:root{
  --bg: #0b1020;
  --bg2:#0f1730;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --line: rgba(15, 23, 42, 0.12);
  --soft: rgba(15, 23, 42, 0.06);
  --primary:#2563eb;
  --primary2:#1d4ed8;
  --danger:#b91c1c;
  --shadow: 0 18px 40px rgba(0,0,0,.25);
  --radius: 18px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 700px at 20% 0%, #1b2a5a 0%, var(--bg) 45%, #070a14 100%);
}

.page{
  min-height:100%;
  padding: 56px 18px 80px;
  display:flex;
  flex-direction:column;
  align-items:center;
}

.page__header{
  width: min(1100px, 100%);
  margin-bottom: 18px;
}

.page__title{
  margin:0 0 10px;
  font-size: clamp(28px, 2.6vw, 40px);
  letter-spacing: -0.02em;
  color:#f8fafc;
}

.page__subtitle{
  margin:0;
  color: rgba(248, 250, 252, 0.78);
  font-size: 14.5px;
  line-height: 1.55;
  max-width: 820px;
}

.card{
  width: min(1100px, 100%);
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 18px 18px 20px;
}

.card__topbar{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 14px;
}

.card__month{
  font-size: 22px;
  font-weight: 780;
  letter-spacing: -0.015em;
}

.card__hint{
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.tz{
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  gap: 6px;
}

.tz__label{
  font-size: 12px;
  color: var(--muted);
}

.tz__select{
  appearance:none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 12px;
  padding: 10px 12px;
  font-weight: 650;
  font-size: 13px;
  min-width: 220px;
  outline: none;
}
.tz__select:focus{
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.weeknav{
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--soft);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap: 12px;
}

.weeknav__left{
  display:flex;
  align-items:center;
  gap: 10px;
}

.weeknav__range{
  font-weight: 780;
  letter-spacing: -0.01em;
  font-size: 14px;
}

.weeknav__right{
  font-size: 12.5px;
  color: var(--muted);
  background: rgba(100,116,139,0.10);
  border: 1px solid rgba(100,116,139,0.20);
  padding: 6px 10px;
  border-radius: 999px;
}

.iconbtn{
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  display:grid;
  place-items:center;
  cursor:pointer;
  transition: transform .06s ease, box-shadow .12s ease, background .12s ease;
}
.iconbtn:hover{ background: rgba(37,99,235,0.06); }
.iconbtn:active{ transform: translateY(1px); }
.iconbtn:disabled{
  cursor:not-allowed;
  opacity:.45;
}

.calendar{
  margin-top: 14px;
  display:grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.day{
  border: 1px solid var(--soft);
  border-radius: 16px;
  padding: 12px 12px 10px;
  display:flex;
  flex-direction:column;
  min-height: 320px;
  background: linear-gradient(180deg, rgba(15,23,42,0.02), rgba(15,23,42,0.0));
}

.day__head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:10px;
  margin-bottom: 10px;
}

.day__label{
  font-weight: 820;
  font-size: 14px;
  letter-spacing: -0.01em;
}

.day__sub{
  font-size: 12px;
  color: var(--muted);
}

.slots{
  display:flex;
  flex-direction:column;
  gap: 9px;
  overflow:auto;
  padding-right: 2px;
}

.slotbtn{
  width:100%;
  text-align:center;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid rgba(37, 99, 235, 0.18);
  background: rgba(37, 99, 235, 0.06);
  color: #0b1b4b;
  font-weight: 760;
  font-size: 13px;
  cursor:pointer;
  transition: background .12s ease, transform .06s ease, border-color .12s ease;
}
.slotbtn:hover{
  background: rgba(37, 99, 235, 0.10);
  border-color: rgba(37, 99, 235, 0.28);
}
.slotbtn:active{ transform: translateY(1px); }

.noslots{
  margin-top: 6px;
  font-size: 12.5px;
  color: var(--muted);
  padding: 8px 2px;
}

.error{
  margin-top: 14px;
  border: 1px solid rgba(185, 28, 28, 0.25);
  background: rgba(185, 28, 28, 0.07);
  color: var(--danger);
  padding: 12px 12px;
  border-radius: 14px;
  font-size: 13px;
}

/* Modal */
.modal{
  position: fixed;
  inset: 0;
  display:none;
  z-index: 50;
}
.modal[aria-hidden="false"]{ display:block; }

.modal__backdrop{
  position:absolute;
  inset:0;
  background: rgba(0,0,0,0.56);
}

.modal__panel{
  position: relative;
  width: min(560px, calc(100% - 26px));
  margin: 8vh auto 0;
  background:#fff;
  border-radius: 18px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.10);
  overflow:hidden;
}

.modal__header{
  padding: 16px 16px 12px;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 12px;
  border-bottom: 1px solid var(--soft);
}

.modal__title{
  font-weight: 860;
  font-size: 16px;
  letter-spacing:-0.01em;
}
.modal__sub{
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.form{
  padding: 14px 16px 16px;
  display:flex;
  flex-direction:column;
  gap: 12px;
}

.form__row{
  display:flex;
  flex-direction:column;
  gap: 6px;
}
.form__label{
  font-size: 12.5px;
  color: var(--muted);
}
.form__control{
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 13.5px;
  outline:none;
}
.form__control:focus{
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.form__row--readonly .readonly{
  border: 1px dashed rgba(100,116,139,0.35);
  background: rgba(100,116,139,0.06);
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 13.5px;
}

.form__actions{
  display:flex;
  justify-content:flex-end;
  gap: 10px;
  margin-top: 6px;
}

.btn{
  border-radius: 12px;
  padding: 11px 14px;
  font-weight: 780;
  font-size: 13.5px;
  border: 1px solid transparent;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap: 10px;
}
.btn--ghost{
  background:#fff;
  border-color: var(--line);
}
.btn--ghost:hover{ background: rgba(15,23,42,0.04); }

.btn--primary{
  background: var(--primary);
  border-color: rgba(37,99,235,0.65);
  color:#fff;
}
.btn--primary:hover{ background: var(--primary2); }

.btn:disabled{
  opacity:.6;
  cursor:not-allowed;
}

.btn__spinner{
  width: 14px;
  height: 14px;
  border-radius: 999px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: rgba(255,255,255,1);
  display:none;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg);} }

.form__msg{
  min-height: 18px;
  font-size: 12.5px;
  color: var(--muted);
}
.form__msg--error{ color: var(--danger); }

.success{
  padding: 18px 16px 16px;
}
.success__title{
  font-size: 18px;
  font-weight: 880;
}
.success__text{
  margin-top: 8px;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.5;
}
.success__actions{
  margin-top: 14px;
  display:flex;
  justify-content:flex-end;
}

.noscript{
  margin: 16px auto;
  width: min(900px, 100%);
  color: #f8fafc;
  padding: 12px 14px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 14px;
  background: rgba(255,255,255,0.06);
}

/* Responsive */
@media (max-width: 980px){
  .calendar{ grid-template-columns: 1fr; }
  .day{ min-height: auto; }
  .tz__select{ min-width: 200px; }
}