:root {
  --bg: #0f172a;         /* base background */
  --card: #111936;       /* card bg */
  --muted: #94a3b8;      /* muted text */
  --text: #e2e8f0;       /* main text */
  --brand: #60a5fa;      /* blue */
  --brand-2: #a78bfa;    /* violet */
  --accent: #22d3ee;     /* cyan */
  --radius: 18px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Cantarell, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100dvh;
  line-height: 1.6;
  position: relative;
}

/* fixed full-page gradient overlay so background doesn't cut off when scrolling */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(96,165,250,.15), transparent 60%),
    radial-gradient(900px 500px at 120% 0%, rgba(167,139,250,.15), transparent 60%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

/* Layout */
.container { width: min(100%, 980px); margin: 0 auto; padding: 24px; }

/* Header */
.site-header { background: transparent; padding: 1.5rem 0 0.5rem; border-bottom: 1px solid rgba(148,163,184,.15); }
.header-inner { display:flex; align-items:center; justify-content:space-between; gap:12px; }
.brand { display:flex; flex-direction:column; gap:6px; }
.logo {
  font-weight: 800; letter-spacing: .06em;
  font-size: clamp(24px, 4vw, 36px);
  background: linear-gradient(90deg, var(--brand), var(--brand-2), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.tag { color: var(--muted); font-size: 14px; }

/* Buttons */
.btn {
  appearance: none;
  border: 1px solid rgba(148,163,184,.25);
  background: rgba(17,25,54,.6);
  color: #e2e8f0;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}
.btn:hover { filter: brightness(1.08); }
.btn-primary { background: linear-gradient(90deg, #60a5fa, #22d3ee); border: none; color: #0b1224; }

/* Cards */
.card {
  background: var(--card);
  border: 1px solid rgba(148,163,184,.15);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(16px, 2.4vw, 24px);
  margin: 24px 0;
}
.card-head { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom: 12px; }
.card h2 { margin:0 0 8px; font-size: clamp(18px, 3vw, 22px); font-weight: 700; letter-spacing: .01em; }
.meta { color: var(--muted); font-size: 14px; }

/* Audio */
.audio-card h2 { text-align:center; color: var(--brand); }
.audio-card audio { width:100%; height:40px; margin-top: 1rem; border-radius:10px; outline:none; background:#0a1530; }
.audio-card .hint { margin-top:.5rem; text-align:center; color: var(--muted); font-size: 14px; }

/* Summaries */
.summaries-card h2 { text-align:center; color: var(--brand-2); }
.summaries { white-space: pre-wrap; line-height: 1.7; font-size: clamp(15px, 1.9vw, 16px); color: #e6edf7; }

/* Footer */
.site-footer { border-top: 1px solid rgba(148,163,184,.15); background: transparent; margin-top: 24px; text-align:center; padding: 1rem; }
.site-footer p { color: var(--muted); font-size: 14px; }

/* Modal */
.modal { position: fixed; inset: 0; display: none; }
.modal.open { display: block; }
.modal-backdrop { position:absolute; inset:0; background: rgba(0,0,0,.5); backdrop-filter: blur(2px); }
.modal-dialog {
  position: absolute;
  top: 50%;                /* center vertically */
  left: 50%;               /* center horizontally */
  transform: translate(-50%, -50%);
  max-width: 520px;
  width: calc(100% - 32px);
  background: var(--card);
  color: var(--text);
  border: 1px solid rgba(148,163,184,.2);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 20px;
}
.modal-title { margin: 0 0 8px; font-size: 1.25rem; }
.modal-help { color: var(--muted); margin: 0 0 12px; font-size: .95rem; }
.date-input {
  width: 100%; padding: 10px 12px; border-radius: 10px;
  border: 1px solid rgba(148,163,184,.25); background: #0a1530; color: #e2e8f0;
  margin-bottom: 14px;
}
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; }

/* Small screens */
@media (max-width: 520px) {
  .container { padding: 20px; }
  .card { margin: 16px 0; }
}