tts_site/frontend/style.css

:root {
  --bg: #0f1226;
  --bg2: #161a3a;
  --card: #1c2145;
  --card2: #232a58;
  --accent: #6c7bff;
  --accent2: #9a6cff;
  --text: #eef0ff;
  --muted: #9aa0c8;
  --ok: #35d0a5;
  --err: #ff6b7d;
  --radius: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Noto Sans KR", system-ui, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% -10%, #2a2f66 0%, transparent 60%),
              radial-gradient(1000px 500px at 100% 0%, #3a2566 0%, transparent 55%),
              var(--bg);
  min-height: 100vh;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

.hero { text-align: center; margin-bottom: 28px; }

.badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .2px;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 34px;
  margin: 0 0 8px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.subtitle { color: var(--muted); margin: 0 0 14px; font-size: 15px; }

.device-chip {
  display: inline-block;
  font-size: 12px;
  color: var(--muted);
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  padding: 5px 12px;
  border-radius: 999px;
}
.device-chip.gpu { color: var(--ok); border-color: rgba(53,208,165,.4); }

.card {
  background: linear-gradient(180deg, var(--card), var(--bg2));
  border: 1px solid rgba(255,255,255,.07);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}

.field-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 8px;
}

textarea {
  width: 100%;
  background: var(--card2);
  border: 1px solid rgba(255,255,255,.09);
  border-radius: 12px;
  color: var(--text);
  padding: 14px;
  font-size: 16px;
  font-family: inherit;
  resize: vertical;
  outline: none;
  transition: border-color .15s;
}
textarea:focus { border-color: var(--accent); }

.text-meta { text-align: right; color: var(--muted); font-size: 12px; margin: 6px 2px 0; }

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 18px;
}
@media (max-width: 520px) { .controls { grid-template-columns: 1fr; } }

select {
  width: 100%;
  background: var(--card2);
  border: 1px solid rgba(255,255,255,.09);
  border-radius: 12px;
  color: var(--text);
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  cursor: pointer;
}
select:focus { border-color: var(--accent); }

.sliders { margin-top: 20px; display: grid; gap: 18px; }
.slider-head {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 14px; margin-bottom: 8px;
}
.slider-val {
  font-weight: 700;
  color: var(--accent);
  background: rgba(108,123,255,.12);
  padding: 3px 10px; border-radius: 8px; font-size: 13px;
}
input[type="range"] {
  width: 100%;
  -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff; border: 3px solid var(--accent);
  cursor: pointer; box-shadow: 0 2px 8px rgba(0,0,0,.4);
}
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff; border: 3px solid var(--accent); cursor: pointer;
}
.slider-scale {
  display: flex; justify-content: space-between;
  color: var(--muted); font-size: 11px; margin-top: 6px;
}

.btn-primary {
  width: 100%; margin-top: 24px;
  padding: 16px;
  border: none; border-radius: 12px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff; font-size: 17px; font-weight: 700; font-family: inherit;
  cursor: pointer; transition: transform .08s, opacity .15s;
  display: flex; align-items: center; justify-content: center; gap: 10px;
}
.btn-primary:hover { opacity: .93; }
.btn-primary:active { transform: scale(.99); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; }

.spinner {
  width: 18px; height: 18px;
  border: 3px solid rgba(255,255,255,.35);
  border-top-color: #fff; border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result {
  margin-top: 22px;
  display: flex; flex-direction: column; gap: 12px; align-items: stretch;
}
audio { width: 100%; }

.btn-secondary {
  text-align: center;
  padding: 12px;
  border-radius: 12px;
  background: var(--card2);
  border: 1px solid rgba(255,255,255,.12);
  color: var(--text); text-decoration: none; font-weight: 500; font-size: 14px;
}
.btn-secondary:hover { border-color: var(--accent); }

.error {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(255,107,125,.12);
  border: 1px solid rgba(255,107,125,.4);
  color: var(--err); font-size: 14px;
}

.foot { text-align: center; color: var(--muted); font-size: 12px; margin-top: 26px; }