* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --paper: #f7f9f2;
  --card: #ffffff;
  --ink: #17231c;
  --muted: #48564d;
  --line: #d5dfd6;
  --soft: #eef4ee;
  --accent: #246b3b;
  --accent-deep: #174e2c;
  --teal: #006a4e;
  --shadow: 0 12px 34px rgba(54, 75, 25, 0.08);
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: "Anek Bangla", sans-serif;
}

.festival-backdrop {
  position: fixed;
  z-index: 0;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  background: #f7f9f2;
  filter: contrast(1);
}

.festival-sun {
  position: absolute;
  top: 9vh;
  left: 7vw;
  width: clamp(150px, 22vw, 290px);
  aspect-ratio: 1;
  background: #e14d3d;
  border: clamp(10px, 1.5vw, 18px) solid #f3b43f;
  border-radius: 50%;
  opacity: .45;
  animation: sun-drift 9s ease-in-out infinite;
}

.festival-sun::before,
.festival-sun::after {
  position: absolute;
  inset: -24%;
  content: "";
  border: 1px solid #e14d3d;
  border-radius: 50%;
}

.festival-sun::after {
  inset: -42%;
  border-color: #f3b43f;
  border-style: dashed;
}

.random-circle {
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  opacity: .24;
  pointer-events: none;
}

.random-circle-one {
  top: 4vh;
  right: 18vw;
  background: #f3b43f;
  animation: circle-drift-one 11s ease-in-out infinite;
}

.random-circle-two {
  right: 4vw;
  bottom: 4vh;
  background: #5d8f18;
  animation: circle-drift-two 13s ease-in-out infinite;
}

.random-circle-three {
  bottom: -80px;
  left: 18vw;
  background: #e14d3d;
  animation: circle-drift-three 15s ease-in-out infinite;
}

.alpana {
  position: absolute;
  width: clamp(180px, 24vw, 320px);
  aspect-ratio: 1;
  border: 2px solid rgba(225, 77, 61, .66);
  border-radius: 50%;
  transform: rotate(22deg);
  animation: slow-turn 24s linear infinite;
}

.alpana::before,
.alpana::after {
  position: absolute;
  content: "";
  border: 2px solid rgba(139, 189, 36, .9);
  transform: rotate(45deg);
}

.alpana::before {
  inset: 18%;
  border-radius: 45% 55% 45% 55%;
}

.alpana::after {
  inset: 34%;
  border-radius: 50%;
}

.alpana-left {
  bottom: -70px;
  left: -80px;
}

.alpana-right {
  right: -100px;
  bottom: 4vh;
  transform: rotate(-18deg) scale(.8);
}

.festival-banner {
  position: absolute;
  top: 8vh;
  right: 7vw;
  color: #b63d31;
  font-size: clamp(24px, 4vw, 52px);
  font-weight: 700;
  letter-spacing: .04em;
  opacity: .39;
  transform: rotate(6deg);
  animation: banner-float 6s ease-in-out infinite;
}

.festival-leaf {
  position: absolute;
  width: 80px;
  height: 34px;
  border-radius: 100% 0 100% 0;
  background: #5d8f18;
  opacity: .51;
  transform: rotate(-28deg);
}

.festival-leaf::after {
  position: absolute;
  top: 50%;
  left: 8%;
  width: 85%;
  height: 1px;
  content: "";
  background: #f7f9f2;
  transform: rotate(19deg);
}

.leaf-one {
  top: 27vh;
  right: 8vw;
  animation: leaf-sway 5s ease-in-out infinite;
}

.leaf-two {
  bottom: 18vh;
  left: 8vw;
  transform: rotate(148deg) scale(.75);
  animation: leaf-sway 7s ease-in-out -1.5s infinite;
}

.canvas-line {
  position: absolute;
  top: 50%;
  width: 2px;
  height: 50px;
  background: var(--accent);
  opacity: 1;
  transform: translateY(-50%);
}

.canvas-line-long {
  height: 700px;
  opacity: .54;
}

.canvas-line-left {
  left: 24px;
}

.canvas-line-right {
  right: 24px;
}

.canvas-line-left-long {
  left: 32px;
}

.canvas-line-right-long {
  right: 32px;
}

.festival-confetti {
  position: absolute;
  color: #e14d3d;
  font-family: "DM Mono", monospace;
  font-size: 24px;
  opacity: 1;
  animation: confetti-float 7s ease-in-out infinite;
}

.confetti-one { top: 19vh; left: 38vw; }
.confetti-two { top: 31vh; left: 83vw; animation-delay: -2s; }
.confetti-three { bottom: 21vh; left: 28vw; color: #8bbd24; animation-delay: -4s; }
.confetti-four { bottom: 11vh; right: 34vw; color: #f3b43f; animation-delay: -1s; }

button {
  border: 0;
  font: inherit;
  cursor: pointer;
}

.app-shell {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 32px 20px;
}

.calculator-card {
  width: min(100%, 980px);
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  animation: rise-in 650ms cubic-bezier(.2,.8,.2,1) both;
}

.topbar,
.footer-note,
.display-panel,
.calculator-body {
  padding-left: clamp(22px, 5vw, 54px);
  padding-right: clamp(22px, 5vw, 54px);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 27px;
  padding-bottom: 24px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  background: #006a4e;
  border: 1px solid rgba(0, 80, 58, .18);
  border-radius: 8px;
  box-shadow: none;
}

.flag-mark::after {
  width: 43%;
  aspect-ratio: 1;
  content: "";
  background: #f42a41;
  border-radius: 50%;
  transform: translateX(-7%);
}

.eyebrow {
  margin: 0 0 1px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1.05;
  font-weight: 700;
}

.status-dot {
  width: 9px;
  height: 9px;
  margin-left: auto;
  background: var(--accent);
  border: 3px solid #e8f2d2;
  border-radius: 50%;
}

.display-panel {
  padding-top: 24px;
  padding-bottom: 25px;
  background: var(--soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.display-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 14px;
}

.live-label {
  color: var(--teal);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.display-value {
  display: block;
  overflow: hidden;
  margin-top: 9px;
  font-family: "DM Mono", monospace;
  font-size: clamp(42px, 8vw, 72px);
  line-height: 1.1;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.result-words {
  min-height: 23px;
  margin: 10px 0 0;
  color: var(--teal);
  font-size: 16px;
  font-weight: 500;
  text-align: right;
}

.tax-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(22px, 5vw, 54px);
  background: #f8fbea;
  border-bottom: 1px solid var(--line);
}

.tax-label,
.tax-caption {
  display: block;
}

.tax-label {
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
}

.tax-caption {
  margin-top: 1px;
  color: var(--muted);
  font-size: 12px;
}

.tax-options {
  display: flex;
  gap: 8px;
}

.tax-toggle {
  padding: 9px 13px;
  color: var(--teal);
  background: #edf5dc;
  border: 1px solid transparent;
  border-radius: 9px;
  font-size: 13px;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease, transform 140ms ease;
}

.tax-toggle:hover {
  border-color: #b9d58a;
  transform: translateY(-1px);
}

.tax-toggle.active {
  color: #faffed;
  background: var(--teal);
  border-color: var(--teal);
}

.tax-toggle:focus-visible {
  outline: 3px solid rgba(139, 189, 36, .35);
  outline-offset: 3px;
}

.preset-panel {
  padding: 24px clamp(22px, 5vw, 54px) 28px;
  background: #f8faf7;
  border-bottom: 1px solid var(--line);
}

.preset-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.preset-kicker {
  margin: 0 0 2px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 700;
}

.preset-heading h2 {
  margin: 0;
  color: var(--ink);
}

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

.preset-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.preset-card {
  min-width: 0;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.preset-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
}

.preset-card > p {
  margin: 3px 0 12px;
  color: var(--muted);
  font-size: 12px;
}

.preset-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.preset-fields label {
  display: grid;
  gap: 5px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 600;
}

.preset-fields input {
  width: 100%;
  min-width: 0;
  padding: 8px 9px;
  color: var(--ink);
  background: #fff;
  border: 1px solid #aebeb1;
  border-radius: 7px;
  font: inherit;
  font-size: 15px;
}

.preset-fields input:focus-visible {
  border-color: var(--teal);
  outline: 3px solid rgba(0, 106, 78, .2);
  outline-offset: 1px;
}

.preset-submit {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 12px;
  padding: 9px 11px;
  color: #fff;
  background: var(--teal);
  border-radius: 7px;
  font-size: 13px;
  font-weight: 700;
  text-align: left;
  transition: background 140ms ease, transform 140ms ease;
}

.preset-submit:hover {
  background: var(--accent-deep);
  transform: translateY(-1px);
}

.preset-submit:focus-visible {
  outline: 3px solid rgba(0, 106, 78, .3);
  outline-offset: 3px;
}

.calculator-body {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(220px, .7fr);
  gap: 45px;
  padding-top: 34px;
  padding-bottom: 35px;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.key {
  aspect-ratio: 1.55;
  min-height: 54px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: "DM Mono", "Anek Bangla", sans-serif;
  font-size: 19px;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, box-shadow 140ms ease;
}

.key:hover {
  background: #f8fbea;
  border-color: #bfd58c;
  transform: translateY(-2px);
}

.key:active {
  transform: translateY(1px) scale(.98);
}

.key:focus-visible,
.text-button:focus-visible {
  outline: 3px solid rgba(62, 113, 105, .35);
  outline-offset: 3px;
}

.key-muted {
  color: var(--muted);
  background: var(--soft);
  border-color: transparent;
  font-size: 15px;
}

.key-operator {
  color: var(--teal);
  background: #edf5dc;
  border-color: transparent;
  font-size: 24px;
}

.key-equals {
  color: #faffed;
  background: var(--accent);
  border-color: var(--accent);
  font-size: 25px;
  box-shadow: none;
}

.key-equals:hover {
  color: #faffed;
  background: var(--accent-deep);
  border-color: var(--accent-deep);
}

.key-zero {
  grid-column: span 2;
  aspect-ratio: auto;
}

.history-panel {
  min-width: 0;
  border-left: 1px solid var(--line);
  padding-left: 28px;
}

.history-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 15px;
}

h2 {
  margin-bottom: 18px;
  font-size: 17px;
  font-weight: 600;
}

.text-button {
  padding: 0;
  color: var(--accent);
  background: transparent;
  font-size: 13px;
}

.text-button:hover {
  color: var(--accent-deep);
  text-decoration: underline;
}

.history-list {
  max-height: 250px;
  overflow: auto;
}

.empty-history {
  color: var(--muted);
  font-size: 14px;
}

.history-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.history-expression {
  display: block;
  overflow: hidden;
  color: var(--muted);
  font-family: "DM Mono", monospace;
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-result {
  display: block;
  margin-top: 3px;
  font-family: "DM Mono", monospace;
  font-size: 19px;
}

.history-words {
  display: block;
  margin-top: 2px;
  color: var(--teal);
  font-size: 13px;
}

.footer-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 16px;
  padding-bottom: 19px;
  color: var(--muted);
  background: #fbfcf8;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

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

.install-button,
.install-link {
  padding: 7px 11px;
  color: #315400;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.install-button:hover,
.install-link:hover {
  background: #e7f1d8;
}

.key-hint {
  font-family: "DM Mono", monospace;
  font-size: 12px;
}

.key-hint b {
  color: var(--accent);
}

@keyframes rise-in {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes sun-drift {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(12px, 8px, 0); }
}

@keyframes slow-turn {
  from { transform: rotate(22deg); }
  to { transform: rotate(382deg); }
}

@keyframes banner-float {
  0%, 100% { transform: rotate(6deg) translateY(0); }
  50% { transform: rotate(4deg) translateY(-8px); }
}

@keyframes leaf-sway {
  0%, 100% { margin-top: 0; }
  50% { margin-top: 8px; }
}

@keyframes confetti-float {
  0%, 100% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-16px) rotate(18deg); }
}

@keyframes circle-drift-one {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-18px, 16px); }
}

@keyframes circle-drift-two {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(16px, -14px); }
}

@keyframes circle-drift-three {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(20px, -12px); }
}

@media (prefers-reduced-motion: reduce) {
  .festival-backdrop * {
    animation: none;
  }
}

@media (max-width: 700px) {
  .random-circle {
    width: 300px;
    height: 300px;
  }

  .random-circle-one {
    right: -120px;
  }

  .random-circle-two {
    right: -150px;
  }

  .random-circle-three {
    left: -120px;
  }
}

@media (max-width: 700px) {
  .app-shell {
    padding: 14px;
  }

  .canvas-line-left {
    left: 10px;
  }

  .canvas-line-right {
    right: 10px;
  }

  .canvas-line-left-long {
    left: 18px;
  }

  .canvas-line-right-long {
    right: 18px;
  }

  .calculator-card {
    border-radius: 18px;
  }

  .calculator-body {
    display: block;
  }

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

  .preset-hint {
    max-width: 145px;
    text-align: right;
  }

  .tax-options {
    width: 100%;
  }

  .tax-toggle {
    flex: 1;
    padding-right: 8px;
    padding-left: 8px;
  }

  .history-panel {
    margin-top: 30px;
    padding-top: 24px;
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .keypad {
    gap: 8px;
  }

  .key {
    min-height: 52px;
  }
}

@media (max-width: 400px) {
  .topbar,
  .footer-note,
  .display-panel,
  .calculator-body,
  .tax-toolbar,
  .preset-panel {
    padding-left: 16px;
    padding-right: 16px;
  }

  .preset-grid {
    grid-template-columns: 1fr;
  }

  .preset-card {
    padding: 14px;
  }

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

  .app-install-actions {
    width: 100%;
    flex-wrap: wrap;
    gap: 8px;
  }

  .keypad {
    gap: 6px;
  }
}