a8299; }
.clock-menu button {
  border: none; background: #f2f4ff; color: var(--ink);
  padding: 10px; border-radius: 10px; font-size: 15px; font-weight: 700; text-align: left;
}
.clock-menu button:hover { background: var(--purple); color: #fff; }

/* ---------- Layout ---------- */
main { max-width: 1080px; margin: 0 auto; padding: 22px 18px 60px; }

h1.page-title { font-size: 30px; margin: 8px 0 4px; }
p.subtitle { margin: 0 0 22px; color: #6b73a0; }

.back-btn {
  border: none; background: #fff; box-shadow: var(--shadow);
  padding: 9px 16px; border-radius: 999px; font-weight: 700; color: var(--purple);
  margin-bottom: 18px; font-size: 15px;
}
.back-btn:hover { background: var(--purple); color: #fff; }

/* ---------- Home cards ---------- */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 20px;
}
.activity-card {
  background: var(--card); border-radius: 22px; padding: 24px; box-shadow: var(--shadow);
  border: none; text-align: left; transition: transform .15s, box-shadow .15s;
  display: flex; flex-direction: column; gap: 8px; color: var(--ink);
}
.activity-card:hover { transform: translateY(-6px); box-shadow: 0 16px 32px rgba(60,70,120,.2); }
.activity-card .emoji { font-size: 46px; }
.activity-card h3 { margin: 4px 0 0; font-size: 22px; }
.activity-card p { margin: 0; color: #6b73a0; font-size: 14px; }
.activity-card .tag { align-self: flex-start; margin-top: 6px; font-size: 12px; font-weight: 700;
  padding: 3px 10px; border-radius: 999px; background: #eef1ff; color: var(--purple); }

.c1 { border-top: 6px solid var(--purple); }
.c2 { border-top: 6px solid var(--pink); }
.c3 { border-top: 6px solid var(--blue); }
.c4 { border-top: 6px solid var(--green); }
.c5 { border-top: 6px solid var(--orange); }
.c6 { border-top: 6px solid var(--yellow); }
.c7 { border-top: 6px solid #17c3b2; }

/* ---------- Study-group picker ---------- */
.group-picker {
  background: var(--card); border-radius: 22px; box-shadow: var(--shadow);
  padding: 18px 20px; margin: 0 0 26px; border-top: 6px solid var(--purple);
}
.group-head h2 { margin: 0 0 2px; font-size: 22px; color: var(--purple); }
.group-head p { margin: 0 0 14px; color: #6b73a0; font-size: 14px; }
.group-chips {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px;
}
.group-chip {
  display: flex; align-items: center; gap: 10px; text-align: left;
  background: #f2f4ff; border: 2px solid transparent; border-radius: 16px;
  padding: 10px 12px; color: var(--ink); transition: transform .1s, border-color .15s, background .15s;
}
.group-chip:hover { transform: translateY(-2px); }
.group-chip.on { background: #eafaef; border-color: var(--green); }
.group-chip .gc-check {
  flex: 0 0 24px; width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 900; color: #fff;
  background: #c9cfe6;
}
.group-chip.on .gc-check { background: var(--green); }
.group-chip .gc-emoji { font-size: 24px; }
.group-chip .gc-body { display: flex; flex-direction: column; min-width: 0; }
.group-chip .gc-name { font-weight: 800; font-size: 15px; }
.group-chip .gc-states {
  font-size: 12px; color: #6b73a0; line-height: 1.2;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.group-count { margin-top: 12px; font-size: 15px; color: var(--ink); }
.group-count b { color: var(--purple); }

/* ---------- Generic panels ---------- */
.panel { background: #fff; border-radius: 22px; box-shadow: var(--shadow); padding: 24px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.pill-btn {
  border: none; border-radius: 999px; padding: 12px 22px; font-size: 16px; font-weight: 800; color: #fff;
  background: var(--purple); box-shadow: var(--shadow); transition: transform .1s;
}
.pill-btn:hover { transform: translateY(-2px); }
.pill-btn.pink { background: var(--pink); }
.pill-btn.blue { background: var(--blue); }
.pill-btn.green { background: var(--green); }
.pill-btn.gray { background: #8890b3; }
.pill-btn.ghost { background: #eef1ff; color: var(--purple); box-shadow: none; }

.text-input {
  font-family: inherit; font-size: 20px; padding: 12px 16px; border-radius: 14px;
  border: 3px solid #e2e7ff; outline: none; width: 100%; max-width: 340px;
}
.text-input:focus { border-color: var(--purple); }

.scorebar { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 16px; font-weight: 700; }
.scorebar .chip { background: #fff; box-shadow: var(--shadow); border-radius: 999px; padding: 8px 16px; font-size: 15px; }

/* ---------- Flashcards ---------- */
.flash-stage { display: grid; place-items: center; gap: 18px; }
.flashcard {
  width: min(460px, 90vw); height: 280px; perspective: 1200px; cursor: pointer;
}
.flashcard-inner {
  position: relative; width: 100%; height: 100%; transition: transform .5s; transform-style: preserve-3d;
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flash-face {
  position: absolute; inset: 0; backface-visibility: hidden; border-radius: 24px;
  display: grid; place-items: center; text-align: center; padding: 20px; box-shadow: var(--shadow);
}
.flash-front { background: linear-gradient(150deg, var(--purple), var(--blue)); color: #fff; }
.flash-back { background: linear-gradient(150deg, var(--pink), var(--orange)); color: #fff; transform: rotateY(180deg); }
.flash-face .label { font-size: 14px; text-transform: uppercase; letter-spacing: 2px; opacity: .9; }
.flash-face .big { font-size: 40px; font-weight: 800; margin-top: 8px; }
.flash-face .hint { margin-top: 14px; font-size: 14px; opacity: .85; }

/* ---------- Feedback ---------- */
.feedback { margin-top: 16px; font-size: 18px; font-weight: 700; min-height: 28px; }
.feedback.correct { color: var(--green); }
.feedback.close { color: #d9930a; }
.feedback.wrong { color: var(--red); }
.spellout { font-size: 22px; letter-spacing: 3px; background: #fff7db; padding: 4px 10px; border-radius: 8px; }

/* ---------- Map ---------- */
.map-holder { background: #fff; border-radius: 22px; box-shadow: var(--shadow); padding: 12px; }
.map-holder svg { width: 100%; height: auto; display: block; }
.map-holder svg path { stroke: #fff; stroke-width: 1; transition: fill .15s; }
.map-holder svg path.pickable { cursor: pointer; fill: #cfd8f5; }
.map-holder svg path.pickable:hover { fill: var(--blue); }
.map-holder svg path.target { fill: var(--yellow) !important; }
.map-holder svg path.choice { fill: #fff3b0; cursor: pointer; }
.map-holder svg path.choice:hover { fill: var(--yellow); }
.map-holder svg path.correct { fill: var(--green) !important; }
.map-holder svg path.wrong { fill: var(--red) !important; }
.map-holder svg path.dim { fill: #e6e9f2; pointer-events: none; }
@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-4px)} 75%{transform:translateX(4px)} }
.map-holder svg path.shake { animation: shake .3s; }

/* ---------- Song ---------- */
.song-layout { display: grid; grid-template-columns: 1.4fr 1fr; gap: 20px; align-items: start; }
.video-frame { position: relative; padding-top: 56.25%; border-radius: 18px; overflow: hidden; box-shadow: var(--shadow); }
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.lyrics { background: #fff; border-radius: 18px; box-shadow: var(--shadow); padding: 18px; max-height: 520px; overflow: auto; }
.lyrics h3 { margin: 6px 0; color: var(--purple); position: sticky; top: 0; background: #fff; }
.lyrics .lyr-region { font-weight: 800; color: var(--pink); margin-top: 12px; }
.lyrics ul { margin: 4px 0; padding-left: 18px; }
.lyrics li { margin: 2px 0; }
.song-picker { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.song-picker button { border: none; background: #eef1ff; color: var(--ink); padding: 8px 14px; border-radius: 999px; font-weight: 700; }
.song-picker button.active { background: var(--purple); color: #fff; }
@media (max-width: 820px) { .song-layout { grid-template-columns: 1fr; } }

/* ---------- Final test ---------- */
.test-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 24px; }
@media (max-width: 720px) { .test-grid { grid-template-columns: 1fr; } }
.test-row { display: flex; align-items: center; gap: 10px; padding: 6px; border-radius: 10px; }
.test-row .num { width: 26px; color: #9aa2c4; font-weight: 700; text-align: right; }
.test-row .st { width: 130px; font-weight: 700; }
.test-row input { flex: 1; font-family: inherit; font-size: 16px; padding: 8px 10px; border-radius: 10px; border: 2px solid #e2e7ff; outline: none; }
.test-row input:focus { border-color: var(--purple); }
.test-row.ok input { border-color: var(--green); background: #eafff0; }
.test-row.close input { border-color: var(--yellow); background: #fff9e6; }
.test-row.bad input { border-color: var(--red); background: #fff0f1; }
.test-row .fix { font-size: 13px; color: #d9930a; font-weight: 700; }

/* ---------- Progress ---------- */
.stat-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px,1fr)); gap: 16px; margin-bottom: 20px; }
.stat { background: #fff; border-radius: 18px; box-shadow: var(--shadow); padding: 18px; text-align: center; }
.stat .n { font-size: 34px; font-weight: 800; color: var(--purple); }
.stat .l { color: #6b73a0; font-size: 14px; }
.mastery-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px,1fr)); gap: 6px; }
.mastery-list .m { display: flex; justify-content: space-between; padding: 6px 10px; border-radius: 8px; background: #f2f4ff; font-size: 14px; }
.mastery-list .m.done { background: #eafff0; }

.confetti-pop { animation: pop .4s ease; }
@keyframes pop { 0%{transform:scale(.6);opacity:0} 60%{transform:scale(1.15)} 100%{transform:scale(1)} }

/* ---------- Learning mode ---------- */
.learn-stage { display: grid; place-items: center; gap: 18px; }
.learn-card {
  width: min(560px, 94vw); background: #fff; border-radius: 28px; box-shadow: var(--shadow);
  padding: 24px 24px 28px; text-align: center; border-top: 8px solid #17c3b2;
}
.shape-box { height: 300px; display: grid; place-items: center; }
.state-shape { width: 100%; height: 100%; }
.state-shape path {
  fill: var(--purple); stroke: #fff; stroke-width: 2px; stroke-linejoin: round;
  filter: drop-shadow(0 6px 12px rgba(124,92,255,.35));
  animation: pop .4s ease;
}
.learn-name {
  font-size: 42px; font-weight: 800; margin-top: 14px; min-height: 50px; color: var(--ink);
  opacity: 0; transform: translateY(8px); transition: opacity .35s, transform .35s;
}
.learn-name.show { opacity: 1; transform: translateY(0); }
.learn-cap {
  font-size: 28px; font-weight: 700; color: var(--pink); min-height: 38px;
  opacity: 0; transform: translateY(8px); transition: opacity .35s, transform .35s;
}
.learn-cap.show { opacity: 1; transform: translateY(0); }
.learn-cap .lbl { color: #9aa2c4; font-size: 17px; font-weight: 700; }
.learn-controls { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.learn-progress { color: #9aa2c4; font-weight: 700; font-size: 14px; }