/* =========================================================
   Видео-конвертер — тёмная тема, минимализм, адаптив
   ========================================================= */

/* --- Переменные темы --- */
:root {
  --bg:         #0d1017;
  --bg-elev:    #161b25;
  --bg-elev-2:  #1e2532;
  --border:     #2a3242;
  --text:       #e7ecf3;
  --text-dim:   #9aa7ba;
  --accent:     #4f8cff;
  --accent-2:   #6aa8ff;
  --success:    #35c988;
  --danger:     #ff5c6c;
  --warning:    #ffb84d;
  --radius:     14px;
  --radius-sm:  9px;
  --shadow:     0 10px 30px rgba(0, 0, 0, 0.35);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

/* --- Базовый сброс --- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  /* мягкий градиентный фон */
  background:
    radial-gradient(1200px 600px at 50% -200px, rgba(79, 140, 255, 0.12), transparent 60%),
    var(--bg);
  min-height: 100vh;
  padding: clamp(16px, 4vw, 48px) 16px;
}

a { color: var(--accent-2); }

.app {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* --- Шапка --- */
.header { text-align: center; margin-bottom: 6px; }
.header__title { font-size: clamp(1.6rem, 5vw, 2.2rem); font-weight: 700; letter-spacing: -0.02em; }
.header__subtitle { color: var(--text-dim); margin-top: 6px; }
.privacy {
  margin-top: 12px;
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-dim);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 999px;
}

/* --- Карточки --- */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(16px, 3vw, 24px);
  box-shadow: var(--shadow);
}
.card__title { font-size: 1.05rem; font-weight: 600; margin-bottom: 14px; }
.card--result { border-color: rgba(53, 201, 136, 0.4); }

/* --- Зона перетаскивания --- */
.dropzone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: clamp(28px, 6vw, 56px) 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.05s;
}
.dropzone:hover { border-color: var(--accent); }
.dropzone:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.dropzone.is-dragover {
  border-color: var(--accent);
  background: rgba(79, 140, 255, 0.08);
  transform: scale(1.005);
}
.dropzone__inner { display: flex; flex-direction: column; align-items: center; gap: 8px; pointer-events: none; }
.dropzone__inner .btn { pointer-events: auto; }
.dropzone__icon { font-size: 2.4rem; }
.dropzone__text { font-size: 1.1rem; font-weight: 600; }
.dropzone__or { color: var(--text-dim); font-size: 0.85rem; }
.dropzone__hint { color: var(--text-dim); font-size: 0.78rem; margin-top: 8px; letter-spacing: 0.02em; }

/* --- Кнопки --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: inherit;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 11px 20px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s, transform 0.05s;
  color: var(--text);
  background: var(--bg-elev-2);
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover:not(:disabled) { background: var(--accent-2); }
.btn--secondary { background: var(--bg-elev-2); border-color: var(--border); }
.btn--secondary:hover:not(:disabled) { border-color: var(--accent); }
.btn--danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn--danger:hover:not(:disabled) { background: rgba(255, 92, 108, 0.12); }
.btn--ghost { background: transparent; border-color: var(--border); color: var(--text-dim); }
.btn--ghost:hover:not(:disabled) { color: var(--text); border-color: var(--text-dim); }

/* --- Баннер (статус/ошибки) --- */
.banner {
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  background: var(--bg-elev);
}
.banner--info    { border-color: rgba(79, 140, 255, 0.5); background: rgba(79, 140, 255, 0.1); }
.banner--success { border-color: rgba(53, 201, 136, 0.5); background: rgba(53, 201, 136, 0.1); }
.banner--warning { border-color: rgba(255, 184, 77, 0.5); background: rgba(255, 184, 77, 0.1); color: #ffd99a; }
.banner--error   { border-color: rgba(255, 92, 108, 0.5); background: rgba(255, 92, 108, 0.1); color: #ffb3ba; }

/* --- Сетка информации --- */
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 20px; }
.info-grid__item dt { font-size: 0.72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em; }
.info-grid__item dd { font-size: 0.95rem; word-break: break-word; margin-top: 2px; }

/* --- Поля формы --- */
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 0.9rem; margin-bottom: 8px; }
.field__note { color: var(--text-dim); font-weight: 400; font-size: 0.82rem; }

.select {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239aa7ba' stroke-width='2'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 38px;
}
.select:focus { outline: none; border-color: var(--accent); }

/* Ползунок CRF */
.range { width: 100%; accent-color: var(--accent); cursor: pointer; }
.range__scale { display: flex; justify-content: space-between; color: var(--text-dim); font-size: 0.72rem; margin-top: 4px; }

/* Плашка режима (copy / transcode) */
.mode-hint {
  font-size: 0.85rem;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  border: 1px solid var(--border);
  background: var(--bg-elev-2);
  color: var(--text-dim);
}
.mode-hint--copy { border-color: rgba(53, 201, 136, 0.4); color: #9be8c4; }
.mode-hint--transcode { border-color: rgba(255, 184, 77, 0.35); color: #ffd99a; }

.quality-fields.is-disabled { opacity: 0.45; pointer-events: none; }

/* --- Действия --- */
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.actions .btn { flex: 1 1 auto; }

/* --- Прогресс --- */
.progress {
  height: 12px;
  background: var(--bg-elev-2);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 0%;
  transition: width 0.2s ease;
}
.progress__meta { display: flex; justify-content: space-between; margin-top: 10px; font-size: 0.85rem; color: var(--text-dim); }
#progressPercent { font-weight: 700; color: var(--text); }

/* --- Лог --- */
.log { margin-top: 16px; }
.log summary { cursor: pointer; color: var(--text-dim); font-size: 0.85rem; user-select: none; }
.log summary:hover { color: var(--text); }
.log__output {
  margin-top: 10px;
  max-height: 220px;
  overflow: auto;
  background: #0a0d13;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.45;
  color: #b9c4d4;
  white-space: pre-wrap;
  word-break: break-word;
}

/* --- Результат --- */
#downloadLink { width: 100%; margin-top: 16px; }
#sizeDelta.is-smaller { color: var(--success); }
#sizeDelta.is-larger { color: var(--warning); }

/* --- Подвал --- */
.footer { text-align: center; color: var(--text-dim); font-size: 0.8rem; padding: 8px 0 4px; }

/* --- Адаптив --- */
@media (max-width: 480px) {
  .info-grid { grid-template-columns: 1fr; }
  .actions .btn { flex-basis: 100%; }
}