/* ============================================
   NEURO FLASHCARDS — STYLES
   Modern, responsive, accessible
   ============================================ */

*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}

:root{
  --font: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont,
          system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', sans-serif;
  --r-sm: 10px; --r-md: 14px; --r-lg: 20px; --r-xl: 28px;
  --t-fast: 160ms cubic-bezier(.4,0,.2,1);
  --t-mid: 260ms cubic-bezier(.4,0,.2,1);
  --t-slow: 520ms cubic-bezier(.22,.61,.36,1);
  --shadow-1: 0 1px 2px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.04);
  --shadow-2: 0 6px 16px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-3: 0 20px 50px rgba(0,0,0,.18), 0 6px 14px rgba(0,0,0,.08);
}

/* ---------- THEMES ---------- */
body[data-theme="light"]{
  --bg: #f4f5fb;
  --bg-grad-1: #eef0ff;
  --bg-grad-2: #f7eff5;
  --surface: #ffffff;
  --surface-2: #f8f9fd;
  --surface-3: #eef0f7;
  --text: #161a2b;
  --text-2: #4b5168;
  --text-3: #8c92a8;
  --border: #e3e6f0;
  --border-2: #d0d4e3;
  --primary: #5b4bdb;
  --primary-2: #7a6cf0;
  --primary-soft: #ecebff;
  --accent: #ec5d77;
  --accent-soft: #ffe7ec;
  --success: #1aa179;
  --success-soft: #d8f5ea;
  --warn: #e08a2b;
  --warn-soft: #ffeed4;
  --danger: #d33b4f;
  --must-bg: #fff1e6;
  --must-fg: #c25608;
  --core-bg: #eaf2ff;
  --core-fg: #2c5dbf;
}
body[data-theme="dark"]{
  --bg: #07091a;
  --bg-grad-1: #0a1030;
  --bg-grad-2: #1a0a24;
  --surface: #11152b;
  --surface-2: #161b35;
  --surface-3: #1d2342;
  --text: #ecedf6;
  --text-2: #adb3cf;
  --text-3: #6f779a;
  --border: #232847;
  --border-2: #2e3458;
  --primary: #8b7dff;
  --primary-2: #a89cff;
  --primary-soft: rgba(139,125,255,.16);
  --accent: #ff7d96;
  --accent-soft: rgba(255,125,150,.16);
  --success: #41d4a4;
  --success-soft: rgba(65,212,164,.16);
  --warn: #ffb556;
  --warn-soft: rgba(255,181,86,.16);
  --danger: #ff6b7e;
  --must-bg: rgba(255,160,90,.16);
  --must-fg: #ffb27a;
  --core-bg: rgba(116,160,255,.16);
  --core-fg: #93b6ff;
}

/* ---------- BASE ---------- */
body{
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  min-height: 100dvh;
  font-feature-settings: 'ss01','cv11';
  letter-spacing: -0.005em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body::before{
  content:"";
  position:fixed; inset:0;
  background:
    radial-gradient(900px 600px at 10% -10%, var(--bg-grad-1), transparent 60%),
    radial-gradient(700px 500px at 100% 0%, var(--bg-grad-2), transparent 60%);
  pointer-events:none; z-index:0;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select{font-family:inherit;color:inherit}
h1,h2,h3{margin:0;letter-spacing:-0.02em}
.hidden{display:none !important}
kbd{
  font: inherit; font-size: 11px;
  padding: 2px 6px; border-radius: 5px;
  background: var(--surface-3); color: var(--text-2);
  border: 1px solid var(--border);
}

/* ---------- APP LAYOUT ---------- */
.app{
  position: relative; z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 28px 120px;
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 20px;
  min-height: 100vh; min-height: 100dvh;
}

/* ---------- TOPBAR ---------- */
.topbar{
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 14px 20px;
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
}
.topbar__brand{display:flex;align-items:center;gap:14px;min-width:0}
.logo{
  width: 44px; height: 44px;
  border-radius: 12px;
  display:grid; place-items:center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--primary) 35%, transparent);
  flex: none;
}
.logo svg{width:26px;height:26px}
.topbar__titles{min-width:0}
.topbar__titles h1{
  font-size: 19px; font-weight: 800;
  background: linear-gradient(120deg, var(--text), color-mix(in srgb, var(--primary) 80%, var(--text)));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  white-space: nowrap;
}
.topbar__sub{font-size: 12.5px; color: var(--text-3); font-weight: 500}

.topbar__stats{display:flex;justify-content:center;gap:8px}
.stat{
  display:grid; gap:2px; padding: 6px 14px;
  border-radius: 12px; min-width: 64px; text-align:center;
  background: var(--surface-2); border: 1px solid var(--border);
}
.stat__val{font-size:18px; font-weight: 800; line-height:1; color: var(--text)}
.stat__val--known{color: var(--success)}
.stat__val--review{color: var(--warn)}
.stat__lbl{font-size: 11px; color: var(--text-3); font-weight: 600}

.topbar__actions{display:flex; gap:8px}
.iconbtn{
  width: 40px; height: 40px;
  border-radius: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  display: grid; place-items: center;
  transition: var(--t-fast);
  color: var(--text-2);
}
.iconbtn:hover{background: var(--surface-3); color: var(--text); transform: translateY(-1px)}
.iconbtn svg{width:18px;height:18px}
body[data-theme="dark"] .icon-sun{display:block} body[data-theme="dark"] .icon-moon{display:none}
body[data-theme="light"] .icon-sun{display:none} body[data-theme="light"] .icon-moon{display:block}

/* ---------- TABS ---------- */
.tabs{
  display: flex;
  gap: 6px;
  padding: 6px;
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: fit-content;
  box-shadow: var(--shadow-1);
}
.tab{
  display: flex; align-items: center; gap: 8px;
  padding: 9px 18px;
  font-size: 14px; font-weight: 600;
  color: var(--text-2);
  border-radius: 11px;
  transition: var(--t-fast);
  white-space: nowrap;
}
.tab:hover{color: var(--text); background: var(--surface-2)}
.tab.is-active{
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 4px 12px color-mix(in srgb, var(--primary) 35%, transparent);
}
.tab.is-active .tab__icon{filter: brightness(1.2)}
.tab__icon{font-size: 15px}

/* ---------- MAIN VIEWS ---------- */
.view{display:none}
.view.is-active{display:block; animation: fadeUp .35s cubic-bezier(.22,.61,.36,1) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(6px)} to{opacity:1;transform:none}}

/* ============================================
   STUDY VIEW
   ============================================ */
.study{display:grid; gap: 20px}

.filterbar{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 16px;
  box-shadow: var(--shadow-1);
}
.filterbar__row{
  display:flex; flex-wrap: wrap; gap: 10px; align-items: flex-end;
}
.filterbar__spacer{flex:1}
.select{
  display: grid; gap:5px;
  font-size: 11.5px; color: var(--text-3); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.select select{
  appearance: none;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 9px 32px 9px 14px;
  font-size: 14px; font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: var(--t-fast);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%238c92a8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat;
  background-position: right 10px center;
  min-width: 150px;
}
.select select:hover{border-color: var(--border-2)}
.select select:focus{outline: 2px solid var(--primary); outline-offset: 1px}

.btn{
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px;
  font-size: 13.5px; font-weight: 600;
  border-radius: 11px;
  transition: var(--t-fast);
  white-space: nowrap;
  border: 1px solid transparent;
}
.btn svg{width:16px;height:16px}
.btn--ghost{background: var(--surface-2); border-color: var(--border); color: var(--text-2)}
.btn--ghost:hover{background: var(--surface-3); color: var(--text)}
.btn--primary{background: linear-gradient(135deg, var(--primary), var(--primary-2)); color:#fff;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--primary) 35%, transparent)}
.btn--primary:hover{transform: translateY(-1px); box-shadow: 0 6px 18px color-mix(in srgb, var(--primary) 45%, transparent)}
.btn--lg{padding: 13px 28px; font-size: 15px; border-radius: 13px}

.filterbar__progress{
  display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center;
  margin-top: 14px;
}
.progress{
  height: 8px; background: var(--surface-3); border-radius: 99px; overflow: hidden;
}
.progress__bar{
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 99px;
  transition: width var(--t-mid);
  width: 0;
}
.progress__label{
  font-size: 13px; font-weight: 700; color: var(--text-2);
  font-variant-numeric: tabular-nums;
}

/* ---------- Flashcard ---------- */
.cardstage{
  position: relative;
  perspective: 1800px;
  min-height: 420px;
  display: grid;
  place-items: center;
  padding: 4px;
}
.flashcard{
  width: 100%;
  max-width: 760px;
  aspect-ratio: 5 / 3.2;
  position: relative;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform var(--t-slow);
}
.flashcard.is-flipped{transform: rotateY(180deg)}
.flashcard__inner{
  position: absolute; inset: 0;
  transform-style: preserve-3d;
}
.flashcard__face{
  position: absolute; inset: 0;
  border-radius: var(--r-xl);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-3);
  padding: 32px 36px 24px;
  display: flex; flex-direction: column;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  overflow: hidden;
}
.flashcard__face--front::before,
.flashcard__face--back::before{
  content:""; position:absolute; inset:0;
  background: radial-gradient(600px 200px at 80% -20%, var(--primary-soft), transparent 60%);
  pointer-events:none;
}
.flashcard__face--back{
  transform: rotateY(180deg);
  background:
    radial-gradient(700px 220px at 20% 120%, var(--accent-soft), transparent 60%),
    var(--surface);
}
.flashcard__chips{display:flex; gap:8px; flex-wrap: wrap; position:relative; z-index:1}
.chip{
  display: inline-flex; align-items: center;
  font-size: 11.5px; font-weight: 700;
  padding: 4px 10px; border-radius: 99px;
  background: var(--surface-3); color: var(--text-2);
  border: 1px solid var(--border);
  letter-spacing: 0.01em;
}
.chip--section{background: var(--primary-soft); color: var(--primary); border-color: transparent}
.chip--priority[data-p="Must"]{background: var(--must-bg); color: var(--must-fg); border-color: transparent}
.chip--priority[data-p="Core"]{background: var(--core-bg); color: var(--core-fg); border-color: transparent}
.chip--page{font-variant-numeric: tabular-nums}

.flashcard__sub{
  margin-top: 14px;
  font-size: 12.5px; font-weight: 700; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--text-3);
  position:relative; z-index:1;
}
.flashcard__qa{
  flex: 1;
  display: flex; align-items: center;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.015em;
  color: var(--text);
  position:relative; z-index:1;
  padding: 12px 0;
  word-break: keep-all;
  overflow-y: auto;
}
.flashcard__qa--answer{
  font-size: clamp(17px, 2.1vw, 22px);
  font-weight: 600;
  color: var(--text);
  align-items: flex-start;
}
.flashcard__hint{
  font-size: 12.5px; color: var(--text-3); font-weight: 500;
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  position:relative; z-index:1;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
}

.empty{
  text-align: center; padding: 60px 24px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-xl); width: 100%; max-width: 600px;
}
.empty__icon{font-size: 56px; margin-bottom: 12px}
.empty h3{font-size: 22px; margin-bottom: 6px}
.empty p{color: var(--text-2); margin: 0; line-height: 1.6}

/* ---------- Controls ---------- */
.controls{
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 10px;
  align-items: center;
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}
.ctrlbtn{
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: grid; place-items: center;
  transition: var(--t-fast);
  color: var(--text-2);
  box-shadow: var(--shadow-1);
}
.ctrlbtn:hover{background: var(--surface-2); color: var(--text); transform: translateY(-1px)}
.ctrlbtn svg{width:20px;height:20px}
.ctrlbtn--flip{
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--primary) 35%, transparent);
}
.ctrlbtn--flip:hover{color:#fff}

.ratebar{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
}
.rate{
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 12px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 14px; font-weight: 700;
  color: var(--text);
  transition: var(--t-fast);
  box-shadow: var(--shadow-1);
}
.rate:hover{transform: translateY(-1px); box-shadow: var(--shadow-2)}
.rate__key{
  font-size: 11px; font-weight: 800;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--surface-3); color: var(--text-3);
}
.rate--again{color: var(--danger); border-color: color-mix(in srgb, var(--danger) 30%, var(--border))}
.rate--again:hover{background: color-mix(in srgb, var(--danger) 8%, var(--surface))}
.rate--hard{color: var(--warn); border-color: color-mix(in srgb, var(--warn) 30%, var(--border))}
.rate--hard:hover{background: color-mix(in srgb, var(--warn) 8%, var(--surface))}
.rate--easy{color: var(--success); border-color: color-mix(in srgb, var(--success) 30%, var(--border))}
.rate--easy:hover{background: color-mix(in srgb, var(--success) 8%, var(--surface))}

/* ============================================
   CARDS LIST VIEW
   ============================================ */
.cards-view{display:grid; gap: 16px}
.searchbar{
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-1);
}
.searchbar svg{width:18px;height:18px;color:var(--text-3); flex:none}
.searchbar input{
  flex: 1; min-width: 0;
  border: none; background: none; outline: none;
  font-size: 15px; font-weight: 500;
}
.searchbar input::placeholder{color: var(--text-3)}
.searchbar__count{
  font-size: 12px; font-weight: 700;
  padding: 3px 9px; border-radius: 99px;
  background: var(--primary-soft); color: var(--primary);
  font-variant-numeric: tabular-nums;
  flex: none;
}

.cardlist{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}
.cardrow{
  position: relative;
  padding: 18px 18px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  display: grid; gap: 10px;
  cursor: pointer;
  transition: var(--t-fast);
}
.cardrow:hover{transform: translateY(-2px); box-shadow: var(--shadow-2); border-color: var(--border-2)}
.cardrow__head{display:flex; gap:6px; flex-wrap: wrap; align-items:center}
.cardrow__id{font-size:11px;color:var(--text-3);font-weight:700;font-variant-numeric:tabular-nums; margin-left:auto}
.cardrow__q{font-size:14.5px; font-weight: 700; line-height:1.5; color: var(--text); word-break: keep-all}
.cardrow__a{
  font-size:13.5px; color: var(--text-2); line-height:1.55;
  display: none;
  padding-top: 10px; border-top: 1px dashed var(--border);
  word-break: keep-all;
}
.cardrow.is-open .cardrow__a{display:block}
.cardrow__status{
  position: absolute; top: 14px; right: 14px;
  width: 8px; height: 8px; border-radius: 99px;
  background: var(--border-2);
}
.cardrow[data-status="known"] .cardrow__status{background: var(--success)}
.cardrow[data-status="review"] .cardrow__status{background: var(--warn)}

/* ============================================
   QUIZ VIEW
   ============================================ */
.quiz{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-1);
  padding: 32px;
  max-width: 820px; margin: 0 auto;
}
.quiz__intro h2{font-size: 28px; margin-bottom: 8px}
.quiz__intro > p{color: var(--text-2); margin: 0 0 24px; line-height: 1.6}
.quiz__form{
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px; margin-bottom: 24px;
}
.quiz__head{
  display: flex; gap: 20px; align-items: center; margin-bottom: 24px;
}
.quiz__head > div:first-child{flex: 1}
.quiz__progressLabel{font-size: 12.5px; color: var(--text-3); font-weight: 700; margin-bottom: 6px}
.quiz__score{
  display: flex; align-items: center; gap: 8px;
  font-size: 18px; font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.quiz__correct{color: var(--success)}
.quiz__wrong{color: var(--danger)}
.quiz__sep{color: var(--text-3)}

.quiz__q{margin-bottom: 20px}
.quiz__qchips{display:flex; gap:8px; flex-wrap:wrap; margin-bottom: 12px}
.quiz__q h3{
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700; line-height: 1.5;
  word-break: keep-all;
}
.quiz__choices{display: grid; gap: 10px; margin-bottom: 20px}
.choice{
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 16px;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: 13px;
  text-align: left;
  font-size: 14.5px; font-weight: 500;
  color: var(--text); line-height: 1.55;
  transition: var(--t-fast);
  word-break: keep-all;
}
.choice:hover:not(:disabled){border-color: var(--primary); background: var(--primary-soft); transform: translateX(2px)}
.choice__letter{
  flex: none;
  width: 28px; height: 28px;
  border-radius: 8px;
  display: grid; place-items: center;
  background: var(--surface-3);
  font-size: 13px; font-weight: 800;
  color: var(--text-2);
}
.choice.is-correct{border-color: var(--success); background: var(--success-soft); color: var(--text)}
.choice.is-correct .choice__letter{background: var(--success); color: #fff}
.choice.is-wrong{border-color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, var(--surface)); color: var(--text)}
.choice.is-wrong .choice__letter{background: var(--danger); color: #fff}
.choice:disabled{cursor: default}

.quiz__foot{display:flex; justify-content: space-between; gap: 10px; align-items: center}

.quiz__result{text-align: center; padding: 24px 0}
.quiz__resultIcon{font-size: 80px; margin-bottom: 8px}
.quiz__result h2{font-size: 32px; margin-bottom: 18px}
.quiz__resultScore{
  display: grid; gap: 4px;
  font-variant-numeric: tabular-nums;
  margin-bottom: 28px;
}
.quiz__resultScore span{font-size: 64px; font-weight: 800; letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.quiz__resultScore small{color: var(--text-2); font-size: 14px}
.quiz__resultActions{display: flex; gap: 10px; justify-content: center; flex-wrap: wrap}

/* ============================================
   PROGRAM VIEW
   ============================================ */
.program{display:grid; gap: 22px; max-width: 980px; margin: 0 auto}
.program__hero{
  padding: 28px 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: var(--r-xl);
  box-shadow: 0 16px 40px color-mix(in srgb, var(--primary) 25%, transparent);
}
.program__hero h2{font-size: 28px; font-weight: 800; margin-bottom: 8px}
.program__hero p{margin:0; font-size: 14.5px; line-height: 1.6; opacity: 0.92}

.program__principles{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}
.principle{
  padding: 18px 20px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
}
.principle__head{font-size: 14px; font-weight: 800; margin-bottom: 6px}
.principle p{margin:0; font-size: 13.5px; color: var(--text-2); line-height: 1.6}

.program__timeline{display:grid; gap: 12px}
.dayrow{
  position: relative;
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 18px;
  padding: 22px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
}
.dayrow__num{
  display: grid; place-items: center;
  width: 64px; height: 64px;
  background: linear-gradient(135deg, var(--primary-soft), var(--accent-soft));
  border-radius: 18px;
  font-size: 22px; font-weight: 800;
  color: var(--primary);
}
.dayrow__num small{font-size: 10px; color: var(--text-3); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; display: block; margin-top: -2px}
.dayrow__body{display: grid; gap: 6px}
.dayrow__title{font-size: 16px; font-weight: 800; color: var(--text)}
.dayrow__meta{
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px 18px;
  font-size: 13.5px; line-height: 1.5;
}
.dayrow__meta dt{color: var(--text-3); font-weight: 700; font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.04em; margin: 0}
.dayrow__meta dd{margin: 2px 0 0; color: var(--text-2); word-break: keep-all}

/* ============================================
   STATS VIEW
   ============================================ */
.stats{display: grid; gap: 24px}
.stats__overview{
  display: grid;
  grid-template-columns: minmax(260px, 320px) 1fr;
  gap: 16px;
  align-items: stretch;
}
.bigcard{
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-xl); padding: 24px;
  box-shadow: var(--shadow-1);
  display: grid; gap: 14px; place-items: center;
  text-align: center;
}
.bigcard__lbl{font-size: 12.5px; color: var(--text-3); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em}
.ring{position: relative; width: 180px; height: 180px}
.ring svg{width: 100%; height: 100%; transform: rotate(-90deg)}
.ring__bg{fill: none; stroke: var(--surface-3); stroke-width: 12}
.ring__fg{
  fill: none; stroke: url(#ringGradient); stroke-width: 12; stroke-linecap: round;
  stroke-dasharray: 326.7; stroke-dashoffset: 326.7;
  transition: stroke-dashoffset var(--t-slow);
}
.ring svg defs{display:block}
.ring__center{position: absolute; inset: 0; display: grid; place-content: center; text-align: center}
.ring__center strong{font-size: 36px; font-weight: 800; letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.ring__center small{font-size: 12.5px; color: var(--text-2); font-weight: 600; display: block; margin-top: 2px; font-variant-numeric: tabular-nums}

.stats__cards{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.statcard{
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 18px 20px;
  box-shadow: var(--shadow-1);
  display: grid; gap: 4px;
  position: relative;
  overflow: hidden;
}
.statcard::before{
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--text-3);
}
.statcard--known::before{background: var(--success)}
.statcard--review::before{background: var(--warn)}
.statcard--new::before{background: var(--primary)}
.statcard--streak::before{background: var(--accent)}
.statcard__lbl{font-size: 11.5px; color: var(--text-3); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em}
.statcard strong{font-size: 32px; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1}
.statcard small{font-size: 12px; color: var(--text-3); font-weight: 500}

.stats__sections h3{font-size: 17px; margin-bottom: 12px; font-weight: 800}
.sectionbars{display: grid; gap: 10px}
.sectionbar{
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 14px 16px;
  box-shadow: var(--shadow-1);
}
.sectionbar__head{
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 8px;
}
.sectionbar__name{font-size: 14px; font-weight: 700}
.sectionbar__count{font-size: 12.5px; color: var(--text-3); font-weight: 600; font-variant-numeric: tabular-nums}
.sectionbar__track{height: 8px; background: var(--surface-3); border-radius: 99px; overflow: hidden}
.sectionbar__fill{
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 99px;
  transition: width var(--t-mid);
}

/* ============================================
   BOTTOM NAV (mobile)
   ============================================ */
.bottomnav{
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
  z-index: 100;
  justify-content: space-around;
}
.bottomnav__item{
  flex: 1;
  display: grid; place-items: center; gap: 4px;
  padding: 8px 4px;
  border-radius: 12px;
  color: var(--text-3);
  font-size: 11px; font-weight: 700;
  transition: var(--t-fast);
}
.bottomnav__item svg{width:22px;height:22px}
.bottomnav__item.is-active{color: var(--primary)}
.bottomnav__item:hover:not(.is-active){color: var(--text-2); background: var(--surface-2)}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Tablet */
@media (max-width: 980px){
  .app{padding: 18px 18px 96px}
  .topbar{grid-template-columns: auto 1fr auto; padding: 12px 14px}
  .topbar__titles h1{font-size: 17px}
  .topbar__stats{gap: 6px}
  .stat{padding: 5px 10px; min-width: 56px}
  .stat__val{font-size: 16px}
  .tabs{display:none}
  .bottomnav{display: flex}
  .stats__overview{grid-template-columns: 1fr}
  .quiz{padding: 24px}
  .cardstage{min-height: 360px}
}

/* Mobile */
@media (max-width: 640px){
  body{font-size: 14px}
  .app{padding: 14px 14px 96px; gap: 14px}
  .topbar{padding: 10px 12px; gap: 10px}
  .logo{width: 38px; height: 38px}
  .logo svg{width: 22px; height: 22px}
  .topbar__titles h1{font-size: 15px}
  .topbar__sub{font-size: 11px}
  .topbar__stats{display: none}
  .iconbtn{width: 36px; height: 36px}

  .filterbar{padding: 12px}
  .filterbar__row{gap: 8px}
  .select select{padding: 8px 28px 8px 12px; font-size: 13.5px; min-width: 0; width: 100%}
  .select{flex: 1; min-width: 130px}
  .filterbar__spacer{display:none}
  .btn{padding: 8px 12px; font-size: 13px}
  .btn span{display: none}
  .btn svg{width: 16px; height: 16px}

  .cardstage{min-height: 340px; padding: 0}
  .flashcard{aspect-ratio: 3 / 4; max-width: 100%}
  .flashcard__face{padding: 22px 22px 18px; border-radius: 22px}
  .flashcard__qa{font-size: 18px; padding: 8px 0}
  .flashcard__qa--answer{font-size: 16px}
  .flashcard__hint{font-size: 11.5px}

  .controls{grid-template-columns: 1fr; gap: 8px}
  .ctrlbtn{width: 100%; height: 44px}
  .ctrlbtn:not(.ctrlbtn--flip){display: none}
  .ratebar{order: 2}
  .ctrlbtn--flip{order: 1}
  .rate{padding: 12px 8px; font-size: 13px; flex-direction: column; gap: 2px}
  .rate__key{font-size: 10px; padding: 1px 5px}

  .cardlist{grid-template-columns: 1fr; gap: 10px}
  .cardrow{padding: 14px}

  .quiz{padding: 20px 18px; border-radius: 18px}
  .quiz__intro h2{font-size: 22px}
  .choice{padding: 12px 14px; font-size: 14px}
  .quiz__form{grid-template-columns: 1fr}

  .program__hero{padding: 22px 20px}
  .program__hero h2{font-size: 22px}
  .dayrow{grid-template-columns: 56px 1fr; padding: 16px; gap: 14px}
  .dayrow__num{width: 56px; height: 56px; font-size: 18px}
  .dayrow__meta{grid-template-columns: 1fr; gap: 8px}

  .stats__cards{grid-template-columns: 1fr 1fr}
  .statcard{padding: 14px 16px}
  .statcard strong{font-size: 26px}
  .ring{width: 150px; height: 150px}
}

@media (max-width: 380px){
  .app{padding: 12px 10px 92px}
  .flashcard__face{padding: 18px}
  .stats__cards{grid-template-columns: 1fr}
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.01ms !important; transition-duration:0.01ms !important}
}