@import url(https://fonts.googleapis.com/css?family=Poppins:100,100italic,200,200italic,300,300italic,regular,italic,500,500italic,600,600italic,700,700italic,800,800italic,900,900italic);

:root {
    --background-light: #e8e8e8;
    --background-dark: #212121;
    --font-family: "Poppins";
    --font-color-light: #fff;
    --font-color-dark: #333;
    --button-bg-dark: rgba(0, 0, 0, 0.4);
    --button-bg-light: rgba(255, 255, 255, 0.4);
    --button-bg-accent: #2c5d9a;
    --button-size: 60px;
    --button-gap: 15px;
    --padding: 25px;
    --blue-background: #4169E1;
    --button-bg-normal: rgb(31, 165, 228);
    --new-background: #010B13;
    --light-blue-background: #BDD8E9;
    --box-shadow-for-dark: 20px 20px 5px var(--button-bg-dark);
    --box-shadow-for-light: 30px 50px 50px var(--button-bg-dark);
    --border-light: none;
    --border-normal: 1px solid rgba(255, 255, 255, 0.3);
    --scientific-buttons-width: calc((var(--button-size) + var(--button-gap)) * 5 - var(--button-gap));
    --programming-buttons-width: calc((var(--button-size) + var(--button-gap)) * 4 - var(--button-gap));
    --normal-buttons-width: calc((var(--button-size) + var(--button-gap)) * 5 - var(--button-gap));
    --normal-calc-width: calc(var(--normal-buttons-width) + var(--padding) * 2);
    --scientific-calc-width: calc(var(--scientific-buttons-width) + var(--normal-buttons-width) + var(--button-gap) + var(--padding) * 2);
    --programming-calc-width: calc(var(--programming-buttons-width) + var(--normal-buttons-width) + var(--button-gap) + var(--padding) * 3);
    --menu-width: 350px;
    --secondary-color: #3a3f44;
    --text-color: #fff;
    --primary-color: #BDD8E9;
    --font-color-new: #7d7d7d;
    --button-bg-new: #2e2e2e;
    --new-body-background: #000000;
    --box-shadow-for-new: #7d7d7d;
    --border-new: #4b4b4b;
}

body {
    background-color: var(--blue-background);
    font-family: var(--font-family);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100svh;
    margin: 0;
    overflow: hidden;
}

h1 {
    text-align: center;
    padding-top: 10rem;
    position: absolute;
    top: 1%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
}

a {
    text-decoration: none;
    color: #fff;
}

main {
    position: relative;
}

.main-content {
    display: flex;
    flex-direction: row-reverse;
    background: rgba(26, 43, 45, 0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    width: var(--normal-calc-width);
    height: 480px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.5), inset 0 -1px 0 rgba(255, 255, 255, 0.1);
    z-index: 1;
    overflow: hidden;
    position: relative;
    transition: width 0.5s cubic-bezier(0.86, 0, 0.07, 1);
    margin: 0;
    box-shadow: 20px 20px 5px var(--button-bg-dark);
}

.main-content.active {
    width: calc(var(--normal-calc-width) + var(--menu-width) + 5rem);
}

.main-content.scientific-mode {
    width: var(--scientific-calc-width);
}

.main-content.scientific-mode.active {
    width: calc(var(--scientific-calc-width) + var(--menu-width));
}

.main-content.programming-mode {
    width: var(--programming-calc-width);
    padding-right: 2.5rem;
}

.main-content.programming-mode.active {
    width: calc(var(--programming-calc-width) + var(--menu-width));
    padding-right: 3rem;
}

.menu-panel {
    /* width: var(--menu-width); */
    width: 60%;
    flex-shrink: 0;
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
    overflow: hidden;
    padding: 0;
    position: relative;
    transition: transform 0.5s cubic-bezier(0.86, 0, 0.07, 1), opacity 0.5s cubic-bezier(0.86, 0, 0.07, 1);
    color: var(--font-color-light);
    display: flex; /* Used for centering active panels */
    flex-direction: column;
}

.menu-panel.active {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}

/* --- REVISED STYLES FOR MENU PANELS --- */

.menu-content,
.history-content,
.converters-content {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    padding-top: 6rem;
    box-sizing: border-box;
    transition: opacity 0.5s cubic-bezier(0.86, 0, 0.07, 1);
    
    /* We hide using opacity/pointer-events so that Smooth Scrollbar can initialize */
    opacity: 0;
    pointer-events: none;
    display: flex; 
}

/* Active panel */
.menu-content.active-panel,
.history-content.active-panel,
.converters-content.active-panel {
    opacity: 1;
    pointer-events: auto;
    position: relative;
    /* 🔑 KEY: Ensure the active panel takes up the full available height */
    height: 100%; 
}

/* Maintain specific styles for history-content layout */
.history-content {
    /* 🔑 KEY CHANGE: Enable Flexbox */
    display: flex; 
    flex-direction: column;
    padding: 20px;
    padding-top: 3rem; /* Overwrites the default padding-top from above for better fit */
}

/* --- END OF REVISED STYLES FOR MENU PANELS --- */

.menu-content h3,
.converters-content h4 {
    margin-top: 1rem;
    margin-left: 2rem;
}
.menu-content h3 {
    transform: translateX(9rem) translateY(-2rem);
}
.calculator-body {
    width: var(--normal-calc-width);
    flex-shrink: 0;
    transition: width 0.5s cubic-bezier(0.86, 0, 0.07, 1);
    padding: var(--padding);
    box-sizing: border-box;
    display: grid;
    grid-template-rows: 20% 1fr;
}

.calculator-body.scientific-mode {
    width: var(--scientific-calc-width);
}

.calculator-body.programming-mode {
    width: var(--programming-calc-width);
}

.calculator-body.section-visible {
    display: grid;
}

.converter-mode-body.section-visible {
    display: flex;
}

/* Use a general rule for hiding, but ensure it's not display: none forcefully */
.calculator-body:not(.section-visible),
.converter-mode-body:not(.section-visible),
.date-calculator-body:not(.section-visible) {
    display: none !important;
}

#input {
    width: 100%;
    text-align: right;
    font-size: 2.5rem;
    background-color: transparent;
    color: white;
    border: none;
    outline: none;
    box-sizing: border-box;
    padding: 25px 25px;
    word-break: break-all;
}

#input::placeholder {
    color: white;
    opacity: 1;
}

#result {
    width: 100%;
    text-align: right;
    font-size: 2rem;
    color: var(--font-color-light);
    padding: 10px 0px;
    transform: translateY(-1rem) translateX(-1rem);
    opacity: 0.5;
    word-break: break-all;
}

.buttons-container {
    display: flex;
    flex-direction: row-reverse;
    gap: var(--button-gap);
    height: 380px;
    transition: transform 0.5s cubic-bezier(0.86, 0, 0.07, 1);
}

.scientific-buttons,
.programming-buttons {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    gap: var(--button-gap);
    width: 0;
    opacity: 0;
    pointer-events: none;
    transition: width 0.5s cubic-bezier(0.86, 0, 0.07, 1), opacity 0.5s cubic-bezier(0.86, 0, 0.07, 1);
    flex-shrink: 0;
    overflow: hidden;
    height: 90%;
    justify-content: flex-start;
    align-content: flex-start;
}

.normal-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--button-gap);
    width: var(--normal-buttons-width);
    transition: width 0.5s cubic-bezier(0.86, 0, 0.07, 1);
}

.calculator-body.scientific-mode .scientific-buttons {
    width: var(--scientific-buttons-width);
    opacity: 1;
    pointer-events: auto;
}

.calculator-body.scientific-mode .normal-buttons {
    margin-right: var(--button-gap);
}

.calculator-body.programming-mode .programming-buttons {
    width: var(--programming-buttons-width);
    opacity: 1;
    pointer-events: auto;
}

.calculator-body.programming-mode .normal-buttons {
    margin-right: var(--button-gap);
}

.normal-buttons .row,
.scientific-buttons .row,
.programming-buttons .row {
    display: flex;
    gap: var(--button-gap);
    justify-content: space-between;
}

.buttons-container button {
    height: var(--button-size);
    font-size: 1.4rem;
    border: none;
    outline: none;
    border-radius: 25px;
    cursor: pointer;
    transition: background-color 0.2s;
    white-space: nowrap;
    box-sizing: border-box;
}

.normal-buttons .row button {
    width: var(--button-size);
}

.scientific-buttons button,
.programming-buttons button {
    width: var(--button-size);
}

.normal-buttons .row:last-child button:nth-child(2) {
    width: var(--button-size);
}

.number-button {
    background: var(--button-bg-dark);
    color: var(--font-color-light);
}

.special-button {
    background-color: var(--button-bg-light);
    color: var(--font-color-light);
}

.special-button.active-mode {
    background-color: var(--button-bg-accent);
}

.equals-button {
    background-color: var(--button-bg-accent);
    color: var(--font-color-light);
}

.main-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
}

.hamburger-menu {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 3;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

.hamburger-icon,
.back-icon {
    cursor: pointer;
    padding: 10px;
    position: absolute;
    top: 0;
    left: 0;
    transition: opacity 0.3s, visibility 0.3s;
}

.back-icon {
    opacity: 0;
    visibility: hidden;
}

.hamburger-icon {
    opacity: 1;
    visibility: visible;
}

.main-content.scientific-mode .back-icon,
.main-content.programming-mode .back-icon,
.main-content.active .back-icon,
.main-content.converter-mode .back-icon {
    opacity: 1;
    visibility: visible;
}

.main-content.scientific-mode .hamburger-icon,
.main-content.programming-mode .hamburger-icon,
.main-content.active .hamburger-icon,
.main-content.converter-mode .hamburger-icon {
    opacity: 0;
    visibility: hidden;
}

.hamburger-icon span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--font-color-light);
    margin: 5px 0;
    transition: 0.4s;
    border-radius: 3px;
    transition: width 0.2s ease-out, transform 0.3s ease-out;
}

.hamburger-icon.clicked span {
    transform: scaleX(0.3) scaleY(0.9);
}

.menu-items {
    list-style: none;
    display: inline-block;
    transform: translateX(-4rem) translateY(2.5rem);
    overflow-y: auto;
    height: 100%;
    box-sizing: border-box;
    width: 100%;
}

.menu-items li:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.menu-items li img,
.menu-items li i {
    width: 25px;
    height: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
}

.menu-items li {
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
    padding: 10px 15px;
    border-radius: 5px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
    width: 15rem;
}

.menu-items li a {
    color: var(--font-color-light);
    text-decoration: none;
    margin-left: 0;
    width: 15rem;
}

/* --- Calculation History Section --- */
.history-title {
    text-align: center;
    margin-top: 0;
}

.history-list-container {
    /* 🔑 KEY: Fills the vertical space in .history-content (which is now flex) */
    flex-grow: 1;
    padding-right: 15px;
    /* Force 100% height in the flex context so Smooth Scrollbar knows the boundaries */
    height: 100%;
    min-height: 0; /* Allows shrinking in flexbox */
    overflow-y: hidden; /* Scroll control via Smooth Scrollbar */
    transform: translateY(-1rem);
}

/* Hiding the default smooth-scrollbar scrollbar (Webkit and Firefox bars are removed in a separate block below, if defined) */
.history-list-container .scrollbar-track {
    display: none !important;
}

#history-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

#history-list li {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 10px 15px;
    margin-bottom: 10px;
    transition: all 0.35s ease-in-out;
    opacity: 0;
    transform: scale(0.7);
}

#history-list li.item-focus,
#history-list li.item-next {
    opacity: 1;
    transform: scale(1);
}

#history-list li.item-hide {
    opacity: 0;
    transform: scale(0.7);
}

#history-list li .expression {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    word-break: break-all;
}

#history-list li .result {
    font-size: 1.5rem;
    font-weight: bold;
    word-break: break-all;
}

#clear-history-btn {
    margin-top: 20px;
    background: var(--button-bg-accent);
    color: var(--font-color-light);
    font-size: 1.2rem;
    border-radius: 10px;
    cursor: pointer;
    height: 4rem;
    width: 200px;
    padding: 15px 20px;
    align-self: center;
    flex-shrink: 0; /* Prevents button from shrinking */
    border: none;
    outline: none;
    transform: translateX(1rem);
}
/* --- End of Calculation History Section --- */


/* Converter: Menu Section */
.converter-content {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    padding-top: 6rem;
    box-sizing: border-box;
    transition: opacity 0.5s cubic-bezier(0.86, 0, 0.07, 1);
    display: flex;
    flex-direction: column;
    color: var(--font-color-light);
    padding: 20px;
    opacity: 0; 
    pointer-events: none;
}

.converter-content.active-panel {
    opacity: 1;
    pointer-events: auto;
    position: relative;
}

.converters-title {
    text-align: center;
    transform: translateY(2rem);
    margin-bottom: 0;
    margin-top: 2rem;
}

.converters-list {
    list-style: none;
    padding: 0;
    margin: 0;
    transform: translateY(4rem) translateX(7rem);
    display: inline-block;
    margin-top: 2rem;
}

.converters-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
    padding: 10px 15px;
    border-radius: 5px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}

.converters-list li:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.converters-list li a {
    color: var(--font-color-light);
    text-decoration: none;
}

/* Converter: Main Section */
.converter-mode-body {
    width: 100%;
    height: 100%;
    position: absolute;
    padding: var(--padding);
    box-sizing: border-box;
    flex-direction: column;
}

.converter-mode-body.section-visible {
    display: flex;
}

/* Other converter-specific rules (from przeliczniki.css) */

.converter-currency-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    max-width: 400px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.currency-group {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: var(--secondary-color);
    padding: 10px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.currency-select {
    border: none;
    background-color: transparent;
    color: var(--text-color);
    font-size: 1em;
    padding: 5px;
    cursor: pointer;
    border-left: 1px solid var(--primary-color);
}

.currency-select option {
    background-color: var(--secondary-color);
    color: var(--text-color);
}

/* Visibility switching rules (modified for consistency) */

.section-visible {
    display: grid !important; 
}

.section-visible.converter-mode-body {
    display: flex !important;
}

.section-hidden {
    display: none !important;
}
.menu-items.scientific-active {
    transform: translateX(11rem) translateY(2rem);
}
.menu-content.scientific-active h3 {
    transform: translateX(24rem) translateY(-2rem);
}
.menu-content.programming-active {
    transform: translateX(15rem);
}