:root {
    --menu-button-bg: #2c2c2c; /* This will be the dark fill on hover/active */
    --menu-line-color-default: #2c2c2c; /* Dark lines by default */
    --menu-line-color-hover: #ffffff;   /* Light lines on hover/active */
    --nav-panel-bg: #1e1e1e;
    --text-color-primary: #ffffff;
    --text-color-secondary: #a0a0a0;
    --font-family: 'Inter', sans-serif;

    /* Viewport-based dimensions */
    --menu-button-size: clamp(45px, 12vw, 60px);
    --menu-line-width: clamp(18px, 4.5vw, 24px);
    --menu-line-height: clamp(1.5px, 0.4vw, 2px);
    --menu-button-hover-transition-duration: 0.3s; /* For color/bg changes */

    --nav-panel-width: clamp(280px, 85vw, 400px);
    --nav-padding: clamp(20px, 5vw, 30px);

    --dot-size: clamp(6px, 1.5vw, 8px);
    --dot-offset-left: clamp(-15px, -4vw, -20px);

    --transition-duration: 0.5s; /* For X transform & panel slide */
    --transition-easing: cubic-bezier(0.77, 0, 0.175, 1);
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}

.main-content {
    padding: var(--nav-padding);
    padding-top: calc(var(--menu-button-size) + var(--nav-padding) * 2);
}

/* --- Menu Toggle Button --- */
.menu-toggle {
    position: fixed;
    top: var(--nav-padding);
    right: var(--nav-padding);
    width: var(--menu-button-size);
    height: var(--menu-button-size);
    /* DEFAULT STATE */
    background-color: transparent; /* No fill by default */
    border: none; /* No border by default, fill will form the circle on hover */
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1001;
    padding: 0;
    overflow: hidden; /* Important for border-radius and magnetic effect */
    will-change: transform, background-color; /* Hint for animations */
    transition: background-color var(--menu-button-hover-transition-duration) ease;
}

.menu-toggle__line {
    display: block;
    width: var(--menu-line-width);
    height: var(--menu-line-height);
    /* DEFAULT STATE */
    background-color: var(--menu-line-color-default); /* Dark lines */
    transform-origin: center;
    position: absolute;
    transition: background-color var(--menu-button-hover-transition-duration) ease,
                transform var(--transition-duration) var(--transition-easing),
                opacity var(--transition-duration) var(--transition-easing);
}

.menu-toggle__line--1 {
    transform: translateY(calc(var(--menu-line-width) * -0.16));
}

.menu-toggle__line--2 {
    transform: translateY(calc(var(--menu-line-width) * 0.16));
}

/* HOVER STATE for Button Background and Line Color */
.menu-toggle:hover {
    background-color: var(--menu-button-bg); /* Dark circle fades in */
}
.menu-toggle:hover .menu-toggle__line {
    background-color: var(--menu-line-color-hover); /* Lines become light */
}

/* ACTIVE STATE (X icon) - Button Background and Line Color should persist like hover */
.menu-toggle.is-active {
    background-color: var(--menu-button-bg); /* Dark circle stays */
}
.menu-toggle.is-active .menu-toggle__line {
    background-color: var(--menu-line-color-hover); /* X lines are light */
}

/* ACTIVE STATE (X icon) - Line Transformations */
.menu-toggle.is-active .menu-toggle__line--1 {
    transform: rotate(45deg);
}
.menu-toggle.is-active .menu-toggle__line--2 {
    transform: rotate(-45deg);
}


/* --- Navigation Panel (styles from previous version remain the same) --- */
.nav-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--nav-panel-width);
    height: 100vh;
    background-color: var(--nav-panel-bg);
    color: var(--text-color-primary);
    transform: translateX(100%);
    transition: transform var(--transition-duration) var(--transition-easing);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: var(--nav-padding);
    padding-top: calc(var(--menu-button-size) + var(--nav-padding) * 1.5);
    will-change: transform;
}

.nav-panel.is-open {
    transform: translateX(0);
}

.nav-panel__content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.nav-panel__section-title {
    font-size: clamp(0.65rem, 2.5vw, 0.75rem);
    font-weight: 500;
    color: var(--text-color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: clamp(8px, 2vw, 10px);
}

.nav-panel__divider {
    border: none;
    height: 1px;
    background-color: var(--text-color-secondary);
    margin-bottom: clamp(20px, 5vw, 30px);
}

.nav-panel__links {
    list-style: none;
    margin-bottom: auto;
    position: relative;
}

.nav-dot {
    position: absolute;
    left: var(--dot-offset-left);
    width: var(--dot-size);
    height: var(--dot-size);
    background-color: var(--text-color-primary);
    border-radius: 50%;
    opacity: 0;
    will-change: top, opacity;
}

.nav-panel__links li {
    margin-bottom: clamp(10px, 2.5vw, 15px);
}

.nav-link {
    font-size: clamp(1.8rem, 8vw, 2.8rem);
    font-weight: 500;
    color: var(--text-color-primary);
    text-decoration: none;
    display: inline-block;
    position: relative;
    transition: color 0.3s ease;
    will-change: transform;
    -webkit-tap-highlight-color: transparent;
}
.nav-link:hover,
.nav-link.active-link {
    color: #b0b0b0;
}

.nav-panel__socials {
    margin-top: clamp(30px, 7vw, 40px);
}

.nav-panel__social-links {
    display: flex;
    flex-wrap: wrap;
    gap: clamp(15px, 3vw, 20px);
}

.social-link {
    font-size: clamp(0.75rem, 3vw, 0.9rem);
    font-weight: 500;
    color: var(--text-color-primary);
    text-decoration: none;
    display: inline-block;
    transition: color 0.3s ease;
    will-change: transform;
    -webkit-tap-highlight-color: transparent;
}
.social-link:hover {
    color: #bbb;
}