:root {
    /* Material You colors - Hot Pink Theme */
    --primary-color: #E91E63;
    --primary-light: #F8BBD0;
    --primary-dark: #C2185B;
    --accent-color: #FF4081;
    
    --surface-color: #121212;
    --background-color: #0A0A0A;
    --card-background: #1E1E1E;
    --elevated-surface: #242424;
    
    --on-primary: #FFFFFF;
    --on-surface: #E1E1E1;
    --on-surface-medium: #AEAEAE;
    --on-surface-disabled: #666666;
    
    --ripple-color: rgba(233, 30, 99, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.3);
    
    /* Typography */
    --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
    
    /* Elevation */
    --elevation-1: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --elevation-2: 0 3px 6px rgba(0, 0, 0, 0.15), 0 2px 4px rgba(0, 0, 0, 0.12);
    --elevation-3: 0 10px 20px rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.1);
    --elevation-4: 0 15px 25px rgba(0, 0, 0, 0.15), 0 5px 10px rgba(0, 0, 0, 0.05);
    
    /* Layout */
    --header-height: 64px;
    --content-max-width: 1200px;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--on-surface);
    line-height: 1.5;
    min-height: 100vh;
    overscroll-behavior: none;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ===== Header ===== */
.app-header {
    background-color: var(--surface-color);
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: var(--elevation-2);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo span {
    color: var(--primary-color);
    font-size: 28px;
}

.logo h1 {
    font-size: 20px;
    font-weight: 500;
    color: var(--on-surface);
}

.room-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.room-code-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--elevated-surface);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-lg);
}

.copy-code-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background-color: var(--primary-dark);
    color: var(--on-primary);
    border: none;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.copy-code-button:hover {
    background-color: var(--primary-color);
}

.copy-code-button .material-symbols-rounded {
    font-size: 16px;
}

.room-label {
    font-size: 14px;
    color: var(--on-surface-medium);
}

.room-code {
    font-weight: 500;
    letter-spacing: 1px;
}

.room-status {
    font-size: 14px;
    color: var(--on-surface-medium);
}

/* ===== Welcome Screen ===== */
.app-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.welcome-screen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.welcome-card {
    background-color: var(--card-background);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--elevation-3);
    padding: var(--spacing-lg);
    width: 100%;
    max-width: 800px;
}

.welcome-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.welcome-header span {
    color: var(--primary-color);
    font-size: 36px;
}

.welcome-header h2 {
    font-size: 24px;
    font-weight: 500;
}

.welcome-card > p {
    color: var(--on-surface-medium);
    margin-bottom: var(--spacing-lg);
}

.welcome-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.action-card {
    background-color: var(--elevated-surface);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.action-card h3 {
    font-size: 18px;
    font-weight: 500;
}

.action-card p {
    color: var(--on-surface-medium);
    font-size: 14px;
    margin-bottom: var(--spacing-sm);
}

.join-input-container {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===== Video Room ===== */
.video-room {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    max-width: var(--content-max-width);
    margin: 0 auto;
    width: 100%;
}

.video-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.video-wrapper {
    position: relative;
    background-color: black;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    aspect-ratio: 16/9;
}

video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.video-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    padding: var(--spacing-md);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.video-wrapper:hover .video-controls,
.video-controls:focus-within {
    opacity: 1;
}

.progress-bar-container {
    margin-bottom: var(--spacing-sm);
}

.progress-bar {
    height: 4px;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
}

.progress-filled {
    background-color: var(--primary-color);
    height: 100%;
    width: 0;
    border-radius: 2px;
    position: absolute;
    top: 0;
    left: 0;
}

.control-buttons {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.control-button {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color var(--transition-fast);
}

.control-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.right-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.time-display {
    font-size: 14px;
    color: white;
    margin: 0 var(--spacing-md);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

#volumeSlider {
    width: 80px;
    height: 4px;
    -webkit-appearance: none;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
}

#volumeSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: white;
    cursor: pointer;
}

.video-input-container {
    background-color: var(--card-background);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.url-input-wrapper,
.subtitle-input-wrapper,
.combined-input-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.input-group label {
    color: var(--primary-light);
    font-size: 14px;
    font-weight: 500;
}

.subtitle-inputs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.or-divider {
    color: var(--on-surface-medium);
    font-size: 12px;
    text-align: center;
    margin: 4px 0;
}

.file-input {
    display: none;
}

.file-input-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--primary-color);
    background-color: var(--ripple-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.file-input-label:hover {
    background-color: rgba(233, 30, 99, 0.2);
}

/* ===== Chat Container ===== */
.chat-container {
    background-color: var(--card-background);
    border-radius: var(--border-radius-md);
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--header-height) - 2 * var(--spacing-md));
}

.chat-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--elevated-surface);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h3 {
    font-size: 16px;
    font-weight: 500;
}

.sync-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.connected-users {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--elevated-surface);
    max-height: 150px;
    overflow-y: auto;
}

.user-list-header {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
}

.user-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.user-item {
    background-color: var(--ripple-color);
    color: var(--primary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-md);
    font-size: 12px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.user-item.host {
    background-color: var(--primary-dark);
    color: var(--on-primary);
}

.user-item .material-symbols-rounded {
    font-size: 14px;
}

.chat-messages {
    flex: 1;
    padding: var(--spacing-sm);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.chat-message {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    max-width: 85%;
    word-break: break-word;
}

.chat-message.outgoing {
    background-color: var(--primary-dark);
    color: var(--on-primary);
    align-self: flex-end;
}

.chat-message.incoming {
    background-color: var(--elevated-surface);
    color: var(--on-surface);
    align-self: flex-start;
}

.chat-sender {
    font-size: 12px;
    opacity: 0.8;
    font-weight: 500;
    margin-bottom: 2px;
}

.chat-input-container {
    padding: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    border-top: 1px solid var(--elevated-surface);
}

/* ===== Inputs & Buttons ===== */
.text-input {
    background-color: var(--elevated-surface);
    border: 1px solid transparent;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--on-surface);
    font-family: var(--font-family);
    flex: 1;
    transition: border-color var(--transition-fast);
}

.text-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.primary-button {
    background-color: var(--primary-color);
    color: var(--on-primary);
    border: none;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-family);
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.primary-button:hover {
    background-color: var(--primary-dark);
}

.secondary-button {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-family);
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.secondary-button:hover {
    background-color: var(--ripple-color);
}

.icon-button {
    background-color: transparent;
    border: none;
    color: var(--on-surface);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.icon-button:hover {
    background-color: var(--ripple-color);
}

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--elevated-surface);
    color: var(--on-surface);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--elevation-2);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
}

/* ===== Chat Notification Bubbles ===== */
.chat-notification-bubble {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background-color: var(--primary-dark);
    color: var(--on-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--elevation-3);
    max-width: 280px;
    z-index: 9999;
    transform: translateX(120%);
    transition: transform var(--transition-normal);
    cursor: pointer;
}

.chat-notification-bubble.visible {
    transform: translateX(0);
}

.notification-sender {
    font-weight: 500;
    margin-bottom: 4px;
}

.notification-preview {
    font-size: 14px;
    opacity: 0.9;
}

/* ===== Media Queries ===== */
@media (max-width: 900px) {
    .video-room {
        grid-template-columns: 1fr;
    }
    
    .welcome-actions {
        grid-template-columns: 1fr;
    }
    
    .app-header {
        padding: 0 var(--spacing-md);
        flex-direction: column;
        height: auto;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
    }
    
    .logo h1 {
        font-size: 18px;
    }
}

@media (max-width: 600px) {
    .url-input-wrapper,
    .subtitle-input-wrapper,
    .combined-input-wrapper {
        flex-direction: column;
    }
    
    .chat-container {
        height: 400px;
    }
}