:root {
  color-scheme: light;
  --bg: #f6f1e8;
  --bg-strong: #fffdf8;
  --panel: rgba(255, 252, 247, 0.82);
  --panel-strong: rgba(255, 255, 255, 0.94);
  --panel-muted: rgba(255, 248, 240, 0.88);
  --text: #17212b;
  --muted: #5d6a78;
  --muted-strong: #435260;
  --border: rgba(23, 33, 43, 0.11);
  --border-strong: rgba(23, 33, 43, 0.18);
  --accent: #1f5eff;
  --accent-deep: #173cae;
  --accent-soft: rgba(31, 94, 255, 0.12);
  --accent-wash: rgba(31, 94, 255, 0.08);
  --success: #0d8c6d;
  --success-soft: rgba(13, 140, 109, 0.12);
  --warning: #b8572a;
  --warning-soft: rgba(184, 87, 42, 0.12);
  --shadow-lg: 0 30px 90px rgba(23, 33, 43, 0.14);
  --shadow-md: 0 18px 48px rgba(23, 33, 43, 0.08);
  --shadow-sm: 0 10px 30px rgba(23, 33, 43, 0.06);
  --radius-xl: 36px;
  --radius-lg: 26px;
  --radius-md: 20px;
  --radius-sm: 16px;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(31, 94, 255, 0.2), transparent 28%),
    radial-gradient(circle at 88% 10%, rgba(20, 176, 147, 0.12), transparent 20%),
    radial-gradient(circle at 20% 100%, rgba(255, 177, 72, 0.14), transparent 26%),
    linear-gradient(180deg, #fbf7ef 0%, #f7f2ea 42%, #fffdf8 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(23, 33, 43, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 33, 43, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 88%);
}

body::after {
  content: "";
  position: fixed;
  inset: 24px;
  pointer-events: none;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 32px;
  opacity: 0.6;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

.page-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 56px;
}

.page-masthead {
  margin-bottom: 16px;
}

.page-main {
  display: grid;
  gap: 22px;
}

.masthead,
.tool-shell,
.explanation {
  position: relative;
  z-index: 0;
}

.masthead {
  display: grid;
  gap: 14px;
  padding: 6px 0 8px;
}

.masthead__bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.masthead__content {
  display: grid;
  gap: 12px;
  max-width: 68rem;
}

.eyebrow {
  margin: 0;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.masthead h1,
.tool-shell h2,
.explanation h2,
.result-summary h3 {
  margin: 0;
  line-height: 0.96;
  letter-spacing: -0.05em;
}

.masthead h1 {
  max-width: 10ch;
  font-size: clamp(2.6rem, 5.8vw, 4.6rem);
}

.masthead__copy {
  max-width: 60ch;
  margin: 0;
  font-size: clamp(0.98rem, 1.2vw, 1.08rem);
  line-height: 1.62;
  color: var(--muted);
}

.feature-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.feature-strip li {
  padding: 9px 13px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
  box-shadow: var(--shadow-sm);
  color: var(--muted-strong);
  font-size: 0.84rem;
  font-weight: 700;
  backdrop-filter: blur(10px);
}

.language-switcher {
  position: relative;
  display: inline-grid;
  justify-items: start;
  gap: 6px;
  min-width: min(240px, 100%);
  padding: 12px 44px 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(255, 249, 242, 0.94)),
    rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-sm);
  color: var(--muted-strong);
  backdrop-filter: blur(14px);
}

.language-switcher span {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.language-switcher select {
  appearance: none;
  width: 100%;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--text);
  font-size: 0.96rem;
  font-weight: 700;
  line-height: 1.3;
  cursor: pointer;
}

.language-switcher select:focus {
  outline: none;
}

.language-switcher::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 18px;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--muted-strong);
  border-bottom: 2px solid var(--muted-strong);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

.language-switcher:focus-within {
  border-color: var(--accent);
  box-shadow:
    0 0 0 4px var(--accent-soft),
    var(--shadow-sm);
}

.tool-shell {
  overflow: hidden;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 252, 247, 0.86)),
    var(--panel);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
}

.tool-shell::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: min(420px, 68%);
  height: 180px;
  background: radial-gradient(circle at top left, rgba(31, 94, 255, 0.14), transparent 68%);
  pointer-events: none;
}

.tool-shell__intro {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.tool-shell h2 {
  max-width: 12ch;
  font-size: clamp(1.9rem, 3.2vw, 2.8rem);
}

.compat-note {
  max-width: 32ch;
  margin: 0;
  padding: 12px 14px;
  border: 1px solid rgba(23, 33, 43, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.55);
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.tool-shell__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.92fr);
  gap: 18px;
  align-items: stretch;
}

.tool-shell__layout > * {
  min-width: 0;
}

.control-card,
.results-panel,
.explanation {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel-strong);
  box-shadow: var(--shadow-md);
}

.control-card {
  padding: 20px;
  display: grid;
  gap: 18px;
}

.results-panel {
  min-height: 100%;
  min-width: 0;
  padding: 18px;
  color: var(--muted);
}

.field-group {
  display: grid;
  gap: 8px;
}

.field {
  display: grid;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
}

.field span {
  color: var(--muted-strong);
  letter-spacing: 0.01em;
}

.field input,
.field select,
.toggle-button {
  appearance: none;
  width: 100%;
  min-height: 50px;
  padding: 0 14px;
  border: 1px solid rgba(23, 33, 43, 0.14);
  border-radius: 16px;
  background: linear-gradient(180deg, #ffffff, #fbfaf7);
  color: var(--text);
  transition:
    border-color 140ms ease,
    box-shadow 140ms ease,
    transform 140ms ease,
    background-color 140ms ease;
}

.field input:hover,
.field select:hover,
.toggle-button:hover {
  border-color: rgba(23, 33, 43, 0.22);
}

.field select {
  padding-right: 42px;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position:
    calc(100% - 20px) calc(50% - 3px),
    calc(100% - 14px) calc(50% - 3px);
  background-size: 6px 6px;
  background-repeat: no-repeat;
}

.field input:focus,
.field select:focus,
.toggle-button:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.tool-shell__actions {
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.toggle-button {
  width: auto;
  min-width: 210px;
  padding: 0 18px;
  background:
    linear-gradient(180deg, rgba(31, 94, 255, 0.12), rgba(31, 94, 255, 0.04)),
    #fff;
  color: var(--accent-deep);
  font-weight: 800;
  cursor: pointer;
}

.toggle-button:active {
  transform: translateY(1px);
}

.zone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
}

.zone-card,
.time-zone-card {
  min-height: 0;
  padding: 16px;
  border: 1px solid rgba(23, 33, 43, 0.08);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(31, 94, 255, 0.08), transparent 48%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(249, 250, 255, 0.92));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.zone-card__label {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--accent-deep);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.zone-card strong,
.result-cell strong {
  display: block;
  color: var(--text);
}

.zone-card strong {
  margin-bottom: 10px;
  font-size: 1.02rem;
}

.zone-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.time-zone-card {
  display: grid;
  gap: 14px;
}

.time-zone-card__header {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.time-zone-card__status {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--warning-soft);
  color: var(--warning);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.time-zone-card__status[hidden] {
  display: none;
}

.time-zone-card__times {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.time-zone-card--invalid {
  border-color: rgba(184, 87, 42, 0.28);
  background:
    linear-gradient(180deg, rgba(184, 87, 42, 0.08), transparent 46%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(255, 249, 246, 0.94));
}

.time-zone-card--invalid .field input,
.time-zone-card--invalid .field select {
  border-color: rgba(184, 87, 42, 0.32);
  box-shadow: 0 0 0 2px rgba(184, 87, 42, 0.05);
}

.result-state {
  height: 100%;
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 16px;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(31, 94, 255, 0.04), transparent 38%),
    var(--bg-strong);
  text-align: center;
}

.result-state p {
  margin: 0;
  line-height: 1.7;
}

.result-state--ready {
  display: grid;
  place-items: stretch;
  gap: 14px;
  text-align: start;
  padding: 0;
  background: transparent;
}

.result-summary {
  padding: 18px;
  border: 1px solid rgba(31, 94, 255, 0.1);
  border-radius: 18px;
  background:
    linear-gradient(135deg, rgba(31, 94, 255, 0.08), rgba(20, 176, 147, 0.06)),
    #fff;
}

.result-summary h3 {
  max-width: 20ch;
  margin-top: 8px;
  font-size: clamp(1.45rem, 2.2vw, 2rem);
  overflow-wrap: anywhere;
}

.result-summary p:last-child {
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.62;
}

.result-grid {
  overflow: hidden;
  min-width: 0;
  border: 1px solid rgba(23, 33, 43, 0.08);
  border-radius: 20px;
  background: #fff;
}

.result-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr) minmax(0, 0.95fr) minmax(200px, 1.35fr);
  gap: 14px;
  padding: 16px 18px;
  align-items: center;
}

.result-row + .result-row {
  border-top: 1px solid rgba(23, 33, 43, 0.08);
}

.result-row--header {
  padding-top: 12px;
  padding-bottom: 12px;
  background: var(--panel-muted);
  color: var(--muted-strong);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-cell {
  min-width: 0;
}

.result-row__zone strong,
.result-cell span,
.result-cell strong {
  overflow-wrap: anywhere;
}

.result-cell__label {
  display: none;
}

.result-cell strong,
.result-cell span {
  line-height: 1.55;
}

.result-row__bar {
  min-width: 0;
}

.time-bar-wrap {
  min-width: 0;
}

.time-bar,
.time-bar__scale {
  direction: ltr;
}

.time-bar {
  position: relative;
  height: 14px;
  border-radius: 999px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(23, 33, 43, 0.04) 0%, rgba(23, 33, 43, 0.1) 100%);
}

.time-bar__segment {
  position: absolute;
  top: 0;
  bottom: 0;
  border-radius: 999px;
}

.time-bar__segment--working {
  background: linear-gradient(90deg, rgba(31, 94, 255, 0.28), rgba(31, 94, 255, 0.54));
}

.time-bar__segment--overlap {
  background: linear-gradient(90deg, #14b093, var(--success));
  box-shadow: 0 0 0 1px rgba(13, 140, 109, 0.12);
}

.time-bar__scale {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.72rem;
  text-align: left;
  unicode-bidi: isolate;
}

.time-bar__scale span:last-child {
  text-align: right;
}

.explanation {
  padding: 24px 26px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.78), rgba(255, 250, 244, 0.92)),
    var(--panel-strong);
}

.explanation h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.explanation p {
  max-width: 68ch;
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.72;
}

html[dir="rtl"] .language-switcher {
  padding: 12px 14px 12px 44px;
}

html[dir="rtl"] .language-switcher::after {
  right: auto;
  left: 18px;
}

html[dir="rtl"] .field select {
  padding-right: 14px;
  padding-left: 42px;
  background-position:
    20px calc(50% - 3px),
    26px calc(50% - 3px);
}

html[dir="rtl"] .masthead__content,
html[dir="rtl"] .tool-shell__intro,
html[dir="rtl"] .result-summary,
html[dir="rtl"] .result-row,
html[dir="rtl"] .explanation {
  text-align: right;
}

html[dir="rtl"] .time-bar-wrap,
html[dir="rtl"] .time-bar,
html[dir="rtl"] .time-bar__scale {
  direction: ltr;
}

@media (max-width: 1120px) {
  .tool-shell__layout {
    grid-template-columns: 1fr;
  }

  .results-panel {
    min-height: 0;
  }

  .result-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .result-row__bar {
    grid-column: 1 / -1;
  }

  .result-row--header {
    display: none;
  }

  .result-cell__label {
    display: inline-block;
    margin-bottom: 6px;
    color: var(--muted);
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
}

@media (max-width: 760px) {
  body::after {
    inset: 12px;
    border-radius: 24px;
  }

  .page-shell {
    width: min(100% - 20px, 1200px);
    padding: 16px 0 40px;
  }

  .page-masthead {
    margin-bottom: 12px;
  }

  .masthead {
    gap: 12px;
    padding-top: 0;
  }

  .masthead__bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .masthead h1 {
    max-width: 9ch;
    font-size: clamp(2.2rem, 11vw, 3.4rem);
  }

  .language-switcher {
    width: 100%;
    max-width: 320px;
  }

  .tool-shell {
    padding: 18px;
    border-radius: 28px;
  }

  .tool-shell__intro {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
  }

  .control-card,
  .results-panel,
  .explanation {
    padding: 16px;
    border-radius: 22px;
  }

  .zone-grid,
  .time-zone-card__times,
  .result-row {
    grid-template-columns: 1fr;
  }

  .tool-shell__actions,
  .toggle-button {
    width: 100%;
  }

  .toggle-button {
    min-width: 0;
  }

  .result-summary {
    padding: 16px;
  }

  .result-row {
    gap: 10px;
    padding: 14px 16px;
  }

  .result-row__bar {
    grid-column: auto;
  }

  .time-bar__scale {
    font-size: 0.68rem;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}