:root {
    --bg-color: #000000;
    --text-color: #ffffff;
    --accent-color: #ffffff;
    --container-bg: #000000;
    --menu-bg: rgba(20, 20, 20, 0.95);
    --menu-border: rgba(255, 255, 255, 0.2);
    --button-hover: rgba(255, 255, 255, 0.1);
    --button-active: rgba(255, 255, 255, 0.9);
    --button-active-text: #000000;
}

body.light-mode {
    --bg-color: #f5f5f5;
    --text-color: #1a1a1a;
    --accent-color: #2c3e50;
    --container-bg: #ffffff;
    --menu-bg: rgba(255, 255, 255, 0.95);
    --menu-border: rgba(0, 0, 0, 0.1);
    --button-hover: rgba(0, 0, 0, 0.05);
    --button-active: #2c3e50;
    --button-active-text: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--container-bg);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    overflow: hidden;
    /* Prevent scrolling */
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

.subtitle {
    color: #ccc;
    margin-top: 0;
}

/* Hamburger Menu Container */
.menu-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.menu-toggle {
    width: 50px;
    height: 50px;
    background: transparent;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: all 0.3s ease;
    padding: 0;
    opacity: 0.3;
}

.menu-toggle:hover {
    opacity: 1;
    transform: scale(1.05);
}

.menu-toggle.active {
    opacity: 1;
    background: var(--menu-bg);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.hamburger-line {
    width: 24px;
    height: 2.5px;
    background-color: var(--text-color);
    border-radius: 2px;
    transition: all 0.3s ease;
    opacity: 0.8;
}

.menu-toggle:hover .hamburger-line {
    opacity: 1;
}

.menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* Menu Dropdown */
.menu-dropdown {
    position: absolute;
    top: 60px;
    right: 0;
    background: var(--menu-bg);
    border: 1px solid var(--menu-border);
    border-radius: 12px;
    padding: 16px;
    min-width: 280px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.menu-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.menu-section {
    padding: 8px 0;
}

.menu-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
    opacity: 0.7;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.term-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.term-btn {
    padding: 10px;
    background: transparent;
    border: 1px solid var(--menu-border);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.term-btn:hover {
    background: var(--button-hover);
    transform: translateY(-2px);
}

.term-btn.active {
    background: var(--button-active);
    color: var(--button-active-text);
    border-color: var(--button-active);
    font-weight: 600;
}

.menu-divider {
    height: 1px;
    background: var(--menu-border);
    margin: 12px 0;
}

/* Theme Toggle */
.theme-toggle-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 4px;
}

.theme-label {
    font-size: 0.95rem;
    color: var(--text-color);
    font-weight: 500;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.2);
    transition: 0.3s;
    border-radius: 26px;
    border: 1px solid var(--menu-border);
}

.theme-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-color);
    transition: 0.3s;
    border-radius: 50%;
}

.theme-switch input:checked + .theme-slider {
    background-color: var(--button-active);
}

.theme-switch input:checked + .theme-slider:before {
    transform: translateX(24px);
}

/* Legacy controls (hidden, kept for compatibility) */
.controls {
    display: none;
}

.status {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.6;
    margin-top: 1rem;
    font-style: italic;
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    transition: opacity 0.3s ease;
}

#word-cloud-container {
    width: 100vw;
    height: 100vh;
    background-color: var(--container-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

#loading {
    font-size: 1.5rem;
    color: var(--text-color);
    animation: pulse 1.5s infinite;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@keyframes pulse {
    0% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0.6;
    }
}

footer {
    margin-top: 2rem;
    font-size: 0.8rem;
    color: #aaa;
}

/* Word Cloud Text Styles */
text {
    cursor: pointer;
    transition: all 0.3s ease;
    /* fill is set by JS now */
}

text:hover {
    opacity: 0.7;
    filter: brightness(1.2);
}

body.light-mode text:hover {
    opacity: 0.7;
    filter: brightness(0.8);
}

/* Physics mode text styles */
text.physics-dragging {
    cursor: grabbing !important;
}