@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600&display=swap");

:root {
  --bg: #f5f7fb;
  --bg-accent: #eef2ff;
  --text: #111827;
  --muted: #5f6b7a;
  --card: #ffffff;
  --border: #d9dee6;
  --primary: #2d6cdf;
  --primary-strong: #1f5bd6;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Source Sans 3", "Noto Sans", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, var(--bg-accent), var(--bg) 55%);
}

h1 {
  margin: 0 0 12px;
  font-size: 24px;
  font-weight: 600;
}

.page {
  max-width: 900px;
  margin: 40px auto 64px;
  padding: 0 16px;
}

.wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
  align-items: start;
}

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

.card h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 600;
}

.settings-note {
  padding: 12px 14px;
}

.settings-note .muted {
  font-size: 12px;
  line-height: 1.4;
}

.btn {
  padding: 10px 14px;
  border: 1px solid var(--border);
  background: #f8fafc;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.08s ease;
}

.btn:hover {
  border-color: #c4ccd8;
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn.primary:hover {
  background: var(--primary-strong);
  border-color: var(--primary-strong);
}

.input,
textarea {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 100%;
  font-family: inherit;
  font-size: 14px;
}

.input:focus-visible,
textarea:focus-visible,
.btn:focus-visible,
.daybtn:focus-visible,
.slotbtn:focus-visible,
.arrow:focus-visible {
  outline: 2px solid rgba(45, 108, 223, 0.35);
  outline-offset: 2px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
}

.form-stack {
  display: grid;
  gap: 10px;
}

.advanced-settings {
  margin: 4px 0 8px;
  border: 0;
  padding: 0;
}

.advanced-settings summary {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 10px 36px 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  cursor: pointer;
  font-weight: 600;
}

.advanced-settings summary:hover {
  background: var(--bg-accent);
}

.advanced-settings summary::-webkit-details-marker {
  display: none;
}

.advanced-settings summary::marker {
  content: "";
}

.advanced-settings summary::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-50%) rotate(45deg);
  transition: transform 0.2s ease;
}

.advanced-settings[open] summary {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.advanced-settings[open] summary::after {
  transform: translateY(-50%) rotate(-135deg);
}

.summary-hint {
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
}

.advanced-settings[open] .summary-hint {
  display: none;
}

.advanced-body {
  border: 1px solid var(--border);
  border-top: 0;
  border-radius: 0 0 12px 12px;
  background: var(--bg-accent);
  padding: 12px;
}

.participant-block {
  display: grid;
  gap: 8px;
  padding: 10px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  background: var(--bg);
}

.participant-switch-row {
  display: flex;
  align-items: center;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
}

/* Schedule section */
.left {
  display: grid;
  gap: 16px;
  justify-self: center;
  width: 100%;
  max-width: 860px;
}

.weekbar {
  display: grid;
  grid-template-columns: 36px 1fr 36px;
  align-items: center;
  gap: 8px;
}

.weekbar .arrow {
  position: relative;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
}

.weekbar .arrow:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.weekbar .title {
  text-align: center;
  font-weight: 600;
  font-size: 14px;
  color: #3b4350;
}

.arrow.marked::after {
  content: "";
  position: absolute;
  right: 4px;
  top: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
}

.days {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  align-items: stretch;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
}

.daybtn {
  position: relative;
  min-width: 0;
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, transform 0.08s ease;
}

.daybtn:hover {
  border-color: #b9c3cf;
  transform: translateY(-1px);
}

.daybtn .date {
  font-weight: 700;
}

.daybtn .dow {
  font-size: 11px;
  color: #6b7280;
  white-space: nowrap;
}

/* Selected state */
.daybtn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.2);
}

.daybtn.active .dow {
  color: #eaf2ff;
  opacity: 0.95;
}

/* Day has any */
.daybtn.has-any::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  position: absolute;
  right: 6px;
  top: 6px;
}

.slot-groups {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: start;
}

.slot-col {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  align-items: start;
}

.slot-label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 12px;
  color: #65707e;
  padding: 4px 0;
  text-align: center;
}

.slotbtn {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
  width: 100%;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.08s ease;
}

.slotbtn:hover {
  border-color: #b9c3cf;
  transform: translateY(-1px);
}

/* Selected state */
.slotbtn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.slotbtn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Locked/final slot highlight */
.slotbtn.locked {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, #f2fbf2 0%, #e1f4e1 50%, #f2fbf2 100%);
  background-size: 200% 100%;
  border-color: #a6d8a6;
  border-style: dashed;
  color: #1f4d1f;
  font-weight: 600;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset, 0 6px 14px rgba(91, 170, 91, 0.18);
  animation: locked-shimmer 3.2s ease-in-out infinite, locked-pulse 4.8s ease-in-out infinite;
}

.slotbtn.locked:disabled {
  opacity: 1;
  color: #1f4d1f;
}

@keyframes locked-shimmer {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes locked-pulse {
  0%, 100% {
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset, 0 6px 14px rgba(91, 170, 91, 0.18);
  }
  50% {
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.9) inset, 0 10px 18px rgba(91, 170, 91, 0.28);
  }
}

@media (prefers-reduced-motion: reduce) {
  .slotbtn.locked {
    animation: none;
  }
}

@media (max-width: 900px) {
  .wrap {
    grid-template-columns: 1fr;
  }

  .card {
    order: 2;
  }
}

@media (max-width: 640px) {
  .slot-groups {
    grid-template-columns: 1fr;
  }

  .slot-label {
    writing-mode: horizontal-tb;
    text-orientation: mixed;
  }

  .slot-col {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .days {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}