/* ============================================================
   WORDFLASH — style.css
   Dark-mode premium flashcard vocabulary app
   ============================================================ */

/* ---------- Google Font (fallback handled by browser) ---------- */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=Noto+Sans+SC:wght@400;500;700&display=swap');

/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  /* Backgrounds */
  --bg-base:     #07070f;
  --bg-surface:  #0e0e1c;
  --bg-card:     #141428;
  --bg-elevated: #1c1c38;

  /* Borders */
  --border:       #252545;
  --border-light: #333360;

  /* Accent (purple-violet) */
  --accent:           #7c6ff7;
  --accent-light:     #a78bfa;
  --accent-dark:      #5b52d4;
  --accent-gradient:  linear-gradient(135deg, #6366f1 0%, #8b5cf6 55%, #a78bfa 100%);
  --accent-glow:      rgba(124, 111, 247, 0.28);

  /* Semantic colours */
  --success: #34d399;
  --danger:  #f87171;
  --warning: #fbbf24;

  /* Text */
  --text-1: #eeeeff;
  --text-2: #9898cc;
  --text-3: #555580;

  /* Radius */
  --r-sm:   8px;
  --r-md:   14px;
  --r-lg:   20px;
  --r-xl:   28px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,.35);
  --shadow-md: 0 4px 20px rgba(0,0,0,.45);
  --shadow-lg: 0 8px 48px rgba(0,0,0,.65);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-base);
  color: var(--text-1);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Ambient background glow orbs */
body::before, body::after {
  content: '';
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}
body::before {
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(99,102,241,.07) 0%, transparent 65%);
  top: -250px; left: -250px;
}
body::after {
  width: 550px; height: 550px;
  background: radial-gradient(circle, rgba(139,92,246,.055) 0%, transparent 65%);
  bottom: -180px; right: -180px;
}

/* Subtle dot grid */
body {
  background-image: radial-gradient(rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 30px 30px;
  background-attachment: fixed;
}

/* ============================================================
   LAYOUT
   ============================================================ */
#app { min-height: 100vh; position: relative; z-index: 1; }

.view {
  display: none;
  min-height: 100vh;
  flex-direction: column;
  animation: viewIn .3s ease;
}
.view.active { display: flex; }

@keyframes viewIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   SHARED HEADER
   ============================================================ */
.app-header {
  padding: 14px 28px;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(7,7,15,.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.header-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  font-size: 26px;
  filter: drop-shadow(0 0 14px rgba(124,111,247,.75));
}
.logo-text {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -1px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header-sub {
  font-size: 12px;
  color: var(--text-3);
  font-weight: 400;
}

/* ============================================================
   BUTTONS
   ============================================================ */
/* Primary */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  border-radius: var(--r-full);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s, transform .15s, box-shadow .2s;
  box-shadow: 0 4px 22px var(--accent-glow);
  position: relative;
  overflow: hidden;
  user-select: none;
}
.btn-primary::after {
  content: '';
  position: absolute; inset: 0;
  background: rgba(255,255,255,0);
  transition: background .2s;
}
.btn-primary:hover:not(:disabled)::after { background: rgba(255,255,255,.08); }
.btn-primary:hover:not(:disabled)        { box-shadow: 0 6px 30px var(--accent-glow); }
.btn-primary:active:not(:disabled)       { transform: scale(.97); }
.btn-primary:disabled                    { opacity: .35; cursor: not-allowed; }
.btn-primary.btn-lg  { padding: 16px 44px; font-size: 17px; }
.btn-primary.btn-sm  { padding: 8px  20px; font-size: 13px; }

/* Ghost */
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  background: rgba(255,255,255,.05);
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
  user-select: none;
}
.btn-ghost:hover          { background: rgba(255,255,255,.09); color: var(--text-1); border-color: var(--border-light); }
.btn-ghost.btn-lg         { padding: 14px 36px; font-size: 16px; }
.btn-ghost.btn-sm         { padding: 6px  14px; font-size: 13px; }

/* Back */
.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: none;
  color: var(--text-2);
  border: none;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: color .2s, background .2s;
}
.btn-back:hover { color: var(--text-1); background: rgba(255,255,255,.05); }

/* ============================================================
   INPUT VIEW
   ============================================================ */
.input-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  padding: 4px 28px 48px;
}

/* Tabs */
.tab-bar {
  display: flex;
  gap: 6px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 6px;
}
.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 16px;
  border: none;
  border-radius: var(--r-lg);
  background: none;
  color: var(--text-2);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background .25s, color .25s, box-shadow .25s;
}
.tab-btn.active {
  background: var(--bg-elevated);
  color: var(--text-1);
  box-shadow: var(--shadow-sm);
}

/* Tab panels */
.tab-panel         { display: none; flex-direction: column; gap: 12px; }
.tab-panel.active  { display: flex; }

/* Toolbar */
.sheet-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
/* Mode toggle buttons */
.mode-toggle-group {
  display: flex;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  padding: 3px;
}
.mode-toggle-btn {
  padding: 7px 18px;
  background: none;
  border: none;
  border-radius: var(--r-full);
  color: var(--text-2);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .25s ease;
  letter-spacing: .2px;
}
.mode-toggle-btn.active {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 2px 10px var(--accent-glow);
}
.mode-toggle-btn:not(.active):hover {
  color: var(--text-1);
  background: rgba(255,255,255,.05);
}

.sheet-actions { display: flex; gap: 8px; }

/* Hint */
.sheet-hint {
  padding: 10px 14px;
  background: rgba(124,111,247,.07);
  border: 1px solid rgba(124,111,247,.2);
  border-radius: var(--r-md);
  font-size: 13px;
  color: var(--accent-light);
  line-height: 1.5;
}

/* Sheet table wrapper */
.sheet-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--bg-surface);
}

.sheet-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 460px;
}
.sheet-table th {
  padding: 10px 14px;
  text-align: left;
  color: var(--text-3);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .6px;
  text-transform: uppercase;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.sheet-table td {
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  padding: 0;
  position: relative;
}
.sheet-table td:last-child { border-right: none; }
.sheet-table tr:last-child td { border-bottom: none; }

/* Editable cells */
.cell {
  display: block;
  width: 100%;
  padding: 10px 14px;
  min-height: 40px;
  outline: none;
  color: var(--text-1);
  font-family: 'Outfit', 'Noto Sans SC', sans-serif;
  font-size: 14px;
  caret-color: var(--accent);
  transition: background .15s;
}
.cell:focus { background: rgba(124,111,247,.07); }
.cell:empty::before {
  content: attr(data-placeholder);
  color: var(--text-3);
  pointer-events: none;
}

/* Row number column */
.col-num { width: 44px; text-align: center; }
.col-num .cell {
  text-align: center;
  cursor: default;
  color: var(--text-3);
  font-size: 12px;
  background: var(--bg-card);
}

/* Delete row button */
.btn-del-row {
  display: none;
  position: absolute;
  top: 50%; right: 6px;
  transform: translateY(-50%);
  width: 20px; height: 20px;
  border: none;
  border-radius: 50%;
  background: var(--danger);
  color: #fff;
  font-size: 11px;
  line-height: 1;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity .2s;
  z-index: 2;
}
.sheet-table tr:hover .btn-del-row        { display: flex; opacity: .65; }
.sheet-table tr:hover .btn-del-row:hover  { opacity: 1; }

/* Upload */
.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 56px 32px;
  border: 2px dashed var(--border);
  border-radius: var(--r-xl);
  background: var(--bg-surface);
  text-align: center;
  transition: border-color .25s, background .25s;
  cursor: default;
}
.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(124,111,247,.07);
}
.upload-icon  { font-size: 52px; }
.upload-title { font-size: 16px; font-weight: 600; }
.upload-sub   { font-size: 13px; color: var(--text-3); }

.upload-preview {
  padding: 16px 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.preview-info   { display: flex; align-items: center; gap: 12px; }
.preview-icon   { font-size: 26px; }
.preview-name   { font-weight: 600; font-size: 15px; }
.preview-count  { font-size: 13px; color: var(--text-2); margin-top: 2px; }

/* Input footer (hidden — button moved to header) */
.input-footer { display: none; }
.word-count-label { font-size: 12px; color: var(--text-3); white-space: nowrap; }

/* ============================================================
   SETTINGS VIEW
   ============================================================ */
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 8px;
}
.view-title {
  font-size: 22px;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.settings-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 620px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 24px 48px;
}

.settings-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.settings-section-title {
  font-size: 15px;
  font-weight: 700;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.setting-label { font-size: 14px; font-weight: 600; }
.setting-desc  { font-size: 12px; color: var(--text-2); margin-top: 3px; }

/* Toggle */
.toggle {
  position: relative;
  display: inline-block;
  width: 50px; height: 28px;
  flex-shrink: 0;
  cursor: pointer;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  transition: all .3s;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  left: 3px; top: 50%;
  transform: translateY(-50%);
  width: 20px; height: 20px;
  background: var(--text-3);
  border-radius: 50%;
  transition: all .3s;
}
.toggle input:checked + .toggle-slider               { background: var(--accent); border-color: var(--accent); }
.toggle input:checked + .toggle-slider::before       { left: calc(100% - 23px); background: #fff; }

/* Speed buttons */
.speed-btns { display: flex; gap: 6px; }
.speed-btn {
  padding: 6px 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  color: var(--text-2);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
}
.speed-btn.active,
.speed-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* Radio */
.card-count-options {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.radio-option {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-2);
}
.radio-option input[type="radio"] { accent-color: var(--accent); width: 16px; height: 16px; }
.count-input {
  width: 72px; padding: 6px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text-1);
  font-family: inherit;
  font-size: 14px;
}
.count-input:focus { outline: none; border-color: var(--accent); }

.settings-footer { display: flex; justify-content: center; padding-top: 8px; }

/* ============================================================
   TEST VIEW
   ============================================================ */
.test-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  position: sticky; top: 0; z-index: 20;
  background: rgba(7,7,15,.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.test-progress-info { display: flex; align-items: center; gap: 12px; }
#test-counter { font-size: 15px; font-weight: 600; color: var(--text-2); }

.wrong-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  background: rgba(248,113,113,.1);
  border: 1px solid rgba(248,113,113,.25);
  border-radius: var(--r-full);
  font-size: 13px;
  font-weight: 600;
  color: var(--danger);
}

/* Progress bar */
.progress-bar-wrap {
  height: 3px;
  background: var(--bg-surface);
  position: sticky; top: 57px; z-index: 19;
}
.progress-bar {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 0 2px 2px 0;
  transition: width .4s ease;
}

/* Test main */
.test-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px 24px 56px;
  gap: 28px;
  min-height: calc(100vh - 100px);
}

/* ── Flashcard ── */
.card-container {
  perspective: 1200px;
  width: 100%;
  max-width: 580px;
  height: 310px;
}
.card-inner {
  width: 100%; height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform .65s cubic-bezier(.4,.2,.2,1);
}
.card-inner.flipped { transform: rotateY(180deg); }

.card-face {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--r-xl);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 36px;
  overflow: hidden;
}

/* Card front */
.card-front {
  gap: 18px;
  background: linear-gradient(150deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(124,111,247,.08);
}
.card-front::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: var(--r-xl);
  background: radial-gradient(ellipse at 30% 25%, rgba(124,111,247,.09), transparent 60%);
  pointer-events: none;
}

.card-lang-badge {
  padding: 4px 14px;
  background: rgba(124,111,247,.14);
  border: 1px solid rgba(124,111,247,.28);
  border-radius: var(--r-full);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .3px;
  color: var(--accent-light);
}

.card-word {
  font-size: clamp(32px, 7vw, 58px);
  font-weight: 900;
  text-align: center;
  color: var(--text-1);
  letter-spacing: -1.5px;
  line-height: 1.15;
  font-family: 'Outfit', 'Noto Sans SC', sans-serif;
  word-break: break-word;
}

.tts-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  color: var(--text-2);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
}
.tts-btn:hover { background: rgba(255,255,255,.1); color: var(--text-1); border-color: var(--border-light); }
.tts-btn.playing {
  background: rgba(124,111,247,.15);
  border-color: var(--accent);
  color: var(--accent-light);
  animation: tts-pulse 1.1s ease-in-out infinite;
}
@keyframes tts-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: .65; }
}

/* Card front button row */
.card-front-btns {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

/* Pinyin hint (shown while peek button is held) */
.pinyin-hint {
  font-size: 18px;
  font-weight: 500;
  color: var(--accent-light);
  letter-spacing: 1px;
  min-height: 28px;          /* reserve space so card doesn't jump */
  text-align: center;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity .15s ease, transform .15s ease;
  pointer-events: none;
  font-family: 'Outfit', sans-serif;
}
.pinyin-hint.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Pinyin peek button */
.pinyin-peek-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: rgba(167,139,250,.1);
  border: 1px solid rgba(167,139,250,.28);
  border-radius: var(--r-full);
  color: var(--accent-light);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, border-color .15s;
  user-select: none;
  -webkit-user-select: none;
}
.pinyin-peek-btn:hover  { background: rgba(167,139,250,.18); }
.pinyin-peek-btn.peeking {
  background: rgba(167,139,250,.25);
  border-color: var(--accent-light);
}

/* Card back */
.card-back {
  transform: rotateY(180deg);
  background: linear-gradient(150deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  box-shadow: var(--shadow-lg);
  align-items: stretch;
  justify-content: flex-start;
  padding: 20px 28px;
  overflow-y: auto;
}

.card-back-inner {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.back-section { padding: 12px 0; }
.back-divider {
  height: 1px;
  background: var(--border);
  margin: 0 -4px;
}
.back-section-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 8px;
}

.answer-data {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.ans-word    { font-size: 20px; font-weight: 800; color: var(--accent-light); font-family: 'Outfit','Noto Sans SC',sans-serif; }
.ans-pinyin  { font-size: 14px; font-weight: 400; color: var(--text-2); }
.ans-meaning { font-size: 17px; font-weight: 600; color: var(--text-1); }

.user-answer-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--warning);
  min-height: 24px;
  line-height: 1.4;
}
.user-answer-text.empty { color: var(--text-3); font-style: italic; font-weight: 400; }

/* ── Answer input ── */
.answer-input-area {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 580px;
  flex-wrap: wrap;
}
.answer-input {
  flex: 1;
  min-width: 200px;
  padding: 14px 22px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  color: var(--text-1);
  font-family: inherit;
  font-size: 15px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.answer-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124,111,247,.15);
}
.answer-input::placeholder { color: var(--text-3); }

.btn-check {
  display: inline-flex;
  align-items: center;
  padding: 14px 28px;
  background: var(--accent-gradient);
  border: none;
  border-radius: var(--r-full);
  color: #fff;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 18px var(--accent-glow);
  transition: box-shadow .2s, transform .15s;
}
.btn-check:hover  { box-shadow: 0 6px 28px var(--accent-glow); transform: translateY(-1px); }
.btn-check:active { transform: scale(.97); }

/* ── Action area ── */
.action-area {
  display: flex;
  gap: 12px;
  width: 100%;
  max-width: 580px;
  flex-wrap: wrap;
}
.btn-wrong-note {
  flex: 1;
  min-width: 170px;
  padding: 14px 24px;
  background: rgba(248,113,113,.08);
  border: 1px solid rgba(248,113,113,.28);
  border-radius: var(--r-full);
  color: var(--danger);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: background .2s, border-color .2s;
}
.btn-wrong-note:hover:not(:disabled) { background: rgba(248,113,113,.16); border-color: var(--danger); }
.btn-wrong-note.added {
  background: rgba(52,211,153,.08);
  border-color: rgba(52,211,153,.28);
  color: var(--success);
  cursor: default;
}

.btn-next {
  flex: 1;
  min-width: 170px;
  padding: 14px 24px;
  background: var(--accent-gradient);
  border: none;
  border-radius: var(--r-full);
  color: #fff;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  box-shadow: 0 4px 18px var(--accent-glow);
  transition: box-shadow .2s, transform .15s;
}
.btn-next:hover  { box-shadow: 0 6px 28px var(--accent-glow); transform: translateY(-1px); }
.btn-next:active { transform: scale(.97); }

/* ============================================================
   RESULTS VIEW
   ============================================================ */
.results-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 28px;
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 24px 60px;
}

.results-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 20px 0 4px;
  text-align: center;
}
.results-title {
  font-size: 34px;
  font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
}

.results-stats { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 22px 40px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  min-width: 150px;
}
.stat-card.accent {
  border-color: rgba(248,113,113,.28);
  background: rgba(248,113,113,.05);
}
.stat-num  { font-size: 44px; font-weight: 900; color: var(--text-1); line-height: 1; }
.stat-card.accent .stat-num { color: var(--danger); }
.stat-label { font-size: 13px; color: var(--text-2); font-weight: 500; }

/* Wrong notes section */
.wrong-notes-section {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  overflow: hidden;
}
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  border-bottom: 1px solid var(--border);
}
.section-title { font-size: 16px; font-weight: 700; }

.btn-download {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: rgba(52,211,153,.09);
  border: 1px solid rgba(52,211,153,.28);
  border-radius: var(--r-full);
  color: var(--success);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
}
.btn-download:hover:not(:disabled) { background: rgba(52,211,153,.16); }
.btn-download:disabled { opacity: .35; cursor: not-allowed; }

.wrong-notes-table-wrap {
  overflow-x: auto;
  max-height: 380px;
  overflow-y: auto;
}

.no-wrong-notes {
  text-align: center;
  padding: 44px 24px;
  color: var(--text-2);
  font-size: 15px;
}

.wrong-notes-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.wrong-notes-table th {
  padding: 10px 18px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .6px;
  text-transform: uppercase;
  color: var(--text-3);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0;
}
.wrong-notes-table td {
  padding: 11px 18px;
  color: var(--text-1);
  border-bottom: 1px solid rgba(255,255,255,.04);
}
.wrong-notes-table tr:last-child td { border-bottom: none; }
.wrong-notes-table tr:hover td      { background: rgba(255,255,255,.025); }

/* Results footer */
.results-footer {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Results tab bar ── */
.results-tab-bar {
  display: flex;
  gap: 6px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 6px;
}
.results-tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 11px 16px;
  border: none;
  border-radius: var(--r-lg);
  background: none;
  color: var(--text-2);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .25s, color .25s, box-shadow .25s;
}
.results-tab-btn.active {
  background: var(--bg-elevated);
  color: var(--text-1);
  box-shadow: var(--shadow-sm);
}
.rtab-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  background: rgba(124,111,247,.15);
  border-radius: var(--r-full);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-light);
  transition: background .25s, color .25s;
}
.results-tab-btn.active .rtab-count {
  background: var(--accent);
  color: #fff;
}

/* ── User answer column in results tables ── */
.td-user-answer {
  color: var(--warning);
  font-weight: 500;
  font-size: 13px;
}
.td-user-answer.empty {
  color: var(--text-3);
  font-style: italic;
  font-weight: 400;
}

/* ── Inline "+ 오답노트" button in all-words table ── */
.td-action {
  width: 110px;
  text-align: center;
}
.btn-add-note {
  padding: 5px 13px;
  background: rgba(248,113,113,.08);
  border: 1px solid rgba(248,113,113,.25);
  border-radius: var(--r-full);
  color: var(--danger);
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background .2s, border-color .2s;
}
.btn-add-note:hover:not(:disabled) {
  background: rgba(248,113,113,.18);
  border-color: var(--danger);
}
.btn-add-note.added {
  background: rgba(52,211,153,.08);
  border-color: rgba(52,211,153,.25);
  color: var(--success);
  cursor: default;
}

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar         { width: 6px; height: 6px; }
::-webkit-scrollbar-track   { background: transparent; }
::-webkit-scrollbar-thumb   { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 640px) {
  .app-header  { padding: 22px 16px 14px; }
  .logo-text   { font-size: 24px; }
  .input-main  { padding: 4px 16px 40px; }
  .settings-header { padding: 14px 16px 8px; }
  .settings-main   { padding: 12px 16px 40px; }
  .test-main       { padding: 24px 16px 44px; gap: 20px; }
  .card-container  { height: 280px; }
  .card-word       { font-size: 28px; letter-spacing: -.5px; }
  .card-face       { padding: 20px 22px; }
  .answer-input-area { flex-direction: column; }
  .action-area       { flex-direction: column; }
  .results-main  { padding: 12px 16px 48px; }
  .stat-card     { padding: 18px 28px; min-width: 130px; }
  .stat-num      { font-size: 36px; }
  .section-header { flex-wrap: wrap; gap: 10px; }
}