:root {
  --bg: #f5f3ff;
  --surface: #ffffff;
  --surface-2: #eeeaff;
  --text: #1e1b3a;
  --muted: #6b6890;
  --primary: #6c5ce7;
  --primary-2: #a29bfe;
  --pink: #e84393;
  --good: #00b894;
  --warn: #fdcb6e;
  --bad: #e17055;
  --border: #e3dffb;
  --shadow: 0 6px 24px rgba(76, 61, 190, .12);
  --a1: #00b894; --a2: #0984e3; --b1: #e17055; --b2: #8e44ad; --b2x: #d35400; --c1: #c2185b;
  --radius: 20px;
  --tabbar-h: 64px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12111c;
    --surface: #1d1b2e;
    --surface-2: #2a2742;
    --text: #f1efff;
    --muted: #a6a3c7;
    --border: #2f2c4a;
    --shadow: 0 6px 24px rgba(0, 0, 0, .4);
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Sukhumvit Set", "Thonburi", "Noto Sans Thai", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  overscroll-behavior-y: none;
}
button, input, select { font: inherit; color: inherit; }
button { touch-action: manipulation; cursor: pointer; }

#app { display: flex; flex-direction: column; height: 100dvh; max-width: 640px; margin: 0 auto; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(env(safe-area-inset-top) + 8px) 20px 8px;
  flex: none;
}
.topbar h1 { font-size: 26px; margin: 0; font-weight: 800; letter-spacing: -.3px; }
.streak { background: var(--surface); border-radius: 999px; padding: 6px 14px; font-weight: 700; box-shadow: var(--shadow); }

.view {
  flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch;
  padding: 8px 16px calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 20px);
}

.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
  display: flex; justify-content: space-around;
  max-width: 640px; margin: 0 auto;
  padding: 6px 4px calc(env(safe-area-inset-bottom) + 6px);
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-top: 1px solid var(--border);
}
.tabbar button {
  flex: 1; background: none; border: 0; padding: 4px 0; display: flex; flex-direction: column; align-items: center; gap: 2px;
  font-size: 11px; color: var(--muted); font-weight: 600;
}
.tabbar .ti { font-size: 24px; line-height: 1; filter: grayscale(1); opacity: .6; transition: .2s; }
.tabbar button.active { color: var(--primary); }
.tabbar button.active .ti { filter: none; opacity: 1; transform: translateY(-2px); }

/* generic */
.card-box { background: var(--surface); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); margin-bottom: 14px; }
.h2 { font-size: 20px; font-weight: 800; margin: 18px 4px 10px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.row { display: flex; gap: 10px; align-items: center; }
.grow { flex: 1; }
.center { text-align: center; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 0; border-radius: 16px; padding: 14px 18px; min-height: 52px;
  background: var(--surface-2); color: var(--text); font-weight: 700; font-size: 17px;
  transition: transform .1s;
}
.btn:active { transform: scale(.97); }
.btn.primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; box-shadow: 0 8px 20px rgba(108, 92, 231, .35); }
.btn.block { width: 100%; }
.btn.ghost { background: transparent; border: 2px solid var(--border); }
.btn.danger { background: var(--bad); color: #fff; }
.btn:disabled { opacity: .5; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 2px solid var(--border); background: var(--surface); border-radius: 999px; padding: 8px 16px; font-weight: 700; font-size: 15px;
}
.chip.on { background: var(--primary); border-color: var(--primary); color: #fff; }
.lv { display: inline-block; font-size: 12px; font-weight: 800; padding: 2px 8px; border-radius: 8px; color: #fff; }
.lv.A1 { background: var(--a1); } .lv.A2 { background: var(--a2); } .lv.B1 { background: var(--b1); } .lv.B2 { background: var(--b2); }
.lv.B2x { background: var(--b2x); } .lv.C1 { background: var(--c1); }
.pos { font-size: 13px; color: var(--muted); font-style: italic; }

/* home */
.hero {
  background: linear-gradient(135deg, var(--primary), #a29bfe 60%, #fd79a8);
  color: #fff; border-radius: 24px; padding: 22px; box-shadow: var(--shadow); margin-bottom: 16px;
}
.hero .big { font-size: 44px; font-weight: 900; line-height: 1; }
.hero .stats { display: flex; gap: 10px; margin: 16px 0; }
.hero .stat { flex: 1; background: rgba(255,255,255,.18); border-radius: 14px; padding: 10px; text-align: center; }
.hero .stat b { display: block; font-size: 24px; }
.hero .stat span { font-size: 12px; opacity: .9; }
.hero .btn { background: #fff; color: var(--primary); width: 100%; }
.goal-bar { height: 10px; border-radius: 99px; background: rgba(255,255,255,.3); overflow: hidden; margin-top: 8px; }
.goal-bar > div { height: 100%; background: #fff; border-radius: 99px; transition: width .4s; }

.lvl-row { display: flex; align-items: center; gap: 12px; padding: 10px 0; }
.lvl-row + .lvl-row { border-top: 1px solid var(--border); }
.bar { position: relative; height: 10px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.bar .l { position: absolute; inset: 0 auto 0 0; background: var(--primary-2); }
.bar .m { position: absolute; inset: 0 auto 0 0; background: var(--good); }

.game-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.game-tile {
  background: var(--surface); border: 0; border-radius: var(--radius); padding: 18px 14px; text-align: left; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 6px; min-height: 120px;
}
.game-tile .gi { font-size: 34px; }
.game-tile b { font-size: 17px; }
.game-tile span { font-size: 13px; color: var(--muted); }
.game-tile:active { transform: scale(.97); }

/* flashcards */
.session-top { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.progress { flex: 1; height: 8px; background: var(--surface-2); border-radius: 99px; overflow: hidden; }
.progress > div { height: 100%; background: linear-gradient(90deg, var(--primary), var(--pink)); transition: width .3s; }
.icon-btn { width: 44px; height: 44px; border-radius: 50%; border: 0; background: var(--surface); box-shadow: var(--shadow); font-size: 20px; display: inline-flex; align-items: center; justify-content: center; flex: none; }

.stage { perspective: 1200px; height: min(56dvh, 460px); margin-bottom: 16px; position: relative; }
.fc { position: absolute; inset: 0; transition: transform .45s cubic-bezier(.2, .8, .2, 1); transform-style: preserve-3d; touch-action: pan-y; user-select: none; -webkit-user-select: none; }
.fc.flip .fc-inner { transform: rotateY(180deg); }
.fc-inner { position: absolute; inset: 0; transition: transform .45s; transform-style: preserve-3d; }
.face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: var(--surface); border-radius: 28px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 24px; text-align: center;
}
.face.back { transform: rotateY(180deg); }
.face .top { position: absolute; top: 18px; left: 18px; right: 18px; display: flex; justify-content: space-between; align-items: center; }
.face .word { font-size: clamp(34px, 11vw, 52px); font-weight: 800; letter-spacing: -.5px; word-break: break-word; }
.face .ipa { color: var(--muted); font-size: 19px; margin-top: 6px; }
.face .th { font-size: clamp(26px, 8vw, 36px); font-weight: 800; color: var(--primary); }
.face .hint { position: absolute; bottom: 18px; font-size: 13px; color: var(--muted); }
.face .link { margin-top: 14px; font-size: 14px; color: var(--primary); text-decoration: none; font-weight: 600; }
.speak { margin-top: 18px; width: 60px; height: 60px; border-radius: 50%; border: 0; background: var(--surface-2); font-size: 26px; }
.speak:active { transform: scale(.92); }
.swipe-tag { position: absolute; top: 40%; font-size: 28px; font-weight: 900; padding: 6px 14px; border-radius: 12px; border: 4px solid; opacity: 0; transition: opacity .1s; z-index: 2; }
.swipe-tag.l { left: 18px; color: var(--bad); border-color: var(--bad); transform: rotate(-12deg); }
.swipe-tag.r { right: 18px; color: var(--good); border-color: var(--good); transform: rotate(12deg); }

.grade { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.grade .btn { flex-direction: column; gap: 0; padding: 8px 4px; min-height: 64px; font-size: 15px; color: #fff; }
.grade .btn small { font-size: 11px; opacity: .9; font-weight: 600; }
.g-again { background: var(--bad) !important; }
.g-hard { background: #f0932b !important; }
.g-good { background: var(--good) !important; }
.g-easy { background: var(--a2) !important; }

/* quiz */
.q-prompt { text-align: center; padding: 26px 16px; }
.q-prompt .word { font-size: clamp(32px, 10vw, 46px); font-weight: 800; }
.q-prompt .th { font-size: clamp(24px, 7vw, 32px); font-weight: 800; color: var(--primary); }
.options { display: grid; gap: 10px; }
.opt {
  width: 100%; text-align: left; border: 2px solid var(--border); background: var(--surface); border-radius: 16px;
  padding: 14px 16px; font-size: 17px; font-weight: 600; min-height: 56px;
}
.opt.correct { border-color: var(--good); background: color-mix(in srgb, var(--good) 18%, var(--surface)); }
.opt.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 18%, var(--surface)); animation: shake .3s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.combo { font-weight: 800; color: var(--pink); }
.reveal { margin-top: 12px; text-align: center; min-height: 28px; font-weight: 600; }

.spell-input {
  width: 100%; font-size: 22px; padding: 14px 16px; border-radius: 16px; border: 2px solid var(--border); background: var(--surface);
  text-align: center; font-weight: 700; outline: none;
}
.spell-input:focus { border-color: var(--primary); }
.spell-input.ok { border-color: var(--good); }
.spell-input.no { border-color: var(--bad); animation: shake .3s; }

.match-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tile {
  min-height: 72px; border-radius: 16px; border: 2px solid var(--border); background: var(--surface); font-weight: 700; font-size: 16px; padding: 8px;
  transition: transform .15s, opacity .3s;
}
.tile.sel { border-color: var(--primary); background: var(--surface-2); transform: scale(1.03); }
.tile.done { opacity: 0; pointer-events: none; transform: scale(.8); }
.tile.no { border-color: var(--bad); animation: shake .3s; }
.tile.th { font-size: 15px; }

.result-emoji { font-size: 64px; text-align: center; }
.wrong-list .wl { display: flex; justify-content: space-between; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--border); }

/* list */
.search {
  width: 100%; font-size: 17px; padding: 12px 16px; border-radius: 14px; border: 0; background: var(--surface); box-shadow: var(--shadow); outline: none; margin-bottom: 10px;
}
.wrow { display: flex; align-items: center; gap: 12px; padding: 12px 4px; border-bottom: 1px solid var(--border); }
.wrow .w { font-weight: 700; }
.wrow .t { color: var(--muted); font-size: 15px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--surface-2); flex: none; border: 1px solid var(--border); }
.dot.learning { background: var(--warn); border-color: var(--warn); }
.dot.mastered { background: var(--good); border-color: var(--good); }

/* settings */
.set-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 0; }
.set-row + .set-row { border-top: 1px solid var(--border); }
.switch { position: relative; width: 52px; height: 32px; flex: none; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span { position: absolute; inset: 0; background: var(--surface-2); border-radius: 99px; transition: .2s; }
.switch span::before { content: ""; position: absolute; width: 26px; height: 26px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: .2s; box-shadow: 0 2px 4px rgba(0,0,0,.2); }
.switch input:checked + span { background: var(--good); }
.switch input:checked + span::before { transform: translateX(20px); }
select.sel { background: var(--surface-2); border: 0; border-radius: 10px; padding: 8px 10px; font-size: 16px; }

.toast {
  position: fixed; left: 50%; bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 20px); transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 99px; font-weight: 600; font-size: 15px;
  opacity: 0; pointer-events: none; transition: .25s; z-index: 50; max-width: 90vw; text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.install-tip { border: 2px dashed var(--primary-2); }
.pop { animation: pop .35s; }
@keyframes pop { 0% { transform: scale(.9); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }

/* example sentence */
.example { margin-top: 14px; background: var(--surface-2); border-radius: 14px; padding: 10px 12px; text-align: left; font-size: 15px; width: 100%; }
.example .en { font-weight: 600; }
.example mark { background: none; color: var(--pink); font-weight: 800; }
.example .thx, .thx { color: var(--muted); font-size: 14px; margin-top: 4px; }
.say-ex { border: 0; background: none; font-size: 18px; padding: 0 4px; vertical-align: middle; }
.know-btn { margin-top: 18px; border: 2px solid var(--border); background: var(--surface); color: var(--muted); border-radius: 999px; padding: 8px 14px; font-weight: 700; font-size: 14px; }
.face .link { margin-top: 10px; }

/* cloze */
.cloze { font-size: 21px; font-weight: 600; line-height: 1.5; }
.cloze .blank { color: var(--primary); font-weight: 900; letter-spacing: 2px; }
.hint-btn { margin-top: 12px; border: 0; background: var(--surface-2); border-radius: 999px; padding: 6px 14px; font-weight: 600; font-size: 14px; }
.reveal .example { margin-top: 10px; }

/* weekly chart */
.week { display: flex; gap: 6px; align-items: flex-end; }
.wk { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.wk-n { font-size: 11px; color: var(--muted); height: 14px; }
.wk-bar { width: 100%; max-width: 28px; height: 70px; background: var(--surface-2); border-radius: 8px; display: flex; align-items: flex-end; overflow: hidden; }
.wk-bar > div { width: 100%; background: linear-gradient(180deg, var(--pink), var(--primary)); border-radius: 8px; min-height: 0; }
.wk-l { font-size: 12px; color: var(--muted); font-weight: 600; }

/* bottom sheet */
.sheet-wrap { position: fixed; inset: 0; z-index: 40; background: rgba(0, 0, 0, 0); transition: background .25s; display: flex; align-items: flex-end; justify-content: center; }
.sheet-wrap.open { background: rgba(0, 0, 0, .4); }
.sheet { width: 100%; max-width: 640px; background: var(--surface); border-radius: 24px 24px 0 0; padding: 10px 20px calc(env(safe-area-inset-bottom) + 20px); transform: translateY(100%); transition: transform .25s cubic-bezier(.2, .8, .2, 1); max-height: 85dvh; overflow-y: auto; }
.sheet-wrap.open .sheet { transform: none; }
.grab { width: 40px; height: 5px; border-radius: 3px; background: var(--border); margin: 0 auto 12px; }
.sheet-word { font-size: 32px; font-weight: 800; margin-top: 8px; }

/* confetti */
.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 60; overflow: hidden; }
.confetti span { position: absolute; top: -40px; animation: fall 2.6s ease-in forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(540deg); opacity: .8; } }

body { touch-action: manipulation; }

.backup-nag { border: 2px solid var(--warn); }

/* daily quest */
.quest { border: 2px solid color-mix(in srgb, var(--primary) 35%, transparent); }
.qbar { height: 10px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.qbar > div { height: 100%; background: linear-gradient(90deg, var(--primary), var(--pink)); border-radius: 99px; transition: width .4s; }

/* review forecast */
.fc-bar > div { background: linear-gradient(180deg, var(--warn), var(--primary)); }

/* achievements */
.ach-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; padding: 14px; }
.ach { border: 0; background: var(--surface-2); border-radius: 14px; padding: 10px 4px; display: flex; flex-direction: column; align-items: center; gap: 4px; color: var(--muted); font: inherit; }
.ach span { font-size: 26px; filter: grayscale(1); opacity: .35; }
.ach small { font-size: 11px; line-height: 1.2; text-align: center; }
.ach.on { background: color-mix(in srgb, var(--primary) 14%, var(--surface)); color: var(--text); }
.ach.on span { filter: none; opacity: 1; }

/* stars */
.star-btn { border: 0; background: none; font-size: 24px; line-height: 1; padding: 4px; color: var(--warn); cursor: pointer; }
.star-mark { font-size: 14px; }

/* speak game */
.mic { width: 96px; height: 96px; border-radius: 50%; border: 0; font-size: 44px; margin: 18px auto 8px; display: block;
  background: linear-gradient(135deg, var(--primary), var(--pink)); box-shadow: 0 8px 22px rgba(108, 92, 231, .35); }
.mic.on { animation: pulse 1s infinite; }
.mic.no { animation: shake .3s; }
.mic:disabled { opacity: .5; }
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.08); box-shadow: 0 0 0 12px color-mix(in srgb, var(--pink) 25%, transparent); } }

/* in-app guide */
.guide-link { display: flex; align-items: center; gap: 12px; width: 100%; text-align: left; border: 0; font: inherit; color: inherit; cursor: pointer; }
.guide-link > span:first-child { font-size: 28px; }
.guide details { padding: 0; overflow: hidden; }
.guide summary { list-style: none; display: flex; align-items: center; gap: 10px; padding: 16px 18px; cursor: pointer; font-size: 17px; }
.guide summary::-webkit-details-marker { display: none; }
.guide summary::after { content: '›'; margin-left: auto; color: var(--muted); font-size: 22px; transition: transform .2s; }
.guide details[open] summary::after { transform: rotate(90deg); }
.guide summary > span { font-size: 22px; }
.g-body { padding: 0 18px 16px; line-height: 1.6; }
.g-body p { margin: 8px 0; }
.g-body ul, .g-body ol { margin: 6px 0; padding-left: 22px; }
.g-body li { margin: 6px 0; }
.g-table { width: 100%; border-collapse: collapse; margin: 8px 0; font-size: 14px; }
.g-table th, .g-table td { border: 1px solid var(--border); padding: 6px; text-align: center; }
.g-table th { background: var(--surface-2); }
.g-plan { background: var(--surface-2); border-radius: 14px; padding: 12px 14px; margin-top: 10px; line-height: 1.7; }

/* home quick actions + level */
.quick { display: flex; gap: 12px; margin-bottom: 14px; }
.quick-btn { flex: 1; display: flex; flex-direction: column; align-items: flex-start; gap: 2px; padding: 14px; border: 0; border-radius: var(--radius); background: var(--surface); color: var(--text); box-shadow: var(--shadow); font: inherit; text-align: left; }
.quick-btn span { font-size: 28px; }
.quick-btn b { font-size: 17px; }
.quick-btn small { color: var(--muted); font-size: 12px; }
.quick-btn.feed-btn { background: linear-gradient(135deg, var(--pink), #fd79a8); color: #fff; }
.quick-btn.feed-btn small { color: rgba(255, 255, 255, .9); }
.quick-btn:active { transform: scale(.97); }
.lvl-card { display: flex; align-items: center; gap: 14px; }
.lvl-num { flex: none; width: 58px; height: 58px; border-radius: 50%; display: grid; place-items: center; font-weight: 900; color: #fff; background: linear-gradient(135deg, var(--primary), var(--pink)); }
.tabbar button { font-size: 10px; }

/* feed (ไถศัพท์) */
.view.feed-mode { display: flex; flex-direction: column; overflow: hidden; padding: 0 0 calc(var(--tabbar-h) + env(safe-area-inset-bottom)); }
.feed-hud { flex: none; display: flex; justify-content: space-between; align-items: center; padding: 2px 18px 6px; min-height: 26px; }
.feed { flex: 1; min-height: 0; overflow-y: auto; scroll-snap-type: y mandatory; overscroll-behavior: contain; -webkit-overflow-scrolling: touch; }
.fcard { height: 100%; scroll-snap-align: start; scroll-snap-stop: always; position: relative; padding: 8px 16px 14px; box-sizing: border-box; display: flex; }
.f-in { flex: 1; background: var(--surface); border-radius: 26px; box-shadow: var(--shadow); padding: 18px 70px 18px 18px; overflow-y: auto; display: flex; flex-direction: column; }
.f-body { margin: auto 0; text-align: center; padding: 8px 0; }
.f-tag { display: inline-block; background: var(--surface-2); color: var(--primary); font-weight: 700; font-size: 13px; border-radius: 999px; padding: 4px 12px; margin-bottom: 14px; }
.f-word { font-size: clamp(32px, 10vw, 46px); font-weight: 800; word-break: break-word; line-height: 1.15; }
.f-th { font-size: clamp(22px, 7vw, 30px); font-weight: 800; color: var(--primary); margin-top: 10px; }
.f-listen { width: 90px; height: 90px; font-size: 40px; margin: 6px auto 8px; }
.f-body .options { margin-top: 18px; }
.f-body .options.tf { display: flex; gap: 10px; }
.f-body .options.tf .opt { flex: 1; }
.f-side { position: absolute; right: 22px; bottom: 30px; display: flex; flex-direction: column; gap: 14px; }
.f-act { width: 52px; height: 58px; border: 0; border-radius: 16px; background: var(--surface-2); font-size: 24px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1px; }
.f-act small { font-size: 10px; color: var(--muted); font-weight: 600; }
.f-in > .lv { align-self: flex-start; }