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

:root {
    /* Dark theme (default) */
    background-color: #1c1c1c;
    --text-primary: rgba(255, 255, 255, 0.9);
    --text-secondary: rgba(255, 255, 255, 0.7);
    --control-bg: rgba(255, 255, 255, 0.1);
    --control-border: rgba(255, 255, 255, 0.2);
    --control-hover-bg: rgba(255, 255, 255, 0.15);
    --control-hover-border: rgba(255, 255, 255, 0.4);
    --status-bg: rgba(255, 255, 255, 0.1);
    --status-border: rgba(255, 255, 255, 0.2);
    --theme-btn-bg: rgba(255, 255, 255, 0.15);
    --theme-btn-hover: rgba(0, 0, 0, 0.25);
    
    /* Button colors for dark theme */
    --btn-bg: #ffffff;
    --btn-text: #000000;
    --btn-border: rgba(255, 255, 255, 0.5);
    --btn-active-bg: #000000;
    --btn-active-text: #ffffff;
    --btn-active-border: rgba(255, 255, 255, 0.5);
    --btn-shadow: rgba(0, 0, 0, 0.3);
    --btn-shadow-strong: rgba(0, 0, 0, 0.5);
}

body[data-theme="light"] {
    /* Light theme */
    background-color: #ffffff;
    --text-primary: rgba(0, 0, 0, 0.9);
    --text-secondary: rgba(0, 0, 0, 0.7);
    --control-bg: rgba(0, 0, 0, 0.08);
    --control-border: rgba(0, 0, 0, 0.15);
    --control-hover-bg: rgba(0, 0, 0, 0.12);
    --control-hover-border: rgba(0, 0, 0, 0.3);
    --status-bg: rgba(0, 0, 0, 0.05);
    --status-border: rgba(0, 0, 0, 0.15);
    --theme-btn-bg: rgba(0, 0, 0, 0.08);
    --theme-btn-hover: rgba(0, 0, 0, 0.15);
    
    /* Button colors for light theme */
    --btn-bg: #000000;
    --btn-text: #ffffff;
    --btn-border: rgba(0, 0, 0, 0.5);
    --btn-active-bg: #ffffff;
    --btn-active-text: #000000;
    --btn-active-border: rgba(0, 0, 0, 0.3);
    --btn-shadow: rgba(0, 0, 0, 0.1);
    --btn-shadow-strong: rgba(0, 0, 0, 0.2);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 50%, var(--bg-gradient-end) 100%);
    transition: background 0.3s ease;
}

#container {
    position: relative;
    width: 100vw;
    height: 100vh;
}

#canvas {
    position: absolute;
    top: -100px;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.theme-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--theme-btn-bg);
    border: 2px solid var(--control-border);
    backdrop-filter: blur(10px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 22px;
    position: relative;
}

.theme-btn:hover {
    background: var(--theme-btn-hover);
    border-color: var(--control-hover-border);
    transform: scale(1.05);
}

.theme-btn:active {
    transform: scale(0.95);
}

.theme-btn .sun-icon,
.theme-btn .moon-icon {
    position: absolute;
    transition: all 0.3s ease;
}

.theme-btn .sun-icon {
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
}

.theme-btn .moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

body[data-theme="light"] .theme-btn .sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

body[data-theme="light"] .theme-btn .moon-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}

#controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width:100%;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    pointer-events: none;
}

#startBtn {
    pointer-events: all;
    padding: 16px 48px;
    font-size: 18px;
    font-weight: 600;
    color: var(--btn-text);
    background: var(--btn-bg);
    border: 2px solid var(--btn-border);
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 10px 30px var(--btn-shadow);
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#startBtn:hover {
    box-shadow: 0 15px 40px var(--btn-shadow-strong);
    transform: scale(1.02);
}

#startBtn:active {
    box-shadow: 0 10px 25px var(--btn-shadow);
    transform: scale(0.98);
}

#startBtn.active {
    background: var(--btn-active-bg);
    color: var(--btn-active-text);
    border-color: var(--btn-active-border);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 10px 30px var(--btn-shadow);
    }
    50% {
        box-shadow: 0 10px 50px var(--btn-shadow-strong);
    }
}

#status {
    color: var(--text-secondary);
    font-size: 14px;
    text-align: center;
    padding: 12px 24px;
    background: var(--status-bg);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid var(--status-border);
}

#status.active {
    color: var(--text-primary);
    border-color: var(--control-hover-border);
    background: var(--control-hover-bg);
    font-weight: 600;
}

#stateControls {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.control-label {
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.state-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.state-btn {
    pointer-events: all;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--control-bg);
    border: 2px solid var(--control-border);
    border-radius: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    min-width: 80px;
}

.state-btn .icon {
    font-size: 24px;
}

.state-btn:hover {
    background: var(--control-hover-bg);
    border-color: var(--control-hover-border);
    transform: translateY(-2px);
}

.state-btn.active {
    color: var(--btn-active-text);
    border-width: 2px;
    background: var(--btn-active-bg);
    border-color: var(--btn-active-border);
    box-shadow: 0 5px 20px var(--btn-shadow);
}

.state-btn[data-state="idle"].active {
    background: var(--btn-active-bg);
    border-color: var(--btn-active-border);
}

.state-btn[data-state="listening"].active {
    background: var(--btn-active-bg);
    border-color: var(--btn-active-border);
}

.state-btn[data-state="thinking"].active {
    background: var(--btn-active-bg);
    border-color: var(--btn-active-border);
}

.state-btn[data-state="speaking"].active {
    background: var(--btn-bg);
    color: var(--btn-text);
    border-color: var(--btn-border);
    box-shadow: 0 5px 20px var(--btn-shadow-strong);
    animation: pulse 1.5s infinite;
}