:root {
  --bg: #05070d;
  --bg-soft: #0c101a;
  --panel: #101624;
  --panel-soft: #172135;
  --line: #28354d;
  --line-soft: #1e2a3f;
  --text: #f4f8ff;
  --muted: #9fb0cd;
  --success: #3dd598;
  --error: #ff6b6b;
  --shadow: 0 20px 45px rgba(3, 7, 16, 0.48);
  --accent-a: #00a8ff;
  --accent-b: #7a5cff;
  --accent-c: #22d3ee;
  --accent-a-soft: rgba(0, 168, 255, 0.2);
  --accent-b-soft: rgba(122, 92, 255, 0.16);
  --accent-border: rgba(122, 92, 255, 0.45);
  --accent-bg-soft: rgba(0, 168, 255, 0.14);
  --hero-border: rgba(0, 168, 255, 0.34);
  --hero-grad-a: rgba(0, 168, 255, 0.2);
  --hero-grad-b: rgba(122, 92, 255, 0.12);
  --focus-ring: rgba(122, 92, 255, 0.2);
  --button-shadow: rgba(122, 92, 255, 0.28);
}

body[data-source="instagram"] {
  --accent-a: #ff7a45;
  --accent-b: #ff2d7c;
  --accent-c: #f7b733;
  --accent-a-soft: rgba(255, 122, 69, 0.2);
  --accent-b-soft: rgba(255, 45, 124, 0.16);
  --accent-border: rgba(255, 45, 124, 0.45);
  --accent-bg-soft: rgba(255, 122, 69, 0.16);
  --hero-border: rgba(255, 122, 69, 0.34);
  --hero-grad-a: rgba(255, 122, 69, 0.2);
  --hero-grad-b: rgba(255, 45, 124, 0.12);
  --focus-ring: rgba(255, 45, 124, 0.2);
  --button-shadow: rgba(255, 45, 124, 0.3);
}

body[data-source="youtube"] {
  --accent-a: #ff244d;
  --accent-b: #ff5151;
  --accent-c: #ff8b2c;
  --accent-a-soft: rgba(255, 36, 77, 0.2);
  --accent-b-soft: rgba(255, 81, 81, 0.16);
  --accent-border: rgba(255, 81, 81, 0.45);
  --accent-bg-soft: rgba(255, 36, 77, 0.16);
  --hero-border: rgba(255, 36, 77, 0.34);
  --hero-grad-a: rgba(255, 36, 77, 0.2);
  --hero-grad-b: rgba(255, 139, 44, 0.12);
  --focus-ring: rgba(255, 81, 81, 0.2);
  --button-shadow: rgba(255, 81, 81, 0.32);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 5% 0%, var(--accent-a-soft), transparent 36%),
    radial-gradient(circle at 100% 100%, var(--accent-b-soft), transparent 32%),
    radial-gradient(circle at 50% 40%, rgba(68, 122, 255, 0.07), transparent 52%),
    linear-gradient(180deg, var(--bg-soft), var(--bg));
  overflow-x: hidden;
  transition: background 260ms ease;
}

.bg-shape {
  position: fixed;
  z-index: -1;
  border-radius: 999px;
  filter: blur(64px);
  pointer-events: none;
  opacity: 0.45;
}

.shape-a {
  width: 300px;
  height: 300px;
  left: -140px;
  top: 110px;
  background: var(--accent-a-soft);
}

.shape-b {
  width: 280px;
  height: 280px;
  right: -130px;
  bottom: 65px;
  background: var(--accent-b-soft);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  width: min(1040px, calc(100% - 1rem));
  margin: env(safe-area-inset-top) auto 0;
  padding: 0.84rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(10, 15, 25, 0.88);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  box-shadow: 0 12px 35px rgba(1, 5, 12, 0.32);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.brand-dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b), var(--accent-c));
}

.brand-name {
  font-family: "Sora", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.top-note {
  margin: 0;
  border-radius: 999px;
  border: 1px solid var(--accent-border);
  background: var(--accent-bg-soft);
  padding: 0.38rem 0.72rem;
  font-size: 0.8rem;
  color: #e8f2ff;
  white-space: nowrap;
}

.page {
  width: min(1040px, calc(100% - 1rem));
  margin: 0.8rem auto 1.5rem;
  display: grid;
  gap: 0.9rem;
  padding-bottom: calc(1.5rem + env(safe-area-inset-bottom));
}

.hero {
  border: 1px solid var(--hero-border);
  border-radius: 22px;
  padding: 1.08rem;
  background:
    linear-gradient(
      145deg,
      var(--hero-grad-a),
      var(--hero-grad-b) 58%,
      #0f1727
    );
  box-shadow: var(--shadow);
  animation: rise 320ms ease-out;
}

.hero-chip {
  margin: 0;
  display: inline-flex;
  border-radius: 999px;
  border: 1px solid var(--accent-border);
  padding: 0.3rem 0.7rem;
  font-size: 0.78rem;
  color: #f2f6ff;
  background: rgba(255, 255, 255, 0.06);
}

.hero h1 {
  margin: 0.72rem 0 0;
  font-family: "Sora", sans-serif;
  font-size: clamp(1.32rem, 5.5vw, 2.35rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0.62rem 0 0;
  color: var(--muted);
  max-width: 74ch;
  line-height: 1.48;
}

.panel,
.info-card,
.download-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 0.94rem;
  background: linear-gradient(160deg, rgba(18, 25, 39, 0.96), rgba(14, 20, 33, 0.96));
  box-shadow: var(--shadow);
}

.video-form {
  display: grid;
  gap: 0.62rem;
}

.video-form label {
  color: var(--muted);
}

.url-row {
  display: grid;
  gap: 0.56rem;
}

.url-input-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.56rem;
}

input,
select,
button {
  font-family: inherit;
  border-radius: 14px;
  border: 1px solid var(--line);
}

input,
select {
  width: 100%;
  min-height: 51px;
  font-size: 1rem;
  color: var(--text);
  background: var(--panel-soft);
  padding: 0.82rem 0.9rem;
  transition: border-color 170ms ease, box-shadow 170ms ease;
}

input::placeholder {
  color: #899dc2;
}

input:focus-visible,
select:focus-visible {
  outline: none;
  border-color: var(--accent-border);
  box-shadow: 0 0 0 4px var(--focus-ring);
}

button {
  min-height: 51px;
  font-weight: 700;
  font-size: 0.97rem;
  color: #ffffff;
  cursor: pointer;
  transition: transform 140ms ease, filter 140ms ease, box-shadow 140ms ease;
}

#analyze-btn,
#download-btn {
  background: linear-gradient(138deg, var(--accent-a), var(--accent-b), var(--accent-c));
  border-color: var(--accent-border);
  box-shadow: 0 12px 24px var(--button-shadow);
}

#analyze-btn:hover,
#download-btn:hover {
  filter: brightness(1.04);
}

.paste-btn {
  min-width: 86px;
  color: var(--text);
  background: #1a263b;
  box-shadow: none;
}

.paste-btn:hover {
  background: #233451;
}

button:active {
  transform: scale(0.99);
}

button:disabled {
  cursor: not-allowed;
  box-shadow: none;
  filter: saturate(0.45);
}

.quick-tip {
  margin: 0.22rem 0 0;
  font-size: 0.86rem;
  color: #b6d2ff;
}

.legal-note {
  margin: 0.08rem 0 0;
  font-size: 0.83rem;
  color: var(--muted);
}

.analyze-status {
  margin-top: 0.25rem;
}

.result {
  display: grid;
  gap: 0.86rem;
  animation: fadeIn 300ms ease-out;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.65rem;
}

h2 {
  margin: 0;
  font-size: 1.08rem;
}

.source-badge {
  border-radius: 999px;
  padding: 0.32rem 0.65rem;
  border: 1px solid var(--line-soft);
  background: #172335;
  color: #e4eeff;
  font-size: 0.8rem;
}

.source-badge[data-source="instagram"] {
  border-color: rgba(255, 66, 138, 0.45);
  background: rgba(255, 66, 138, 0.13);
}

.source-badge[data-source="youtube"] {
  border-color: rgba(255, 73, 73, 0.45);
  background: rgba(255, 73, 73, 0.13);
}

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

#video-title {
  margin: 0.86rem 0 0.34rem;
  font-size: 1.04rem;
  line-height: 1.38;
}

#video-channel,
#video-duration {
  margin: 0.2rem 0;
  color: var(--muted);
}

.download-card {
  display: grid;
  gap: 0.5rem;
}

.download-card label {
  color: var(--muted);
}

.field-group {
  display: grid;
  gap: 0.35rem;
}

.mp3-fixed-note {
  margin: 0.05rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.progress-wrap {
  margin-top: 0.26rem;
  display: grid;
  gap: 0.35rem;
}

.progress-track {
  width: 100%;
  height: 11px;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #0d1625;
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-a), var(--accent-b), var(--accent-c));
  transition: width 260ms ease;
}

.progress-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

#download-btn {
  margin-top: 0.28rem;
}

.status {
  margin: 0.2rem 0 0;
  min-height: 1.2rem;
  color: var(--muted);
  font-size: 0.93rem;
}

.status.ok {
  color: var(--success);
}

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

.hidden {
  display: none !important;
}

@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .page {
    width: calc(100% - 0.8rem);
  }

  .hero {
    padding: 0.95rem;
  }

  .panel,
  .info-card,
  .download-card {
    border-radius: 16px;
    padding: 0.85rem;
  }

  .url-input-wrap {
    grid-template-columns: 1fr;
  }

  .paste-btn {
    width: 100%;
  }
}

@media (min-width: 780px) {
  .topbar,
  .page {
    width: min(1040px, calc(100% - 1.8rem));
  }

  .url-row {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  #analyze-btn {
    min-width: 158px;
  }

  .panel,
  .info-card,
  .download-card {
    padding: 1.12rem;
  }
}

@media (min-width: 980px) {
  .result {
    grid-template-columns: 1.08fr 0.92fr;
  }
}

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

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