:root {
  --bg-light: #e7f0f2;
  --bg-dark: #1d1f2a;
  --text-light: #1a1a1a;
  --text-dark: #f5f5f5;
  --container-light: #ffffff;
  --container-dark: #2c2c3c;
  --input-light: #f4f4f4;
  --input-dark: #3e3e50;
  --accent: #4da8da;
}

body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: var(--bg-light);
  color: var(--text-light);
  transition: all 0.3s ease;

}

body,
html {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}


body.dark {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

body.dark .nav {
  background-color: var(--container-dark);
}


main {
  flex: 1;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--container-light);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 999;
  flex-wrap: wrap;
}

.header-left {
  flex: 1;
}

.header-right {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  position: relative;
}

body.dark .header {
  background-color: var(--container-dark);
}

.header h1 {
  margin: 0;
}



.nav {
  display: flex;
  gap: 1rem;
}

.nav a {
  text-decoration: none;
  color: inherit;
  font-weight: bold;
}

.menu-toggle {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 24px;
  width: 30px;
  position: relative;
  z-index: 1000;
}

.menu-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: var(--text-light);
  border-radius: 3px;
  transition: all 0.3s ease;
}

body.dark .menu-toggle span {
  background-color: var(--text-dark);
}

/* Add slight hover effect */
.menu-toggle:hover span {
  opacity: 0.8;
}

.theme-toggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

.main-container {
  width: 66%;
  margin: 2rem auto;
  padding: 0 1rem;
}

.fit-image {
  width: 40%;
}
.calc-row .full-width{
  display: flex;
  flex-direction: column;
  align-items: center;
}
.calc-row {
  
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2rem;
}

.calc-section {
  flex: 1;
  width: 90%;
  background-color: var(--container-light);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.calc-common-section {
  flex: 1;
  min-width: 300px;
  background-color: var(--container-light);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

body.dark .calc-section {
  background-color: var(--container-dark);
}

.calc-section h2,
h3 {
  color: var(--accent);
}

.calc-section .section-header {
  font-size: 1.5em;
  margin-block-start: 0.83em;
  margin-block-end: 0.83em;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
  font-weight: bold;
  unicode-bidi: isolate;
  color: #4da8da;
}

.calc-section input {
  /* width: calc(50% - 0.5rem); */
  width: 95%;
  padding: 0.7rem;
  margin: 0.5rem 0.5rem 1rem 0;
  border-radius: 6px;
  border: none;
  background-color: var(--input-light);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
  transition: all 0.3s;
  font-size: 1rem;
}

.calc-btn-group {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 1rem;
}

body.dark .calc-section input {
  background-color: var(--input-dark);
  color: var(--text-dark);
}

.calc-section button {
  background-color: var(--accent);
  color: white;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.calc-section button:hover {
  background-color: #3c94c6;
}

.result {
  font-weight: bold;
  margin-top: 0.6rem;
}

.example {
  margin-top: 0.3rem;
  font-size: 0.85rem;
}

body.light .example {
  color: var(--text-light);
}

body.dark .example {
  color: var(--text-dark);
}

footer {
  background-color: var(--container-light);
  color: var(--text-color);
  padding: 1rem;
  text-align: center;
  margin-top: auto;
}

body.dark footer {
  background-color: var(--container-dark);
  color: var(--text-color);
}

/* Responsive Menu */
@media (max-width: 768px) {
  .nav {
    display: none;
    flex-direction: column;
    position: absolute;
    right: 0;
    top: 60px;
    background-color: var(--container-light);
    border-radius: 6px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 0.5rem 1rem;
  }

  body.dark .nav {
    background-color: var(--container-dark);
  }

  .nav {
    display: none;
  }

  .nav.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .theme-toggle {
    order: 3;
    margin-top: 0.5rem;
  }

  .main-container {
    width: 90%;
    margin: 2rem auto;
    padding: 0 1rem;
  }

  .fit-image {
    width: 90%;
  }
}

/* On large screens - show nav inline */
@media (min-width: 769px) {
  .nav {
    display: flex !important;
    position: static;
    flex-direction: row;
    box-shadow: none;
    background: none;
  }

  .menu-toggle {
    display: none;
  }
}