:root {
  --bg: #0b111b;
  --bg-2: #0f1726;
  --card: #121d2d;
  --ink: #e8effa;
  --muted: #99a9c3;
  --accent: #57a5ff;
  --accent-dark: #3f8fe8;
  --line: #27354b;
  --ok: #34d17c;
  --ok-dark: #26b86a;
  --danger: #ff6e72;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Malgun Gothic", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top right, #1a2942 0%, var(--bg) 45%, #080d16 100%);
  min-height: 100vh;
  padding: 22px;
}

.container {
  width: min(980px, 100%);
  margin: 0 auto;
  background: linear-gradient(180deg, var(--card) 0%, #0f1827 100%);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.42);
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(1.7rem, 2.8vw, 2.35rem);
}

.subtext {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.97rem;
}

.helper-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: #0f2238;
  margin-bottom: 16px;
}

.helper-card h2 {
  margin: 0 0 6px;
  font-size: 0.95rem;
}

.helper-status {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.9rem;
}

.helper-status.success {
  color: #5de8a1;
}

.helper-status.error {
  color: var(--danger);
}

.helper-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

form {
  display: grid;
  gap: 12px;
}

label {
  font-size: 0.92rem;
  font-weight: 650;
}

input[type="url"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 13px;
  font-size: 1rem;
  background: #0d1625;
  color: var(--ink);
}

input[type="url"]::placeholder {
  color: #7286a6;
}

.mode-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.mode-group label,
.agree {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 550;
  color: #c0cde2;
}

.agree {
  font-size: 0.9rem;
}

button {
  border: 0;
  border-radius: 12px;
  background: var(--accent);
  color: #f4f9ff;
  font-size: 1rem;
  font-weight: 650;
  padding: 12px 16px;
  cursor: pointer;
  transition: background 0.16s ease;
}

button:hover {
  background: var(--accent-dark);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}

.video-summary {
  margin-top: 20px;
  display: grid;
  grid-template-columns: minmax(170px, 320px) 1fr;
  gap: 16px;
  align-items: center;
}

.video-thumb {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  object-fit: cover;
  aspect-ratio: 16/9;
  background: #1d2a3d;
}

.video-meta h2 {
  margin: 0 0 8px;
  font-size: clamp(1.1rem, 2.1vw, 1.65rem);
  line-height: 1.25;
}

.video-meta p {
  margin: 0;
  color: #91c4ff;
  font-size: 1rem;
}

.options-panel {
  margin-top: 18px;
}

.options-panel h2 {
  margin: 0 0 8px;
  font-size: 1.25rem;
}

.options-hint {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.options-action-hint {
  margin: 0 0 10px;
  color: #9dcbff;
  font-size: 0.92rem;
  font-weight: 600;
}

.options-action-hint:empty {
  display: none;
}

.table-wrap {
  border: 1px solid var(--line);
  border-radius: 0;
  overflow: auto;
  background: #111a2a;
}

.options-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  min-width: 640px;
}

.options-table thead th {
  background: linear-gradient(180deg, #247fdf 0%, #1f70c7 100%);
  color: #eff6ff;
  text-align: center;
  padding: 18px 14px;
  font-size: 1rem;
  border-right: 2px solid #5f8fc5;
}

.options-table thead th:first-child {
  border-top-left-radius: 14px;
}

.options-table thead th:last-child {
  border-top-right-radius: 14px;
  border-right: 0;
}

.options-table tbody td {
  border-top: 1px solid #304666;
  border-right: 1px solid #304666;
  padding: 14px 12px;
  font-size: 1.02rem;
  vertical-align: middle;
  background: #0f1727;
}

.options-table tbody tr:nth-child(even) td {
  background: #0d1523;
}

.options-table tbody td:last-child {
  border-right: 0;
}

.options-table tbody tr.unavailable {
  opacity: 0.62;
}

.quality-cell {
  min-width: 240px;
}

.quality-main {
  display: flex;
  align-items: center;
  gap: 10px;
}

.quality-label {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.quality-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 22px;
  border-radius: 999px;
  background: #0a0f18;
  color: #ecf4ff;
  border: 1px solid #3d5e88;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 0 10px;
}

.size-cell {
  text-align: center;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.action-cell {
  text-align: center;
}

.option-subtext {
  display: block;
  color: var(--muted);
  font-size: 0.73rem;
  margin-top: 5px;
}

.source-tag {
  display: inline-block;
  border: 1px solid #466086;
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 0.77rem;
  color: #a5ccff;
  background: #15253d;
}

.row-download {
  min-width: 162px;
  background: var(--ok);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.25);
}

.row-download:hover {
  background: var(--ok-dark);
}

.progress-panel {
  margin-top: 18px;
}

.progress-text {
  margin: 0 0 8px;
  color: #ffd57a;
  font-size: 1.15rem;
  text-align: center;
}

.progress-track {
  position: relative;
  width: 100%;
  height: 22px;
  border-radius: 999px;
  background: #1a2740;
  overflow: hidden;
  border: 1px solid #314c73;
}

.progress-bar {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #2f8eef, #72bbff);
  transition: width 0.24s ease;
}

.progress-percent {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #ecf4ff;
}

.ready-panel {
  margin-top: 18px;
  display: grid;
  justify-items: center;
  gap: 8px;
}

.download-ready {
  min-width: 280px;
  border-radius: 999px;
  background: var(--ok);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  padding: 18px 26px;
  box-shadow: 0 10px 26px rgba(20, 110, 62, 0.38);
}

.download-ready:hover {
  background: var(--ok-dark);
}

.ready-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

.status {
  margin-top: 15px;
  min-height: 22px;
  color: var(--muted);
}

.status.success {
  color: #6ae6a8;
}

.status.error {
  color: var(--danger);
}

.result {
  margin-top: 8px;
}

.download-popup {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(3, 8, 15, 0.68);
  z-index: 9999;
}

.download-popup-card {
  width: min(460px, 100%);
  border-radius: 16px;
  border: 1px solid #385075;
  background: #131f31;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.52);
  padding: 16px;
}

.download-popup-text {
  margin: 0 0 10px;
  font-size: 0.98rem;
  font-weight: 650;
  color: #d4e7ff;
  text-align: center;
}

.download-popup-track {
  position: relative;
  width: 100%;
  height: 24px;
  border-radius: 999px;
  border: 1px solid #314b71;
  background: #1a2740;
  overflow: hidden;
}

.download-popup-bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #2f8eef, #72bbff);
  transition: width 0.16s ease;
}

.download-popup-percent {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.87rem;
  font-weight: 700;
  color: #ecf4ff;
}

.fallback-guide {
  border: 1px solid #61333c;
  background: #22171b;
  border-radius: 12px;
  padding: 12px;
  font-size: 0.86rem;
  color: #ffd8df;
}

.fallback-guide h3 {
  margin: 0 0 8px;
}

.fallback-guide code {
  color: #ffd2a2;
}

.fallback-guide ol {
  margin: 0 0 8px 18px;
  padding: 0;
}

@media (max-width: 740px) {
  body {
    padding: 10px;
  }

  .container {
    padding: 16px;
  }

  .video-summary {
    grid-template-columns: 1fr;
  }

  .download-ready {
    width: 100%;
    min-width: 0;
    font-size: 1.5rem;
  }
}