/* ============================================
   Sõnastik — Taivo personal flashcards
   Scholarly / terminal-meets-study aesthetic
   ============================================ */

/* ---- Reset & base ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Warm dark palette */
  --bg: #13110e;
  --bg-elev: #1d1a15;
  --bg-elev-2: #252017;
  --border: #2f2921;
  --border-strong: #443c30;

  /* Text */
  --text: #e8e1d3;
  --text-muted: #8a8275;
  --text-dim: #5f5a4f;

  /* Accents */
  --amber: #e8a65d;
  --amber-dim: #a87538;
  --teal: #5ac8b0;
  --teal-dim: #3d8a78;
  --red: #d47569;
  --red-dim: #8a473f;

  /* Fonts */
  --f-display: 'Fraunces', Georgia, serif;
  --f-body: 'Literata', Georgia, serif;
  --f-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* Sizing */
  --max-w: 680px;
  --r: 4px;
  --r-lg: 8px;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background-image:
    radial-gradient(ellipse at top, rgba(232, 166, 93, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse at bottom, rgba(90, 200, 176, 0.02) 0%, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Paper grain overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9'/><feColorMatrix values='0 0 0 0 0.9  0 0 0 0 0.8  0 0 0 0 0.7  0 0 0 0.025 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
  opacity: 0.6;
  pointer-events: none;
  z-index: 1;
  mix-blend-mode: overlay;
}

/* ---- Layout ---- */
.app {
  position: relative;
  z-index: 2;
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

@media (min-width: 640px) {
  .app {
    padding: 56px 32px 80px;
  }
}

/* ---- Header ---- */
.header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.logo {
  font-family: var(--f-display);
  font-weight: 300;
  font-style: italic;
  font-size: 32px;
  letter-spacing: -0.02em;
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  transition: color 0.2s;
}

.logo:hover {
  color: var(--amber);
}

.logo-dot {
  color: var(--amber);
  font-style: normal;
}

.header-meta {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ---- View switcher ---- */
.view {
  display: none;
  animation: fadeIn 0.4s ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Home view ---- */
.hero {
  padding: 48px 0 64px;
  text-align: center;
}

.hero h1 {
  font-family: var(--f-display);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(48px, 10vw, 88px);
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--text);
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: normal;
  color: var(--amber);
}

.hero-sub {
  font-family: var(--f-body);
  font-style: italic;
  font-size: 18px;
  color: var(--text-muted);
  max-width: 420px;
  margin: 0 auto 48px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 40px;
}

.stat {
  background: var(--bg-elev);
  padding: 24px 12px;
  text-align: center;
}

.stat-num {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: 42px;
  line-height: 1;
  color: var(--text);
  letter-spacing: -0.03em;
}

.stat-num.amber { color: var(--amber); }
.stat-num.teal { color: var(--teal); }

.stat-label {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 6px;
}

.actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn {
  font-family: var(--f-body);
  font-size: 17px;
  padding: 16px 24px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  border-radius: var(--r);
  transition: all 0.2s;
  text-align: center;
  text-decoration: none;
  display: block;
}

.btn:hover {
  border-color: var(--amber-dim);
  color: var(--amber);
  background: rgba(232, 166, 93, 0.05);
}

.btn:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--amber);
  color: var(--bg);
  border-color: var(--amber);
  font-weight: 500;
}

.btn-primary:hover {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

.btn-primary:disabled {
  background: var(--bg-elev-2);
  color: var(--text-dim);
  border-color: var(--border);
  cursor: not-allowed;
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text-muted);
}

/* Kategooriad ribbon */
.cat-summary {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.cat-summary h3 {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.cat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px dotted var(--border);
  font-family: var(--f-body);
}

.cat-row:last-child {
  border-bottom: none;
}

.cat-row-name {
  color: var(--text);
}

.cat-row-count {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--text-muted);
}

/* ---- Flashcard view ---- */
.study-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.progress-bar {
  height: 2px;
  background: var(--border);
  margin-bottom: 40px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--amber);
  transition: width 0.3s ease;
}

.card-container {
  perspective: 1800px;
  margin-bottom: 32px;
}

.card {
  position: relative;
  min-height: 380px;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
  cursor: pointer;
}

.card.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.card-face-front {
  justify-content: center;
  align-items: center;
  text-align: center;
}

.card-face-back {
  transform: rotateY(180deg);
  justify-content: flex-start;
  text-align: left;
}

.card-cat {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 28px;
}

.card-term {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(36px, 8vw, 56px);
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 32px;
}

.card-hint {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
}

/* Back face content */
.back-cat {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.back-term {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: 28px;
  letter-spacing: -0.02em;
  color: var(--amber);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.back-short {
  font-family: var(--f-body);
  font-size: 18px;
  line-height: 1.5;
  color: var(--text);
  margin-bottom: 18px;
  font-style: italic;
}

.back-long {
  font-family: var(--f-body);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.back-example {
  font-family: var(--f-body);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-muted);
  border-left: 2px solid var(--amber);
  padding: 4px 0 4px 16px;
  margin-bottom: 20px;
  background: rgba(232, 166, 93, 0.03);
}

.back-example::before {
  content: 'NÄIDE';
  display: block;
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--amber-dim);
  margin-bottom: 4px;
}

.back-related {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.back-related-label {
  width: 100%;
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.chip {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--teal);
  border: 1px solid var(--teal-dim);
  padding: 3px 8px;
  border-radius: 2px;
  background: rgba(90, 200, 176, 0.04);
}

/* Answer buttons */
.answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn-answer {
  padding: 18px;
  font-family: var(--f-body);
  font-size: 16px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  border-radius: var(--r);
  transition: all 0.15s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.btn-answer .key {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

.btn-answer.btn-again {
  border-color: var(--red-dim);
}

.btn-answer.btn-again:hover {
  background: rgba(212, 117, 105, 0.08);
  border-color: var(--red);
  color: var(--red);
}

.btn-answer.btn-got {
  border-color: var(--teal-dim);
}

.btn-answer.btn-got:hover {
  background: rgba(90, 200, 176, 0.08);
  border-color: var(--teal);
  color: var(--teal);
}

.btn-answer:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ---- Search view ---- */
.search-input-wrap {
  position: relative;
  margin-bottom: 32px;
}

.search-input {
  width: 100%;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-family: var(--f-body);
  font-size: 18px;
  padding: 16px 20px 16px 48px;
  border-radius: var(--r);
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--amber);
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
  font-family: var(--f-mono);
}

.term-list {
  display: flex;
  flex-direction: column;
}

.term-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
}

.term-item:hover {
  padding-left: 12px;
}

.term-item-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 6px;
  gap: 12px;
}

.term-item-name {
  font-family: var(--f-display);
  font-size: 22px;
  font-weight: 400;
  color: var(--text);
  letter-spacing: -0.01em;
}

.term-item-meta {
  display: flex;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  flex-shrink: 0;
}

.term-item-meta .box {
  color: var(--amber);
}

.term-item-meta .box.new {
  color: var(--teal);
}

.term-item-short {
  font-family: var(--f-body);
  font-size: 15px;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.5;
}

.empty-state {
  padding: 64px 20px;
  text-align: center;
  color: var(--text-dim);
  font-family: var(--f-body);
  font-style: italic;
}

/* ---- Toast ---- */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-elev-2);
  border: 1px solid var(--amber);
  color: var(--text);
  padding: 12px 20px;
  border-radius: var(--r);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  opacity: 0;
  transition: all 0.3s;
  z-index: 100;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ---- Back button ---- */
.back-btn {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: none;
  border: none;
  padding: 8px 0;
  margin-bottom: 24px;
  cursor: pointer;
  transition: color 0.2s;
}

.back-btn:hover {
  color: var(--amber);
}

/* ---- Completion screen ---- */
.complete {
  text-align: center;
  padding: 64px 20px;
}

.complete h2 {
  font-family: var(--f-display);
  font-style: italic;
  font-weight: 300;
  font-size: 48px;
  color: var(--amber);
  margin-bottom: 16px;
}

.complete p {
  color: var(--text-muted);
  margin-bottom: 40px;
  font-style: italic;
}

/* ---- Footer ---- */
.footer {
  margin-top: auto;
  padding-top: 48px;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-align: center;
}

.footer a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px dotted var(--text-dim);
}

.footer a:hover {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---- Loading ---- */
.loading {
  text-align: center;
  padding: 64px;
  color: var(--text-dim);
  font-family: var(--f-body);
  font-style: italic;
}