:root {
  --bg-1: #0f172a;
  --bg-2: #1e293b;
  --accent: #6366f1;
  --accent-2: #22d3ee;
  --accent-grad: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
  --card: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.12);
  --text: #e2e8f0;
  --muted: #94a3b8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Assistant", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 15% -10%, #312e81 0%, transparent 55%),
              radial-gradient(1000px 500px at 110% 10%, #0e7490 0%, transparent 50%),
              linear-gradient(160deg, var(--bg-1), var(--bg-2));
  background-attachment: fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.glass {
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 22px;
  padding: 40px 38px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  animation: rise 0.6s ease both;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.logo {
  width: 64px; height: 64px;
  margin: 0 auto 18px;
  border-radius: 18px;
  display: grid; place-items: center;
  background: var(--accent-grad);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.5);
}
.logo svg { width: 34px; height: 34px; fill: #fff; }

h1 {
  text-align: center;
  font-size: 1.7rem;
  margin: 0 0 6px;
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  text-align: center;
  color: var(--muted);
  margin-bottom: 28px;
  font-size: 0.95rem;
}

label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 0.9rem; }

.input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  font-size: 1rem;
  transition: border 0.2s, box-shadow 0.2s;
  margin-bottom: 18px;
}
.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.25);
}

.format-toggle {
  display: flex; gap: 12px; margin-bottom: 22px;
}
.format-toggle label {
  flex: 1; margin: 0; cursor: pointer;
}
.format-toggle input { display: none; }
.format-toggle span {
  display: block; text-align: center; padding: 12px;
  border-radius: 12px; border: 1px solid var(--card-border);
  background: rgba(0,0,0,0.2); font-weight: 600; transition: all 0.2s;
}
.format-toggle input:checked + span {
  background: var(--accent-grad); color: #fff; border-color: transparent;
  box-shadow: 0 8px 22px rgba(99,102,241,0.4);
}

.btn {
  width: 100%;
  padding: 15px;
  border: none;
  border-radius: 12px;
  background: var(--accent-grad);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, filter 0.2s;
  box-shadow: 0 12px 30px rgba(99, 102, 241, 0.45);
}
.btn:hover { transform: translateY(-2px); filter: brightness(1.05); }
.btn:active { transform: translateY(0); }

.alert {
  padding: 12px 14px; border-radius: 12px; margin-bottom: 18px;
  font-size: 0.9rem; text-align: center;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #fecaca;
}

.footer {
  text-align: center; margin-top: 22px;
  color: var(--muted); font-size: 0.8rem;
}
.footer a { color: var(--accent-2); text-decoration: none; }

.spinner {
  display: none; margin: 18px auto 0; width: 34px; height: 34px;
  border: 4px solid rgba(255,255,255,0.15);
  border-top-color: var(--accent-2);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }