:root {
  --cyan: #3fbd72;
  --cyan-deep: #2f9f57;
  --cyan-soft: #eaf8ef;
  --white: #ffffff;
  --ink: #183a24;
  --muted: #5d7665;
  --shadow: 0 22px 70px rgba(47, 159, 87, 0.2);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  inset: 0;
  z-index: -2;
  background: url("assets/plant-background.png") center / cover no-repeat;
  opacity: 1;
}

body::after {
  content: "";
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  inset: 0;
  z-index: -1;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.34), rgba(232, 249, 237, 0.22));
}

.app-shell {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  padding-top: max(32px, env(safe-area-inset-top));
  padding-right: max(32px, env(safe-area-inset-right));
  padding-bottom: max(32px, env(safe-area-inset-bottom));
  padding-left: max(32px, env(safe-area-inset-left));
}

.panel {
  width: 100%;
  max-width: 920px;
  width: min(920px, 100%);
  padding: 52px;
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid rgba(63, 189, 114, 0.3);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.64);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

.title-area {
  text-align: center;
  margin-bottom: 44px;
  margin-bottom: clamp(26px, 5vw, 44px);
}

.kicker,
.modal-kicker,
.result-label {
  margin: 0;
  color: var(--cyan-deep);
  font-size: 14px;
  font-weight: 700;
}

h1 {
  margin: 8px 0 0;
  color: var(--cyan-deep);
  font-size: 46px;
  font-size: clamp(32px, 6vw, 58px);
  line-height: 1.12;
  font-weight: 800;
}

.intro {
  max-width: 680px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
  font-weight: 600;
}

.calculator {
  display: grid;
  gap: 24px;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.field {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.field span {
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 52px;
  border: 1px solid rgba(47, 159, 87, 0.3);
  border-radius: 8px;
  padding: 0 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.78);
  font: inherit;
  font-size: 18px;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  margin: 0;
}

input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 189, 114, 0.16);
}

input.is-invalid {
  border-color: #d94f4f;
  box-shadow: 0 0 0 4px rgba(217, 79, 79, 0.12);
}

.calculate-button {
  justify-self: center;
  width: 260px;
  width: min(260px, 100%);
  min-height: 56px;
  border: 0;
  border-radius: 8px;
  color: var(--white);
  background: linear-gradient(135deg, var(--cyan), var(--cyan-deep));
  box-shadow: 0 14px 30px rgba(47, 159, 87, 0.26);
  font: inherit;
  font-size: 20px;
  font-weight: 800;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.calculate-button:hover,
.calculate-button:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 38px rgba(47, 159, 87, 0.34);
}

.calculate-button:active {
  transform: translateY(0);
}

.result-card {
  display: grid;
  gap: 6px;
  min-height: 98px;
  padding: 20px;
  border: 1px solid rgba(63, 189, 114, 0.24);
  border-radius: 8px;
  background: rgba(234, 248, 239, 0.72);
  text-align: center;
}

.result-card strong {
  color: var(--cyan-deep);
  font-size: 34px;
  font-size: clamp(24px, 4.6vw, 42px);
  line-height: 1.16;
  word-break: break-word;
}

.result-process,
.modal-process {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
  white-space: pre-line;
}

.modal-backdrop {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 22px;
  padding-top: max(22px, env(safe-area-inset-top));
  padding-right: max(22px, env(safe-area-inset-right));
  padding-bottom: max(22px, env(safe-area-inset-bottom));
  padding-left: max(22px, env(safe-area-inset-left));
  background: rgba(24, 58, 36, 0.36);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.modal-backdrop[hidden] {
  display: none;
}

.modal {
  position: relative;
  width: 100%;
  max-width: 520px;
  width: min(520px, 100%);
  max-height: calc(100vh - 44px);
  overflow-y: auto;
  padding: 32px;
  border-radius: 8px;
  border: 1px solid rgba(63, 189, 114, 0.28);
  background: var(--white);
  box-shadow: var(--shadow);
  text-align: center;
  outline: none;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 8px;
  color: var(--cyan-deep);
  background: var(--cyan-soft);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.modal h2 {
  margin: 8px 0 0;
  color: var(--cyan-deep);
  font-size: 34px;
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1.15;
}

.modal-value {
  margin: 20px 0 8px;
  color: var(--ink);
  font-size: 40px;
  font-size: clamp(28px, 7vw, 48px);
  font-weight: 800;
  line-height: 1.1;
  word-break: break-word;
}

.modal-detail,
.modal-process {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
}

.modal-process {
  margin-top: 14px;
  padding: 14px;
  border-radius: 8px;
  background: var(--cyan-soft);
  text-align: left;
}

@media (max-width: 760px) {
  .app-shell {
    align-items: flex-start;
    padding: 18px;
    padding-top: max(18px, env(safe-area-inset-top));
    padding-right: max(18px, env(safe-area-inset-right));
    padding-bottom: max(18px, env(safe-area-inset-bottom));
    padding-left: max(18px, env(safe-area-inset-left));
  }

  .panel {
    padding: 24px;
  }

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

@media (max-width: 480px) {
  .app-shell {
    padding: 12px;
    padding-top: max(12px, env(safe-area-inset-top));
    padding-right: max(12px, env(safe-area-inset-right));
    padding-bottom: max(12px, env(safe-area-inset-bottom));
    padding-left: max(12px, env(safe-area-inset-left));
  }

  .panel {
    padding: 20px;
  }

  h1 {
    font-size: 32px;
  }

  .intro {
    font-size: 15px;
  }

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

  .calculate-button {
    width: 100%;
  }

  .result-card {
    min-height: 88px;
    padding: 18px 14px;
  }

  .modal {
    padding: 28px 20px;
  }
}

@media (max-width: 360px) {
  h1 {
    font-size: 28px;
  }

  input,
  .calculate-button {
    min-height: 50px;
  }

  .modal-value {
    font-size: 28px;
  }
}

@media (forced-colors: active) {
  .panel,
  input,
  .result-card,
  .modal {
    border: 1px solid CanvasText;
  }

  .calculate-button {
    border: 1px solid ButtonText;
  }
}