/* ==========================================================================
   DChavezMusic Lessons System — theme
   Palette: ink navy stage backdrop, brass accent, warm paper text.
   Signature motif: a five-line music staff used as a header/divider mark,
   and a numbered "setlist" treatment for the lesson listings.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,600&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --ink:        #12141c;
  --ink-raised: #1a1e29;
  --paper:      #eee7d8;
  --paper-dim:  #a9a596;
  --brass:      #c9973f;
  --brass-deep: #8f6a24;
  --brass-glow: rgba(201, 151, 63, 0.16);
  --rule:       rgba(238, 231, 216, 0.14);
  --danger:     #b5533f;
  --danger-glow: rgba(181, 83, 63, 0.16);
  --ok:         #6f9a6a;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --radius: 8px;
  --container: 880px;
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.55;
  min-height: 100vh;
}

a { color: var(--brass); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* -------------------------------------------------------------------- */
/* Staff-line header — the signature element                            */
/* -------------------------------------------------------------------- */
.staff-header {
  position: relative;
  padding: 56px 0 28px;
  margin-bottom: 36px;
}

.staff-lines {
  position: absolute;
  inset: 0;
  top: 18px;
  height: 46px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  z-index: 0;
  opacity: 0.9;
}
.staff-lines span {
  display: block;
  height: 1px;
  background: var(--rule);
}

.staff-header .eyebrow {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0 0 6px;
}

.staff-header h1 {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 4vw, 42px);
  margin: 0;
  background: var(--ink);
  display: inline-block;
  padding-right: 18px;
  letter-spacing: -0.01em;
}

.staff-header .sub {
  position: relative;
  z-index: 1;
  color: var(--paper-dim);
  margin-top: 10px;
  max-width: 60ch;
}

/* -------------------------------------------------------------------- */
/* Nav                                                                   */
/* -------------------------------------------------------------------- */
.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--rule);
}
.topnav .brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--paper);
}
.topnav .brand em {
  color: var(--brass);
  font-style: normal;
}
.topnav .links a {
  color: var(--paper-dim);
  margin-left: 22px;
  font-size: 14px;
}
.topnav .links a:hover { color: var(--brass); }

/* -------------------------------------------------------------------- */
/* Cards / forms                                                         */
/* -------------------------------------------------------------------- */
.card {
  background: var(--ink-raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
}

.card h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  margin: 0 0 18px;
}

form .field {
  margin-bottom: 16px;
}
label {
  display: block;
  font-size: 13px;
  color: var(--paper-dim);
  margin-bottom: 6px;
}
input[type="text"],
input[type="email"],
input[type="password"],
input[type="file"],
textarea {
  width: 100%;
  background: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 11px 12px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 14px;
}
input:focus, textarea:focus, button:focus, a.btn:focus {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}
textarea { resize: vertical; min-height: 90px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brass);
  color: var(--ink);
  border: none;
  border-radius: 6px;
  padding: 11px 18px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
}
.btn:hover { background: var(--brass-deep); color: var(--paper); text-decoration: none; }

.btn.secondary {
  background: transparent;
  color: var(--paper);
  border: 1px solid var(--rule);
}
.btn.secondary:hover { border-color: var(--brass); color: var(--brass); background: transparent; }

.btn.danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}
.btn.danger:hover { background: var(--danger-glow); color: var(--danger); }

/* -------------------------------------------------------------------- */
/* Setlist — lesson listing                                              */
/* -------------------------------------------------------------------- */
.setlist { list-style: none; margin: 0; padding: 0; }

.setlist li {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}
.setlist li:last-child { border-bottom: none; }

.setlist .idx {
  font-family: var(--font-mono);
  color: var(--brass);
  font-size: 14px;
}

.setlist .title {
  font-weight: 600;
  font-size: 15px;
  color: var(--paper);
}
.setlist .meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper-dim);
  margin-top: 4px;
}
.setlist .desc {
  font-size: 13px;
  color: var(--paper-dim);
  margin-top: 6px;
  max-width: 60ch;
}
.setlist .actions { display: flex; gap: 8px; }

.empty {
  color: var(--paper-dim);
  font-style: italic;
  padding: 24px 0;
}

/* -------------------------------------------------------------------- */
/* Flash / alerts                                                        */
/* -------------------------------------------------------------------- */
.alert {
  border-radius: 6px;
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: 14px;
  border: 1px solid transparent;
}
.alert.success { background: rgba(111, 154, 106, 0.14); border-color: var(--ok); color: var(--ok); }
.alert.error   { background: var(--danger-glow); border-color: var(--danger); color: var(--danger); }

.helptext { color: var(--paper-dim); font-size: 13px; margin-top: 4px; }

footer.site {
  text-align: center;
  color: var(--paper-dim);
  font-size: 12px;
  padding: 40px 24px 20px;
}

/* Reduced motion respected: no non-essential motion is used anywhere. */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

@media (max-width: 560px) {
  .setlist li { grid-template-columns: 28px 1fr; }
  .setlist .actions { grid-column: 1 / -1; margin-top: 8px; }
  .topnav { flex-direction: column; align-items: flex-start; gap: 10px; }
  .topnav .links a { margin-left: 0; margin-right: 18px; }
}