/* Liquid Glass: полупрозрачные панели поверх цветного размытого фона */

:root {
  --text: #10131a;
  --muted: rgba(16, 19, 26, 0.58);
  --accent: #2f6bff;
  --accent-2: #5f7dff;
  --ok: #17a35a;
  --bad: #e5484d;
  --warn: #b7791f;

  --glass-bg: rgba(255, 255, 255, 0.42);
  --glass-bg-strong: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.75);
  --glass-edge: rgba(255, 255, 255, 0.9);
  --glass-shadow: 0 10px 40px rgba(31, 38, 80, 0.16), 0 2px 8px rgba(31, 38, 80, 0.08);
  --blur: blur(22px) saturate(180%);

  --page-bg: #eef1f8;
  --blob-1: #b9ccff;
  --blob-2: #dccbff;
  --blob-3: #bfeee3;
  --blob-4: #ffdcc4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f4f8;
    --muted: rgba(242, 244, 248, 0.6);
    --glass-bg: rgba(30, 34, 48, 0.42);
    --glass-bg-strong: rgba(40, 45, 62, 0.62);
    --glass-border: rgba(255, 255, 255, 0.14);
    --glass-edge: rgba(255, 255, 255, 0.28);
    --glass-shadow: 0 10px 40px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.3);
    --page-bg: #0b0d14;
    --blob-1: #1e2f66;
    --blob-2: #3a2766;
    --blob-3: #16473f;
    --blob-4: #4f3424;
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { min-height: 100%; background: var(--page-bg); }

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, system-ui, sans-serif;
  color: var(--text);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* Цветные пятна на фоне — их и «преломляет» стекло */
body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.55;
  pointer-events: none;
}

body::before {
  width: 60vmax;
  height: 60vmax;
  top: -20vmax;
  left: -15vmax;
  background:
    radial-gradient(circle at 30% 30%, var(--blob-1), transparent 70%),
    radial-gradient(circle at 75% 70%, var(--blob-2), transparent 70%);
  animation: drift-a 26s ease-in-out infinite alternate;
}

body::after {
  width: 55vmax;
  height: 55vmax;
  bottom: -20vmax;
  right: -15vmax;
  background:
    radial-gradient(circle at 35% 40%, var(--blob-3), transparent 70%),
    radial-gradient(circle at 70% 65%, var(--blob-4), transparent 70%);
  animation: drift-b 32s ease-in-out infinite alternate;
}

@keyframes drift-a { to { transform: translate(8vmax, 6vmax) scale(1.08); } }
@keyframes drift-b { to { transform: translate(-7vmax, -5vmax) scale(1.1); } }

@media (prefers-reduced-motion: reduce) {
  body::before, body::after { animation: none; }
}

/* Общий «стеклянный» материал */
.glass,
.tab,
.ghost,
input, textarea, select,
details,
.flashcard,
.item,
.paste-row,
.notice,
#login {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), inset 0 1px 0 var(--glass-edge), inset 0 -1px 0 rgba(255, 255, 255, 0.08);
}

.screen {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

#login {
  margin-top: 12vh;
  padding: 32px 24px;
  border-radius: 32px;
  text-align: center;
  max-width: 440px;
}

#login .primary { width: 100%; margin-top: 8px; }

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 8px 0 16px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Вкладки — как сегментированный контрол */
.tabs {
  display: flex;
  gap: 4px;
  margin: 8px 0 18px;
  padding: 5px;
  border-radius: 999px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), inset 0 1px 0 var(--glass-edge);
}

.tabs .tab {
  flex: 1;
  padding: 10px 6px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text);
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.tabs .tab.active {
  background: var(--glass-bg-strong);
  border-color: var(--glass-border);
  box-shadow: 0 4px 14px rgba(31, 38, 80, 0.15), inset 0 1px 0 var(--glass-edge);
  font-weight: 600;
}

/* Кнопки */
button {
  font: inherit;
  border-radius: 999px;
  padding: 11px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  color: var(--text);
  transition: transform 0.15s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

button:active:not(:disabled) { transform: scale(0.97); }
button:disabled { opacity: 0.45; cursor: default; }

.primary, .success, .danger {
  color: #fff;
  font-weight: 600;
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow: 0 6px 18px rgba(47, 107, 255, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.success {
  background: linear-gradient(135deg, #2fbf7a, #1fae63);
  box-shadow: 0 6px 18px rgba(23, 163, 90, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.45);
}
.danger {
  background: linear-gradient(135deg, #f26d70, #e85a5e);
  box-shadow: 0 6px 18px rgba(229, 72, 77, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.primary:hover:not(:disabled),
.success:hover:not(:disabled),
.danger:hover:not(:disabled) { filter: brightness(1.06); }

.ghost { color: var(--text); }
.ghost:hover:not(:disabled) { background: var(--glass-bg-strong); }
.ghost.danger {
  color: var(--bad);
  background: var(--glass-bg);
  box-shadow: var(--glass-shadow), inset 0 1px 0 var(--glass-edge);
}

.wide { width: 100%; }

.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin: 10px 0;
}

.answers > button { flex: 1; padding: 14px; }

/* Поля ввода */
input, textarea, select {
  width: 100%;
  font: inherit;
  padding: 12px 14px;
  border-radius: 16px;
  color: var(--text);
  margin: 6px 0 14px;
  outline: none;
  box-shadow: inset 0 1px 0 var(--glass-edge), 0 2px 8px rgba(31, 38, 80, 0.06);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input::placeholder, textarea::placeholder { color: var(--muted); }

input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(47, 107, 255, 0.18), inset 0 1px 0 var(--glass-edge);
}

select { appearance: none; -webkit-appearance: none; cursor: pointer; }

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
}

#add-form {
  padding: 18px;
  border-radius: 28px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), inset 0 1px 0 var(--glass-edge);
}

details {
  margin-top: 16px;
  border-radius: 24px;
  padding: 14px 18px;
}

summary { cursor: pointer; font-weight: 600; }
details[open] summary { margin-bottom: 10px; }

.file-label input[type="file"] {
  border: none;
  padding: 6px 0;
  background: none;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.stats { color: var(--muted); font-size: 0.95rem; }
.muted { color: var(--muted); }
.error { color: var(--bad); }
.warn { color: var(--warn); }

/* Уведомления */
.notice {
  padding: 12px 16px;
  border-radius: 18px;
  margin: 8px 0 14px;
  font-weight: 500;
}
.notice.ok { color: var(--ok); }
.notice.warn { color: var(--warn); }
.notice.error { color: var(--bad); }

/* Карточка */
.flashcard {
  position: relative;
  overflow: hidden;
  border-radius: 32px;
  padding: 36px 24px;
  margin: 14px 0 16px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--glass-bg-strong);
}

/* Блик в верхней части стекла */
.flashcard::before {
  content: "";
  position: absolute;
  inset: 0 0 55% 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0));
  pointer-events: none;
  border-radius: 32px 32px 0 0;
}

@media (prefers-color-scheme: dark) {
  .flashcard::before { background: linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0)); }
}

.front {
  position: relative;
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
}

.back {
  position: relative;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--glass-border);
  text-align: center;
  animation: reveal 0.3s ease;
}

@keyframes reveal { from { opacity: 0; transform: translateY(6px); } }

.phrase { font-size: 1.3rem; font-weight: 600; }
.transcription { color: var(--muted); margin: 4px 0; font-size: 1.05rem; }
.translation { margin: 8px 0; font-size: 1.15rem; }

blockquote {
  margin: 14px 0 6px;
  padding: 12px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.25);
  font-style: italic;
  color: var(--muted);
}

@media (prefers-color-scheme: dark) {
  blockquote { background: rgba(255, 255, 255, 0.06); }
}

.back .row { justify-content: center; }

/* Список */
.item {
  padding: 14px 16px;
  border-radius: 22px;
  margin: 10px 0;
}

.item .row { margin-bottom: 0; }

.paste-row {
  padding: 12px;
  border-radius: 20px;
  margin: 10px 0;
}

.paste-row input { margin: 6px 0; }
.paste-row.skip { opacity: 0.5; }

#search { margin-top: 0; }

/* Если браузер не поддерживает размытие — делаем панели плотнее */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  :root {
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-bg-strong: rgba(255, 255, 255, 0.92);
  }
}