/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* Universal Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Body Styles */
body {
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  color: #26232E;
  background-color: #FFEAEE;
  min-height: 100vh;
}

/* Shared width and centering for header, container, and footer */
header,
.container,
footer {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

/* Header Styles */
header {
  background-color: #95A78D;
  color: #ffffff;
  padding: 3vw 2vw;
  margin-bottom: 2vh;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(38, 35, 46, 0.2);
  text-align: left;
}

header h1 {
  font-weight: 700;
  font-size: calc(1.8rem + 1vw);
  margin-bottom: 1vh;
}

header p {
  font-weight: 300;
  font-size: calc(1rem + 0.2vw);
  opacity: 0.9;
}

/* Container for Nav + Main Side-by-Side */
.container {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  width: 100%;
  gap: 2vw;
}

/* Navigation Styles */
nav {
  background-color: #8E8DBE;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(142, 141, 190, 0.3);
  padding: 2vw 1vw;
  width: 28vw;
  min-width: 190px;
  max-width: 30vw;
  margin-bottom: 2vh;
  height: fit-content;
}

nav ul {
  list-style: none;
  padding-left: 0;
}

nav li {
  margin-bottom: 1vh;
  display: block;
}

nav a {
  color: #FFEAEE;
  text-decoration: none;
  padding: 1vw 2vw;
  border-radius: 5px;
  font-weight: 500;
  font-size: calc(0.9rem + 0.1vw);
  display: block;
  transition: background 0.3s, box-shadow 0.3s;
}

nav a:hover {
  background-color: #26232E;
  box-shadow: 0 4px 8px rgba(38, 35, 46, 0.3);
}

/* Main Content Styles */
main {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(38, 35, 46, 0.1);
  border: 1px solid #ECB8A5;
  padding: 3vw;
  min-height: 100vh;
  width: 70vw;
  max-width: 70vw;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 2vh;
  text-align: left;
  display: block;
}

main h2 {
  color: #26232E;
  margin-bottom: 2vh;
  font-size: calc(1.4rem + 0.3vw);
  font-weight: 600;
  border-bottom: 2px solid #95A78D;
  padding-bottom: 1vh;
}

main p {
  margin-bottom: 2vh;
  font-size: calc(1rem + 0.1vw);
  line-height: 1.8;
}

main ul {
  margin-left: 2vw;
  margin-bottom: 2vh;
}

main li {
  margin-bottom: 1vh;
  font-size: calc(0.95rem + 0.1vw);
}

main img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 2vh 0;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  display: block;
  margin-left: auto;
  margin-right: auto;
}

main a {
  color: #95A78D;
  text-decoration: none;
  font-weight: 500;
}

main a:hover {
  text-decoration: underline;
  color: #26232E;
}

main section {
  margin-bottom: 3vh;
}

main strong {
  color: #26232E;
  font-weight: 600;
}

/* Footer Styles */
footer {
  background-color: #26232E;
  color: #FFEAEE;
  text-align: center;
  padding: 2vw;
  margin-top: auto;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(38, 35, 46, 0.2);
}

footer p {
  font-size: calc(0.9rem + 0.1vw);
  margin: 0;
}

footer a {
  color: #95A78D;
  text-decoration: none;
  margin-left: 0.5vw;
}

footer a:hover {
  text-decoration: underline;
  color: #ECB8A5;
}

/* Calculator Styles */
.calculator-container {
  background-color: #ECB8A5;
  padding: 3vw;
  border-radius: 12px;
  margin-top: 3vh;
  box-shadow: 0 6px 20px rgba(236, 184, 165, 0.3);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
  border: 1px solid #95A78D;
}

.calculator-container h3 {
  text-align: center;
  color: #26232E;
  margin-bottom: 2vh;
  font-size: calc(1.2rem + 0.2vw);
}

.calculator-inputs {
  display: block;
  margin-bottom: 2vh;
}

.calculator-inputs input {
  padding: 1vw;
  border: 2px solid #95A78D;
  border-radius: 6px;
  font-size: calc(1rem + 0.1vw);
  background-color: white;
  color: #26232E;
  display: block;
  width: 100%;
  margin-bottom: 2vh;
}

.calculator-inputs input:focus {
  outline: none;
  border-color: #26232E;
  box-shadow: 0 0 0 3px rgba(149, 167, 141, 0.2);
}

.calculator-buttons {
  display: block;
  margin-bottom: 2vh;
}

.calculator-buttons button {
  padding: 1vw;
  border: none;
  border-radius: 6px;
  font-size: calc(1rem + 0.1vw);
  font-weight: 600;
  cursor: pointer;
  background-color: #95A78D;
  color: #FFEAEE;
  box-shadow: 0 2px 4px rgba(149, 167, 141, 0.3);
  margin-right: 1vw;
  margin-bottom: 1vh;
  display: inline-block;
  transition: background 0.3s, box-shadow 0.3s;
}

.calculator-buttons button:hover {
  background-color: #26232E;
  box-shadow: 0 4px 8px rgba(38, 35, 46, 0.3);
}

.clear-button {
  background-color: #8E8DBE !important;
}

.clear-button:hover {
  background-color: #26232E !important;
}

.calculator-output {
  background-color: white;
  padding: 1vw;
  border-radius: 6px;
  border: 2px solid #95A78D;
  min-height: 50px;
  font-size: calc(1.1rem + 0.1vw);
  font-weight: 600;
  color: #26232E;
  text-align: center;
}

.negative-result {
  color: #26232E !important;
  background-color: rgb(240, 79, 108) !important;
  border-color: #8E8DBE !important;
}

/* Responsive Layouts */

/* For screens 1000px and up */
@media screen and (min-width: 1000px) {
  header,
  .container,
  footer {
    max-width: 1200px;
  }
  .container {
    gap: 2vw;
  }
  nav {
    width: 28vw;
    max-width: 30vw;
  }
  main {
    max-width: 70vw;
    width: 70vw;
  }
  .calculator-container {
    max-width: 500px;
  }
}

/* For screens 750px–999px */
@media screen and (min-width: 750px) and (max-width: 999px) {
  header,
  .container,
  footer {
    max-width: 100vw;
  }
  .container {
    gap: 2vw;
  }
  nav {
    width: 28vw;
    max-width: 30vw;
  }
  main {
    max-width: 70vw;
    width: 70vw;
  }
}

/* For screens smaller than 750px: stack nav and main vertically */
@media screen and (max-width: 749px) {
  header,
  .container,
  footer {
    max-width: 100vw;
  }
  .container {
    flex-direction: column;
    gap: 0;
  }
  nav, main {
    width: 100vw;
    max-width: 100vw;
  }
  nav {
    margin-bottom: 2vh;
  }
  header {
    text-align: center;
  }
  nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding-left: 0;
  }
  nav li {
    display: inline-block;
    margin-right: 1vw;
    margin-bottom: 1vh;
  }
  nav a {
    display: block;
    padding: 0.5vw 1vw;
    font-size: calc(0.8rem + 0.1vw);
  }
  main {
    max-width: 100vw;
    padding: 2vw;
  }
  .calculator-container {
    padding: 2vw;
  }
  .calculator-buttons button {
    margin-right: 1vw;
    margin-bottom: 1vh;
  }
}

/* For screens smaller than 500px */
@media screen and (max-width: 499px) {
  header,
  .container,
  footer {
    max-width: 100vw;
  }
  header {
    padding-left: 2vw;
    padding-right: 2vw;
  }
  nav {
    padding: 1vw;
  }
  nav a {
    padding: 0.5vw 0.75vw;
    font-size: calc(0.7rem + 0.1vw);
  }
  main {
    padding: 1vw;
  }
  .calculator-container {
    padding: 1vw;
  }
  .calculator-buttons button {
    padding: 1vw;
    margin-right: 1vw;
    margin-bottom: 1vh;
  }
}

/* Extra small typography adjustments */
@media screen and (max-width: 375px) {
  header h1 {
    font-size: calc(1.5rem + 0.5vw);
  }
  header p {
    font-size: calc(0.9rem + 0.1vw);
  }
  main h2 {
    font-size: calc(1.2rem + 0.2vw);
  }
}