:root {
    --cold-blue: #f0f8ff;
    --primary-blue: #d0e9ffd0;
    --primary-white: #fff;
    --primary-font: "Michroma";
    --secondary-font: "Bebas Neue";
    --primary-font-color: #000;
    --gradient: linear-gradient(to bottom right, #ffffff 20%, #d0e9ffcc 60%, #a3d4ff80 100%);

    --dark-blue: #a8c9ff;       
    --darker-blue: #6c9effcc;   
    --btn-blue: #2e3b4e;
    --btn-blue-hover: #41536e;
    --transition-speed: 0s;
}
* {
  transition: background-color var(--transition-speed),
              color var(--transition-speed),
              border-color var(--transition-speed);
}
body {
  overflow-x: hidden;
  font-family: var(--primary-font), sans-serif;
  user-select: auto;
  position: relative;
    z-index: -1;
    background-color: var(--primary-white);
}
h1, h2, h3, h4 {
  font-family: var(--primary-font), sans-serif;
        font-weight: 900;
        letter-spacing: 8px;
        text-shadow: none;
}
h4 {
        letter-spacing: 0px;
}
table {
    font-size: .6vw;
}
#container {
    width: 100vw;
    color: var(--primary-font-color);
    display: grid;
    overflow-x: hidden;
    gap: 64px;
    position: relative;
    z-index: 1;
}
#burger-menu {
    display: flex;
    opacity: 1;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 32px;
    position: fixed;
    top: 4rem;
    right: 2rem;
    transition: .3s;
    z-index: 99;
}
#burger-menu.invisible {
    opacity: 0;
}
#burger-menu.clicked {
    background-color: var(--btn-blue-hover);
    border-bottom-left-radius: 24px;
    border-bottom-right-radius: 24px;
}
#burger-btn {
    width: 32px;
    height: 32px;
    background: url(img/burger-menu.svg);
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
    transition: 0.3s;
    background-color: var(--primary-white);
}
#burger-btn.burger-clicked {
    transform: rotate(-90deg);
}
#burger-menu-btns {
    opacity: 0;
    transform: translateY(-20px);
    transition: 0.3s;
    pointer-events: none;
    width: 32px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 12px;
    align-items: center;
    justify-content: center;
}
#burger-menu-btns.burger-clicked {
    opacity: 1;
        transform: translateY(0);
    pointer-events: auto;
    
}
#burger-menu-btns .lang-btn {
        display: flex;
    flex-direction: column;
        height: 72px;
    width: 32px;
    padding: 6px 12px;
    font-size: .5vw;
}
#burger-menu-btns > * {
    margin: 0;
    transition: opacity 0.5s
}
.info-btn {
    border-radius: 100%;
    padding: 12px;
    background-color: white;
}
.info-btn-icon {
    background-image: url(img/info.svg);
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
}
.info-modal {
    width: 100vw;
    height: 100vh;
    position: fixed;
    top: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2;
}
#info-modal-popup {
    position: absolute;
    width: 80vw;
    height: 80vh;
    padding: 24px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 2px 2px 10px #00000055;
    z-index: 3;
    background-color: var(--primary-white);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.info-modal.toggle {
    opacity: 0;
    pointer-events: none;
}
#modal-disclaimer {
    padding: 6px;
}
body.overflow-hidden {
    overflow: hidden;
}
#info-close-btn {
    padding: 12px;
    background: url(img/close.svg);
    position: absolute;
    top: 0;
    right: 0;
}
.bold {
    font-weight: 900;
    font-size: .7vw;
}
#top-section {
    display: grid;
    grid-template-columns: 3fr 1fr;
    position: relative;
}
#top-main {
    border-bottom-right-radius: 4rem;
    height: 550px;
    background: var(--gradient);
    overflow: hidden;
    position: relative;
}
#top-main-content {
    display: flex;
    flex-direction: column;
    width: 40vw;
    gap: 16px;
    align-items: flex-start;
    text-align: justify;
    margin-top: 4rem;
    margin-left: 16%;
    position: relative;
}
#top-main::before {
    content: '';
    background-image: url(img/wave1.svg);
    background-size: contain;
    background-position: left;
    background-repeat: no-repeat;
    position: absolute;
    top: 0;
    left: 0;
    opacity: .1;
    height: 100%;
    width: 100%;
    transform: scale(1.1);
}
#top-main h1 {
    font-size: 2.5vw;
    text-align: left;
}
#top-main p {
    font-size: 1vw;
}
#bmi-form {
    width: 24vw;
    height: 48vh;
    position: absolute;
    top: 4rem;
    right: 12%;
    background-color: var(--primary-white);
    box-shadow: 4px 4px 12px rgba(0, 0, 0, 0.473);
    display: flex;
    font-size: .65vw;
}
#bmi-form h3 {
    text-shadow: none;
    font-weight: 700;
    letter-spacing: 2px;
    font-size: 1rem;
}
.form{
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: repeat(5, 1fr);
    gap: 32px;
    padding: 2vw;
}
#bmi-form input {
    width: 100%;
    height: 32px;
    background-color: var(--cold-blue);
    text-align: center;
}
#bmi-form h3 {
    grid-area: 1 / 1 / 2 / -1;
}

#age-metric {
    grid-area: 2 / 1 / 3 / 3;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    
}
#age-metric button {
    width: 100%;
    height: 32px;
}

#gender-menu {
    grid-area: 3 / 1 / 4 / -1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 32px;

}
#gender-menu-btns div {
    display: flex;
    align-items: center;
    gap: 6px;
}
#gender-menu h4 {
    text-shadow: none;
}
#gender-menu-btns {
    display: flex;
    align-items: center;
    gap: 8px;
}
.gender-btn {
    height: 16px;
    width: 16px;
    border-radius: 50%;
    margin-left: 16px;
    position: relative;
    background-color: var(--primary-white);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease-out;
}
.gender-btn.selected {
    background-color: none; 
    border: none;
    pointer-events: none;
}
.gender-btn.selected::after {
    content: '';
    display: block; 
    position: absolute; 
    margin-right: 16px;
    width: 32px;
    height: 32px; 
    background-image: url(img/gender-btn-selected.svg);
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: .5;
    transform: scale(0.5); 
    animation: dolphinPopIn 0.1s ease-out forwards;
}
@keyframes dolphinPopIn {
    to { opacity: 1; transform: scale(1); }
}
#weight-input {
    grid-area: 4 / 1 / 5 / 2;
        height: 32px;
}
#height-input {
    grid-area: 4 / 2 / 6 / 3;
        height: 32px;
        padding: 0;
}
#submit-menu {
    grid-area: 5 / 1 / 6 / -1;
    display: flex;
    gap: 32px;
}
#submit-menu button {
    width: 100%;
    height: 32px;
}
button {
    border: outset 2px var(--cold-blue);
    background-color: var(--primary-white);
}
button:hover {
    background-color: var(--cold-blue);
    border: inset 2px var(--cold-blue);
}
.bmi-result-window {
    width: 100%;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 24px;
}
.bmi-result-window span {
    margin: 0;
}
.bmi-result-exit-btn {
padding: 12px;
background: url(img/close.svg);
background-repeat: no-repeat;
position: absolute;
top: 0;
right: 0;
background-color: var(--cold-blue);
}
#mid-section {
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 64px;
    padding: 1vw;
}
#mid-left {
    margin-top: 8rem;
    margin-left: 4%;
    width: 350px;
    height: 350px;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    background-image: url(img/dolphin.png);
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
}
#left-main-background {
    width: 350px;
    height: 200px;
    background: var(--gradient);
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
    box-shadow: -4px -4px 20px var(--primary-blue);
    position: relative;
}
#mid-right {
    display: flex;
    flex-direction: column;
    gap: 16px;
    text-align: justify;
    margin-top: 8rem;
    margin-right: 4%;
    grid-area: 1 / 5 / 2 / 6;
    font-size: .8vw;
}
#bot-section {
    margin-top: 8rem;
    display: grid;
    grid-auto-flow: row;
    grid-template-columns: 1fr 2fr 1fr;

}
#bot-section p {
    font-size: .8vw;
}
#bot-section-container {
    grid-column: 2;
    text-align: justify;
    gap: 64px;
    display: flex;
    flex-direction: column;
    font-size: 1.5vw;
}
#origin-para {
    font-size: 1.5vw;
    display: flex;
    flex-direction: column;
    align-items: center;
}
li {
    font-size: .6vw;
    list-style: georgian outside;
    margin: 1rem;
    text-indent: 16px;
}
li::marker {
    font-weight: 900;
    font-size: .8vw;
}
#who-bmi-chart {
    font-size: 1.5vw;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}
strong {
    font-size: 1.6vw;
    align-self: flex-start;
    margin: 16px 0;
    font-family: var(--primary-font), sans-serif;
    position: relative;
    display: inline-block;
    perspective: 600px;
}
span {
    font-size: 1.3vw;
    font-weight: 900;
    letter-spacing: 4px;
    font-family: var(--secondary-font), sans-serif;
    margin-top: 32px;
}
.age-bmi-recommendations-simple {
    display: flex;
    flex-direction: column;
    font-size: .8vw;
}
.detail-section {
    display: flex;
    flex-direction: column;
}
.bmi-table {
    font-size: .8vw;
    display: flex;
    flex-direction: column;
}
.bmi-table-simple-container {
    max-width: 800px;
    margin: auto;
    background-color: var(--primary-white);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.bmi-table-simple {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 30px;
}
.bmi-table-simple th,
.bmi-table-simple td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}
.bmi-table-simple th {
    background-color: #e2e6ea;
    font-weight: bold;
    color: #555;
}
td {
    background-color: var(--cold-blue);
}

.bmi-table-simple .category-starvation td:first-child { background-color: #ced4da; color: black;}
.bmi-table-simple .category-underweight-severe td:first-child { background-color: #d1ecf1;  color: black; }
.bmi-table-simple .category-underweight td:first-child { background-color: #d1ecf1; color: black;}
.bmi-table-simple .category-normal td:first-child { background-color: #d4edda; color: black;}
.bmi-table-simple .category-overweight td:first-child { background-color: #fff3cd; color: black;}
.bmi-table-simple .category-obese-1 td:first-child { background-color: #f8d7da; color: black;}
.bmi-table-simple .category-obese-2 td:first-child { background-color: #dc3545; color: white;}
.bmi-table-simple .category-obese-3 td:first-child { background-color: #a71d2a; color: white;}

.age-bmi-recommendations-simple h2 {
    text-align: center;
    margin-bottom: 15px;
    color: #333;
}
.age-bmi-recommendations-simple ul {
    list-style: disc;
    padding-left: 25px;
}
.age-bmi-recommendations-simple li {
    margin-bottom: 8px;
}
#bmi-limitations {
    z-index: -1;
}
.blue {
    background-color: var(--primary-blue);
    width: 100%;
    border-top-left-radius: 100%;
}
.bmi-table.formula td {
    background-color: var(--primary-white);
    border: none;
    font-family: var(--secondary-font);
    font-size: 24px;
    font-weight: 900;
}
.fraction {
    display: inline-block;
    vertical-align: middle;
    font-family: var(--secondary-font);
    font-family: var(--primary-font);
    font-family: var(--secondary-font);

}
.fraction > span {
    display: block;
    padding: 0 6px;
    font-family: var(--primary-font);
    font-family: var(--secondary-font);

    font-size: 24px;

}
.fraction .top {
    border-bottom: 2px solid var(--primary-font-color);
}
.power {
    font-size: 0.75em;
    vertical-align: super;
    text-shadow: none;
}
em {
    font-size: 8px;
    vertical-align: super;
}
.bmi-table-container {
    margin-top: 32px;
}
#fixed-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
        background: var(--gradient);
  box-shadow: 4px 0px 10px rgba(0, 0, 0, 0.536);
  height: 8vh;
  padding: 24px;
  transform: translateY(-100%);
  transition: transform 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1;
}
#fixed-header-btns {
    display: flex;
    align-items: center;
    font-size: .5vw;
    z-index: 1;
}
#fixed-header-btns button,
#burger-menu button {
    background-color: var(--btn-blue);
}
#fixed-header-btns button:hover,
#burger-menu button:hover {
    background-color: var(--btn-blue-hover);
}
#fixed-header span,
#footer-logo {
    margin: 0;
    margin-left: 16px;
    color: var(--primary-font-color);
}
    #fixed-header span:hover,
    #footer-logo:hover {
    cursor: pointer;
    opacity: .8;
    transform: scale(1.1);
}
#fixed-header.visible {
  transform: translateY(0);
}
.dark-mode {
    border-radius: 100%;
    padding: 12px;
    background-color: var(--primary-blue);
    margin-right: 16px;
}
.lang-btn {
    display: flex;
    align-items: center;
    justify-content: space-around;
    border-radius: 24px;
        background-color: white;
    margin-right: 16px;
    width: 72px;
    height: 32px;
    padding: 12px 6px;
}
.lang-btn-icon {
    background-image: url(img/english.svg);
    padding: 8px;
    border-radius: 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    border: solid 2px lightgrey;
}
.lang-btn-icon.lang-clicked {
    background-image: url(img/polish.svg);
    order: 2;
}
.lang-btn-icon,
.lang-btn-text {
    transition: 0.2s ease-in-out;

}
#bmi-formula-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
#bmi-formula-title button {
    font-size: .5vw;
    padding: 6px;
}
.disabled-btn {
    background-color: var(--cold-blue);
    pointer-events: none;
    cursor: not-allowed;

}
.light-mode-btn-icon {
    background-image: url(img/light-mode.svg);
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
}
.dark-mode-btn-icon {
    background-image: url(img/dark-mode.svg);
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
}
#who-graph {
    width: 100%;
    height: 500px;
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}
.dark-who-graph {
    background: url(img/bmi-chart-dark.png);
}
.light-who-graph {
    background: url(img/bmi-chart.png);
}
.animate-on-scroll {
  opacity: 0;
  transform: translateY(40px) scale(0.97) rotateX(6deg);
  transform-origin: bottom center;
  filter: blur(2px);
  transition:
    opacity 0.6s ease-out,
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    filter 0.6s ease-out;
  will-change: transform, opacity, filter;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0) scale(1) rotateX(0deg);
  filter: blur(0);
}
u {
    cursor: help;
    position: relative;
    display: inline-block;
    background-color: var(--cold-blue);
}
.popup-info {
    position: absolute;
    top: 32px;
    left: 50%;
    transform: translateX(-50%);
    max-width: 400px;
    width: max-content;       
    background: var(--gradient);
    border-radius: 16px;
    box-shadow: -4px -4px 10px var(--primary-blue);
    padding: 16px 24px;       
    font-size: 0.6vw;
    font-weight: 900;
    word-break: break-word;
    text-align: left;
    line-height: 1.5;
}
.popup-info u {
    hyphens: auto;
    margin: 0;
}
.hidden {
    display: none;
}
#footer-logo {
    justify-self: left;
}
#footer-logo:hover {
    cursor: pointer;
    opacity: .8;
    transform: scale(1.1);

}
#footer {
    width: 100%;
    padding: 24px;
    background: var(--gradient);
    box-shadow: -2px 0px 10px rgba(0, 0, 0, 0.233);
    margin-top: 64px;
    display: grid;
    grid-auto-flow: column;
    grid-template-columns: repeat(3, 1fr);
    color: var(--primary-font-color);
    position: relative;
    align-items: center;
}
#footer::before,
#fixed-header::before {
    content: '';
    background-image: url(img/dolphin-logo.png);
    position: absolute;
    top: 0;
    left: 0;
    background-position: center;
    background-size: contain;
    background-repeat: no-repeat;
    pointer-events: none;
    opacity: .5;
    width: 124px;
    height: 100%;
}
#disclaimer {
    text-align: left;
    font-size: 8px;
    opacity: .6;
    justify-self: right;
    position: relative;
}
#footer::after {
    content: '';
    background-image: url(img/dolphin-disclaimer.png);
    position: absolute;
    top: -80%;
    right: 5%;
    background-position: center;
    background-size: contain;
    background-repeat: no-repeat;
    pointer-events: none;
    width: 360px;
    height: 124px;
    z-index: -1;
    transform: scaleX(-1);
}
#disclaimer span {
    font-family: var(--primary-font);
    font-size: 8px;
    letter-spacing: 0px;
    text-decoration: underline;
    color: #EF476F;
    font-weight: 900;
}
#footer div {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
}
#media {
    display: flex;
    z-index: 1;
}
.mediaIcon {
  max-width: 40px;
  max-height: 40px;
  border-radius: 50%;
  transition: 0.5s;
  box-shadow: 0 0 20px var(--primary-white);
}
.mediaIcon:hover {
  transform: rotate(360deg) scale(1.2) translate(4px, 4px);
  box-shadow: 0 0 20px var(--primary-blue);
  cursor: pointer;
}
.bubble-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  will-change: transform, opacity;
}
.bubble {
  position: absolute;
  border-radius: 50%;
  animation-name: riseScroll;
  animation-iteration-count: infinite;
  will-change: transform, opacity;

  background: radial-gradient(
    circle at 30% 30%,
    var(--dark-blue),
    rgba(255, 255, 255, 0) 70%
  );
  backdrop-filter: blur(4px);
}
@keyframes riseScroll {
  0% {
    transform: translate(0, 0) scale(1) rotate(0deg);
    opacity: 0;
  }
  50% {
    transform: translate(-5px, -5vh) scale(0.8) rotate(180deg);
    opacity: 0.5;
  }
  100% {
    transform: translate(5px, -10vh) scale(0.3) rotate(360deg);
    opacity: 0;
  }
}
.strong-icons {
  max-width: 64px;
  max-height: 64px;
  position: absolute;
  top: 50%;
  pointer-events: none;
  transform-origin: center;
  opacity: 0;
}
.strong-icons.fish-visible {
  animation: swimAcross 1s ease-in-out forwards;
}
@keyframes swimAcross {
  0% {
    left: -100%;
    transform: scaleX(1) scale(.1);
    opacity: .2;
  }
  50% {
    transform: scaleX(-1) scale(.5);
    opacity: .5;
  }
  100% {
    left: -6vw;
    transform: translateY(-50%) scaleX(-1) scale(2) ;
    opacity: 1;
  }
}
#calculate-btn:disabled {
    opacity: 0.1;
    pointer-events: none;
}