/* ---------- Brand tokens (flat dark theme) ---------- */
:root{
  --bg: #0b0b0c;
  --bg-2: #121216;

  --panel: #1a1a1f;
  --panel-2: #23232b;

  --border: rgba(167,168,172,.18);

  --text: rgba(250,250,249,.94);
  --muted: rgba(167,168,172,.80);

  --brand: #a1b84a;      /* olive accent */
  --brand-2: #58546e;    /* plum/navy */
  --brand-3: #a7a8ac;    /* silver */

  --danger: #d85c6a;

  --shadow: 0 12px 36px rgba(0,0,0,.40);

  --radius: 16px;
  --radius-sm: 12px;

  --focus: 0 0 0 3px rgba(161,184,74,.28);

  --control-py: 10px;
  --control-px: 12px;
  --control-radius: 12px;
  --control-minh: 44px;

  --gap: 16px;
}

/* ---------- Base ---------- */
*{ box-sizing:border-box; }
html, body{ height:100%; }

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  color: var(--text);
  background: var(--bg);
  line-height: 1.45;
}

.container{
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 18px 44px;
}

/* ---------- Headings ---------- */
h1,h2,h3,h4{
  margin:0 0 10px;
  letter-spacing:-0.02em;
}

h1{
  font-size:2rem;
  font-weight:800;
}

h1::after{
  content:"";
  display:block;
  width:80px;
  height:3px;
  margin-top:10px;
  background: var(--brand);
}

h2{ font-size:1.25rem; }
h3{ font-size:1.05rem; margin-top:8px; }
h4{ font-size:.98rem; color:var(--muted); font-weight:600; }

hr{
  border:0;
  height:1px;
  background:var(--border);
  margin:16px 0;
}

/* ---------- Status messages ---------- */
#status, #error{
  margin:12px 0;
  padding:10px 12px;
  border-radius:var(--radius-sm);
}

#status{
  background: rgba(161,184,74,.10);
  border:1px solid rgba(161,184,74,.30);
}

#error{
  background: rgba(216,92,106,.12);
  border:1px solid rgba(216,92,106,.35);
}

/* ---------- Cards ---------- */
.student-card{
  background: var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px;
  margin:var(--gap) 0;
  box-shadow:var(--shadow);
}

.box{
  background: var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:var(--shadow);
}

/* ---------- Programs layout ---------- */
.programs{
  display:grid;
  grid-template-columns:1fr 2fr;
  gap:14px;
  align-items:start;
}

@media (max-width:880px){
  .programs{ grid-template-columns:1fr; }
}

.program-block{
  background: var(--panel-2);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:14px;
}

/* ---------- Input grid ---------- */
.grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}

@media (max-width:700px){
  .grid{ grid-template-columns:1fr; }
}

/* ---------- Labels ---------- */
label{
  display:grid;
  gap:6px;
  margin:0;
  font-size:.92rem;
  color:var(--muted);
}

/* ---------- Inputs ---------- */
input, select, textarea{
  width:100%;
  min-height:var(--control-minh);
  border-radius:var(--control-radius);
  border:1px solid rgba(167,168,172,.25);
  background:#101115;
  color:var(--text);
  padding:var(--control-py) var(--control-px);
  outline:none;
  font-size:1rem;
}

input::placeholder,
textarea::placeholder{
  color:rgba(167,168,172,.55);
}

input:focus, select:focus, textarea:focus{
  border-color:var(--brand);
  box-shadow:var(--focus);
}

input:disabled, select:disabled{
  opacity:.55;
  cursor:not-allowed;
}

/* ---------- Select arrow ---------- */
select{
  appearance:none;
  padding-right:40px;
  background-image:
    linear-gradient(45deg, transparent 50%, rgba(255,255,255,.6) 50%),
    linear-gradient(135deg, rgba(255,255,255,.6) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) calc(50% - 3px),
    calc(100% - 12px) calc(50% - 3px);
  background-size:6px 6px,6px 6px;
  background-repeat:no-repeat;
}

/* ---------- Checkbox list ---------- */
.checkbox-list{
  display:grid;
  gap:10px;
  margin-top:8px;
}

.checkbox-row{
  display:flex;
  gap:10px;
  align-items:center;
  padding:10px;
  border-radius:12px;
  border:1px solid transparent;
  background: rgba(255,255,255,.03);
  cursor:pointer;
}

.checkbox-row:hover{
  border-color:var(--border);
  background: rgba(255,255,255,.05);
}

.checkbox-row input[type="checkbox"]{
  width:18px;
  height:18px;
  accent-color:var(--brand);
  transform:scale(1.18);
}

/* ---------- Private lessons ---------- */
.private-lessons{
  display:grid;
  gap:12px;
}

.private-lessons-list{
  display:grid;
  gap:12px;
  padding:10px;
  border-radius:var(--radius);
  border:1px solid var(--border);
  background: rgba(255,255,255,.02);
  max-height:520px;
  overflow-y:auto;
}

.private-lesson{
  border-radius:var(--radius);
  border:1px solid var(--border);
  background: rgba(255,255,255,.03);
  padding:14px;
}

.lesson-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:12px;
}

.muted{ color:var(--muted); }
.small{ font-size:.9rem; }

/* ---------- Availability matrix ---------- */
.matrix-wrap{
  overflow-x:auto;
  border-radius:14px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.02);
  margin-top:10px;
}

.matrix{
  width:100%;
  border-collapse:separate;
  border-spacing:0;
  min-width:520px;
}

.matrix th, .matrix td{
  border-bottom:1px solid var(--border);
  border-right:1px solid var(--border);
  padding:10px 8px;
  text-align:center;
}

.matrix .time-cell{
  text-align:left;
  padding-left:12px;
  font-weight:700;
  color:var(--muted);
  background: rgba(255,255,255,.03);
}

.matrix input[type="checkbox"]{
  width:18px;
  height:18px;
  accent-color:var(--brand);
}

/* ---------- Buttons ---------- */
.btn, button{
  appearance:none;
  border-radius:12px;
  padding:10px 14px;
  min-height:44px;
  cursor:pointer;
  font-weight:700;
  border:1px solid rgba(167,168,172,.25);
  background: rgba(255,255,255,.06);
  color:var(--text);
}

.btn:hover, button:hover{
  background: rgba(255,255,255,.10);
}

#submitRegistration,
.btn.primary{
  background: var(--brand);
  border-color: var(--brand);
  color:#111;
}

#submitRegistration:hover{
  background:#b6cf58;
}

/* ---------- Deposit disclosure ---------- */
.deposit-note{
  margin-top:1rem;
  margin-bottom:1rem;
  color:var(--brand-3);
  font-size:.95rem;
  padding:12px 14px;
  border-left:3px solid var(--brand);
  background: rgba(161,184,74,.07);
  border-radius:10px;
}

/* ---------- Utilities ---------- */
.row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}

@media (max-width:700px){
  .row{ grid-template-columns:1fr; }
}

.check{ display:block; margin:6px 0; }
.hint{ font-size:.95rem; color:var(--muted); }

.lesson{
  border:1px dashed var(--border);
  padding:12px;
  border-radius:var(--radius);
  margin:10px 0;
}