:root {
    --bg-dark: #0f172a;
    --bg-glass: rgba(30, 41, 59, 0.7);
    --border-glass: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

html {
    overflow-y: scroll;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem 1rem 4rem 1rem; /* 4rem explicit bottom margin fallback */
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15), transparent 25%);
    overflow-x: hidden;
    /* REmoved display: flex to prevent Flexbox bottom-margin truncation bug */
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto; /* native block centering */
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

#setup-view {
    max-width: 600px;
    margin: 4rem auto;
    width: 100%;
}

header {
    text-align: center;
}

h1 {
    font-size: 3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.brand-wordmark {
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.brand-wordmark > span {
    display: inline-block;
}

.brand-ripple {
    width: 0.82em;
    height: 0.82em;
    margin: 0.04em 0.015em 0;
    flex: 0 0 auto;
    overflow: visible;
}

.brand-ripple-outer,
.brand-ripple-inner,
.brand-ripple-pulse {
    fill: none;
    stroke: url(#chorus-ripple-gradient);
    transform-box: fill-box;
    transform-origin: center;
}

.brand-ripple-outer {
    stroke-width: 9;
}

.brand-ripple-inner {
    stroke-width: 6;
    opacity: 0.72;
}

.brand-ripple-core {
    fill: url(#chorus-ripple-gradient);
}

.brand-ripple-pulse {
    stroke-width: 4;
    opacity: 0;
    animation: chorusRipple 3.8s ease-out infinite;
}

@keyframes chorusRipple {
    0%, 58% {
        opacity: 0;
        transform: scale(0.72);
    }
    64% {
        opacity: 0.35;
    }
    100% {
        opacity: 0;
        transform: scale(1.38);
    }
}

@media (prefers-reduced-motion: reduce) {
    .brand-ripple-pulse {
        animation: none;
    }
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.card h2 {
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.row-group {
    flex-direction: row;
}

input {
    width: 100%;
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-glass);
    background: rgba(15, 23, 42, 0.5);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

input:focus {
    border-color: var(--accent);
}

button {
    width: 100%;
    padding: 1rem;
    border-radius: 12px;
    border: none;
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:active {
    transform: scale(0.98);
}

button:disabled {
    cursor: wait;
    opacity: 0.65;
}

.primary-btn {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.primary-btn:hover {
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.secondary-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
}
.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.room-info {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.room-info h3 {
    min-width: 0;
    overflow-wrap: anywhere;
}

.status-indicator {
    width: 10px;
    height: 10px;
    background-color: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 10px #10b981;
}

.badge {
    margin-left: auto;
    padding: 0.3rem 0.8rem;
    background: var(--gradient);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    border-radius: 12px;
    overflow: hidden;
    background: #000;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-glass);
}

.video-container iframe,
.video-container #player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: auto;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    padding-bottom: 10px;
}

.overlay p {
    background: rgba(0,0,0,0.6);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    opacity: 0.8;
}

#host-controls button {
    width: auto;
    white-space: nowrap;
}

.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    padding: 1rem 2rem;
    border-radius: 30px;
    backdrop-filter: blur(10px);
    z-index: 100;
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.toast.hide {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

/* ========== NEW 3 COLUMN LAYOUT ========== */

.app-layout {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr) 300px;
    gap: 1.5rem;
    width: 100%;
    /* Revert to auto height to fix cutoff, allow page scroll natively */
    height: auto; 
    min-height: 500px;
}

.sidebar {
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    height: 100%;
    overflow: hidden;
}

#main-player-area {
    min-width: 0; 
}

.sidebar-header {
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h3 {
    font-size: 1.1rem;
    font-weight: 400;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-header .badge {
    margin: 0;
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
}

.styled-list {
    list-style: none;
    overflow-y: auto;
    flex-grow: 1;
    min-height: 0; /* MAGIC FLEXBOX BUG FIX */
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding-right: 5px;
}

.styled-list::-webkit-scrollbar { width: 4px; }
.styled-list::-webkit-scrollbar-track { background: transparent; }
.styled-list::-webkit-scrollbar-thumb { background: var(--border-glass); border-radius: 4px; }

/* Participants */
.participant-item {
    display: flex;
    align-items: center;
    background: rgba(15, 23, 42, 0.4);
    padding: 0.8rem;
    border-radius: 12px;
    border: 1px solid var(--border-glass);
    gap: 12px;
    animation: slideIn 0.3s ease;
}

.participant-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 600;
    font-size: 1rem;
    flex-shrink: 0;
}

.participant-info {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    overflow: hidden;
}

.participant-name {
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.participant-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    gap: 8px;
    margin-top: 3px;
}

/* Chat */
.chat-list {
    gap: 1rem;
}

.chat-message {
    display: flex;
    flex-direction: column;
    animation: slideIn 0.3s ease;
}

.chat-sender-info {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 0.3rem;
    margin-left: 0.5rem;
}

.chat-message.self .chat-sender-info {
    justify-content: flex-end;
    margin-right: 0.5rem;
    margin-left: 0;
}

.chat-sender {
    font-size: 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
}

.chat-timestamp {
    font-size: 0.65rem;
    color: rgba(148, 163, 184, 0.6);
}

.chat-bubble {
    background: rgba(255, 255, 255, 0.15);
    padding: 0.6rem 0.85rem;
    border-radius: 16px;
    border-bottom-left-radius: 4px;
    font-size: 0.9rem;
    width: fit-content;
    max-width: 95%;
    word-wrap: break-word;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.chat-message.self {
    align-items: flex-end;
}
.chat-message.self .chat-sender {
    display: none;
}
.chat-message.self .chat-bubble {
    background: var(--gradient);
    border-bottom-left-radius: 16px;
    border-bottom-right-radius: 4px;
    border: none;
}

.chat-input-area {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-glass);
}

.chat-input-area input {
    margin-bottom: 0px;
    padding: 0.8rem;
}
.chat-input-area button {
    width: 70px;
    padding: 0.8rem;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== THEATER MODE ========== */
@media (min-width: 1001px) {
    /* Safe container for 100vh locking */
    body.theater-active {
        padding: 1.5rem !important; /* 1.5rem permanent padding all the way around */
        height: 100vh;
        overflow: hidden !important; 
    }

    .container.theater-mode {
        max-width: 100%;
        margin: 0; 
        height: 100%; /* Perfectly consumed 100% of height minus the body padding */
    }

    .container.theater-mode #main-header {
        display: none;
    }

    .container.theater-mode .app-layout {
        grid-template-columns: minmax(0, 1fr) 300px; 
        height: 100%;     /* Fills container safely */
        min-height: 0;    /* allow shrink without blowout */
        margin: 0;
    }

    .container.theater-mode #main-player-area {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        padding: 1.5rem;
    }

    .container.theater-mode .room-info {
        width: 100%;
    }

    .container.theater-mode #host-controls {
        display: none !important;
    }

    .container.theater-mode .video-container {
        padding-bottom: 0;
        flex-grow: 1; /* Dynamically fill remaining space safely */
        height: auto;
        min-height: 0; /* Magic flex shrink */
        width: 100%; 
        max-width: 100%;
        max-height: 100%;
        aspect-ratio: 16 / 9;
        margin: 0 auto;
        object-fit: contain;
    }

    .container.theater-mode #participants-sidebar {
        display: none;
    }

    .container.theater-mode .chat-bubble {
        font-size: 0.85rem;
        padding: 0.5rem 0.75rem;
    }

    .container.theater-mode .sidebar-header h3 {
        font-size: 1rem;
    }
    
    .container.theater-mode .sidebar {
        transform: translateY(0);
        padding: 1.5rem;
    }
}

/* Custom Theater Toggle Button */
#theater-btn {
    width: auto;
    padding: 0.4rem 0.9rem;
    font-size: 0.75rem;
    border-radius: 8px;
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.4);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

#theater-btn:hover {
    background: rgba(139, 92, 246, 0.3);
}

#theater-btn.active {
    background: #8b5cf6;
    border-color: #a78bfa;
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.6);
    color: white;
}

#exit-room-btn {
    width: auto;
    padding: 0.4rem 0.9rem;
    border-radius: 8px;
    border: 1px solid rgba(248, 113, 113, 0.45);
    background: rgba(239, 68, 68, 0.12);
    color: #fecaca;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#exit-room-btn:hover {
    background: rgba(239, 68, 68, 0.24);
    border-color: rgba(248, 113, 113, 0.7);
}

@media (min-width: 1001px) {
    /* In normal desktop mode, sidebars perfectly match the height of the video container natively */
    .sidebar {
        height: auto;
    }
}

@media (max-width: 1000px) {
    body {
        padding: 1rem;
    }
    .container {
        padding: 0;
    }
    .app-layout {
        grid-template-columns: 1fr;
        height: auto;
        display: flex;
        flex-direction: column;
    }
    
    #main-player-area {
        order: -1;
    }

    .sidebar {
        height: 400px;
    }

    .room-info {
        gap: 0.65rem;
    }

    .room-info h3 {
        flex: 1 1 calc(100% - 24px);
    }

    .room-info .badge {
        margin-left: 0;
    }

    #theater-btn {
        margin-left: auto;
    }
}