:root {
  color-scheme: dark;
  --bg: #08090d;
  --bg-2: #10131a;
  --panel: rgba(18, 22, 31, 0.76);
  --panel-solid: #121721;
  --text: #f5f1ea;
  --muted: #a9afbb;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.22);
  --hot: #ef4136;
  --warm: #fbb040;
  --cool: #55d7c6;
  --danger: #ef625a;
  --shadow: rgba(0, 0, 0, 0.42);
  --max: 1120px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 18% 8%, rgba(239, 65, 54, 0.24), transparent 30rem),
    radial-gradient(circle at 82% 20%, rgba(85, 215, 198, 0.16), transparent 28rem),
    linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 36px),
    linear-gradient(90deg, var(--bg), var(--bg-2) 54%, #090b10);
  color: var(--text);
  font: 16px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, black, transparent 82%);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.topbar,
.page {
  width: min(calc(100vw - 40px), var(--max));
  margin-inline: auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0 14px;
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  width: clamp(150px, 20vw, 220px);
}

.brand img {
  width: 100%;
  height: auto;
}

.page {
  padding: clamp(42px, 8vw, 88px) 0 82px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 720px;
  margin-bottom: 26px;
  color: var(--text);
  font-size: clamp(3.1rem, 6.8vw, 6.35rem);
  font-weight: 700;
  line-height: 0.94;
  letter-spacing: 0;
  text-wrap: balance;
}

h2 {
  margin-bottom: 18px;
  color: var(--text);
  font-size: clamp(1.55rem, 3vw, 2.6rem);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 14px;
  color: var(--text);
  font-size: clamp(1.2rem, 2vw, 1.65rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
}

p,
small {
  color: var(--muted);
}

p {
  margin-bottom: 18px;
  font-size: clamp(1rem, 1.4vw, 1.18rem);
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

button:hover,
button:focus-visible,
.poll-row:hover,
.poll-row:focus-visible {
  transform: translateY(-2px);
}

button:hover,
button:focus-visible {
  border-color: rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.07);
}

button[type="submit"],
#submit-availability,
.toolbar > button,
.poll-head > button,
.poll-actions > button {
  border-color: transparent;
  background: linear-gradient(135deg, var(--hot), var(--warm));
  color: #111217;
}

button:disabled {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(245, 241, 234, 0.45);
  cursor: not-allowed;
  transform: none;
}

button[type="submit"]:disabled,
#submit-availability:disabled,
.toolbar > button:disabled,
.poll-head > button:disabled,
.poll-actions > button:disabled {
  border-color: rgba(255, 255, 255, 0.1);
  background: #4a5059;
  color: rgba(245, 241, 234, 0.42);
  box-shadow: none;
}

button.ghost,
menu button:first-child {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

input,
textarea,
select {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(8, 9, 13, 0.62);
  color: var(--text);
  font: inherit;
  outline: none;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  border-color: rgba(85, 215, 198, 0.64);
  box-shadow: 0 0 0 3px rgba(85, 215, 198, 0.12);
}

label,
legend {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

label {
  display: grid;
  gap: 8px;
}

.auth-panel,
.poll-row,
.recipient-row,
.empty,
.alert,
.availability-day,
.day-list,
dialog {
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.08), transparent 40%),
    var(--panel);
  box-shadow: 0 28px 80px var(--shadow);
}

.auth-panel {
  max-width: 480px;
  margin: 44px auto;
  padding: clamp(24px, 4vw, 36px);
}

.stack {
  display: grid;
  gap: 16px;
}

.toolbar,
.poll-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.poll-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.toolbar p,
.poll-head p {
  max-width: 660px;
  margin-bottom: 0;
}

.poll-list,
.recipient-list {
  display: grid;
  gap: 12px;
}

.poll-row,
.recipient-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

.recipient-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(120px, 180px) auto;
}

.recipient-status {
  justify-self: end;
  text-align: right;
}

.poll-row:hover,
.poll-row:focus-visible {
  border-color: var(--line-strong);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.1), transparent 44%),
    rgba(18, 22, 31, 0.9);
}

strong {
  color: var(--text);
}

small {
  display: block;
  font-size: 0.9rem;
}

.empty,
.alert {
  padding: 16px;
}

.alert {
  border-color: rgba(239, 65, 54, 0.42);
  color: #ffaaa5;
}

dialog {
  width: min(620px, calc(100vw - 32px));
  padding: 24px;
  color: var(--text);
}

dialog::backdrop {
  background: rgba(8, 9, 13, 0.72);
  backdrop-filter: blur(8px);
}

menu {
  display: flex;
  gap: 10px;
  justify-content: end;
  margin: 6px 0 0;
  padding: 0;
}

.days-field {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.inline-day,
.two-col,
.recipient-form {
  display: grid;
  align-items: end;
  gap: 10px;
  grid-template-columns: 1fr auto;
}

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

.recipient-form {
  grid-template-columns: 1fr 1.3fr auto;
  margin-bottom: 14px;
}

.copybox {
  display: grid;
  gap: 8px;
  grid-template-columns: minmax(0, 1fr) auto;
  margin-bottom: 34px;
}

.split {
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(0, 2fr) minmax(220px, 1fr);
}

.day-list {
  margin: 0;
  padding: 18px 24px;
}

.day-list li {
  display: grid;
  gap: 4px;
  padding: 8px 0;
}

.day-list li + li {
  border-top: 1px solid var(--line);
}

.day-list .toned-date {
  font-size: 0.95rem;
}

.availability-day {
  margin-bottom: 24px;
  padding: 18px;
  user-select: none;
  -webkit-user-select: none;
}

.availability-day h2 {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
  font-size: clamp(1.45rem, 2.6vw, 2.1rem);
}

.availability-day h2 small {
  font-size: 0.95rem;
  font-weight: 500;
}

.hour-markers {
  display: grid;
  grid-template-columns: repeat(var(--segments), minmax(14px, 1fr));
  min-width: calc(var(--segments) * 14px);
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.hour-markers span {
  border-left: 1px solid var(--line);
  padding-left: 4px;
}

.timeline-scroll {
  overflow-x: auto;
  padding-bottom: 2px;
  user-select: none;
  -webkit-user-select: none;
}

.segments {
  display: grid;
  gap: 2px;
  grid-template-columns: repeat(var(--segments), minmax(14px, 1fr));
  min-width: calc(var(--segments) * 14px);
}

.segment {
  min-width: 12px;
  min-height: 44px;
  padding: 0;
  border: 0;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.1);
  -webkit-touch-callout: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.segment:hover,
.segment:focus-visible {
  transform: none;
}

.segment:hover,
.segment.hover-preview {
  background: rgba(85, 215, 198, 0.32);
}

.segment.add-preview {
  background: rgba(85, 215, 198, 0.62);
  outline: 2px solid var(--cool);
  outline-offset: -2px;
}

.segment.remove-preview {
  background: rgba(239, 65, 54, 0.5);
  outline: 2px solid var(--hot);
  outline-offset: -2px;
}

.segment.selected {
  background: linear-gradient(135deg, var(--cool), rgba(85, 215, 198, 0.58));
}

.segment.selected.hover-preview,
.segment.selected.add-preview {
  background: #38bbaa;
}

.segment.selected.remove-preview {
  background: #cf514b;
}

.segment.unavailable {
  background: repeating-linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.07),
    rgba(255, 255, 255, 0.07) 5px,
    rgba(255, 255, 255, 0.12) 5px,
    rgba(255, 255, 255, 0.12) 10px
  );
  cursor: not-allowed;
}

.segment.invalid-preview,
.segment.unavailable:hover {
  background: repeating-linear-gradient(
    135deg,
    rgba(239, 65, 54, 0.22),
    rgba(239, 65, 54, 0.22) 5px,
    rgba(239, 65, 54, 0.34) 5px,
    rgba(239, 65, 54, 0.34) 10px
  );
  outline: 2px solid var(--hot);
  outline-offset: -2px;
}

.submit-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.inline-status {
  color: var(--muted);
}

.inline-status[data-tone="success"] {
  color: var(--cool);
}

.inline-status[data-tone="error"] {
  color: #ffaaa5;
}

@media (max-width: 760px) {
  .topbar {
    align-items: start;
  }

  .toolbar,
  .poll-head,
  .poll-row {
    align-items: stretch;
    flex-direction: column;
  }

  .poll-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .recipient-row {
    align-items: stretch;
    grid-template-columns: 1fr;
  }

  .recipient-status {
    justify-self: start;
    text-align: left;
  }

  .split,
  .recipient-form,
  .two-col,
  .inline-day {
    grid-template-columns: 1fr;
  }
}