* {
    box-sizing: border-box;
}
:root {
    --messenger-bg: #0d0d0f;
    --messenger-surface: #1c1c1e;
    --messenger-surface-2: #242526;
    --messenger-surface-3: #2d2d32;
    --messenger-accent: #0084ff;
    --messenger-accent-hover: #0073e6;
    --messenger-text: #e4e6eb;
    --messenger-text-secondary: #b0b3b8;
    --messenger-border: #2d2d32;
    --messenger-red: #e41e3a;
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--messenger-bg);
    color: var(--messenger-text);
    min-height: 100vh;
}

/* Auth pages - Messenger style */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1rem;
    background: var(--messenger-bg);
}
.auth-box {
    background: var(--messenger-surface);
    padding: 2rem;
    border-radius: 16px;
    width: 100%;
    max-width: 380px;
    border: 1px solid var(--messenger-border);
}
.auth-box h1 {
    margin: 0 0 0.5rem;
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    color: var(--messenger-text);
}
.auth-box input {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--messenger-border);
    border-radius: 8px;
    background: var(--messenger-surface-2);
    color: var(--messenger-text);
    font-size: 1rem;
}
.auth-box input::placeholder {
    color: var(--messenger-text-secondary);
}
.auth-box button {
    width: 100%;
    padding: 0.75rem;
    background: var(--messenger-accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 1rem;
}
.auth-box button:hover {
    background: var(--messenger-accent-hover);
}
.auth-box .error {
    color: #f02849;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}
.auth-box .success {
    color: #31a24c;
    margin-bottom: 1rem;
}
.auth-box a {
    color: var(--messenger-accent);
    text-decoration: none;
}
.auth-box a:hover {
    text-decoration: underline;
}
.auth-box .auth-label {
    display: block;
    font-size: 0.9rem;
    color: var(--messenger-text-secondary);
    margin: 0.5rem 0 0.25rem;
}
.auth-box .auth-link {
    color: var(--messenger-accent);
}
.auth-box p {
    text-align: center;
    margin: 0;
    color: var(--messenger-text-secondary);
}

/* Dashboard */
.dashboard-page {
    max-width: 600px;
    margin: 0 auto;
    padding: 1.5rem;
}
.dash-header {
    margin-bottom: 2rem;
}
.dash-header h1 {
    margin: 0 0 0.25rem;
    font-size: 1.5rem;
}
.dash-header p {
    margin: 0;
    font-size: 0.95rem;
    color: #aaa;
}
.dash-header a {
    color: #e94560;
    margin-left: 0.5rem;
}
.tip {
    background: #0f3460;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    color: #aaa;
    margin-bottom: 1rem;
}
.ring-hint {
    background: #1a3a2e;
    color: #4ecca3;
}
.incoming-calls, .user-list {
    background: #16213e;
    padding: 1.25rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
}
.incoming-calls h2, .user-list h2 {
    margin: 0 0 1rem;
    font-size: 1.1rem;
    color: #ccc;
}
.incoming-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid #0f3460;
}
.incoming-item:last-child {
    border-bottom: none;
}
.btn-answer {
    padding: 0.4rem 1rem;
    background: #4ecca3;
    color: #1a1a2e;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}
.btn-answer:hover {
    background: #5ff0c0;
}
.user-list ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.user-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0;
    border-bottom: 1px solid #0f3460;
}
.user-list li:last-child {
    border-bottom: none;
}
.btn-call {
    padding: 0.4rem 1rem;
    background: #e94560;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}
.btn-call:hover {
    background: #ff6b6b;
}
.muted {
    color: #666;
    font-size: 0.9rem;
}

/* Call page */
.call-page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 1rem;
}
.call-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}
.call-header a {
    color: #4ecca3;
    text-decoration: none;
}
.call-header a:hover {
    text-decoration: underline;
}
.videos {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
}
.video-box {
    position: relative;
    background: #0f3460;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 4/3;
}
.video-box video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.video-box .label {
    position: absolute;
    bottom: 8px;
    left: 8px;
    background: rgba(0,0,0,0.6);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
}
.call-status {
    text-align: center;
    padding: 0.75rem;
    color: #aaa;
}
.call-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 1rem;
}
.call-controls button {
    padding: 0.6rem 1.25rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
}
#btnEnd {
    background: #e94560;
    color: #fff;
}
#btnEnd:hover {
    background: #ff6b6b;
}
#btnMute, #btnCamera {
    background: #16213e;
    color: #eee;
    border: 1px solid #0f3460;
}
#btnMute:hover, #btnCamera:hover {
    background: #0f3460;
}

/* Call page - new layout: full-screen remote + PiP + control bar */
.call-page-new {
    padding: 0;
    background: var(--messenger-bg);
    color: var(--messenger-text);
}
.call-header-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
    padding: 0.75rem 1rem;
    margin: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.6) 0%, transparent 100%);
}
.call-header-bar .call-back {
    color: #fff;
    font-size: 1.25rem;
    text-decoration: none;
}
.call-header-bar .call-title {
    color: #fff;
    font-weight: 600;
    font-size: 1rem;
}
.call-stage {
    position: relative;
    flex: 1;
    min-height: 100vh;
    min-height: 100dvh;
}
.call-remote-wrap {
    position: absolute;
    inset: 0;
    background: var(--messenger-surface);
}
.call-remote-wrap video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.call-remote-label {
    position: absolute;
    bottom: 80px;
    left: 1rem;
    background: rgba(0,0,0,0.5);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.9rem;
}
.call-tap-hint {
    position: absolute;
    top: 4rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 15;
    margin: 0;
    padding: 0.5rem 1rem;
    background: rgba(0,0,0,0.75);
    border-radius: 8px;
    color: #fff;
    font-size: 0.9rem;
    max-width: 90%;
    text-align: center;
}
.call-page-new .call-status {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1rem;
    background: rgba(0,0,0,0.5);
    border-radius: 8px;
    color: #fff;
}
.call-pip {
    position: absolute;
    top: 4.5rem;
    right: 1rem;
    width: 120px;
    height: 160px;
    border-radius: 12px;
    overflow: hidden;
    background: #2d2d32;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    z-index: 5;
}
.call-pip video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.call-pip-label {
    position: absolute;
    bottom: 4px;
    left: 4px;
    font-size: 0.75rem;
    background: rgba(0,0,0,0.6);
    padding: 2px 6px;
    border-radius: 4px;
}
.call-volume-wrap {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    z-index: 5;
}
.call-volume-icon {
    font-size: 1.25rem;
}
.call-volume-slider {
    width: 6px;
    height: 120px;
    -webkit-appearance: slider-vertical;
    appearance: slider-vertical;
    writing-mode: vertical-lr;
    direction: rtl;
    background: rgba(255,255,255,0.2);
    border-radius: 3px;
    outline: none;
}
.call-volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--messenger-accent);
    cursor: pointer;
}
.call-controls-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem 1.5rem 2rem;
    background: linear-gradient(0deg, rgba(0,0,0,0.75) 0%, transparent 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    z-index: 10;
}
.call-ctrl-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.2);
    color: #fff;
    font-size: 1.4rem;
    cursor: pointer;
}
.call-ctrl-btn:hover {
    background: rgba(255,255,255,0.3);
}
.call-ctrl-end {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    background: var(--messenger-red);
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}
.call-ctrl-end:hover {
    background: #c41a2e;
}

@media (max-width: 600px) {
    .videos {
        grid-template-columns: 1fr;
    }
    .call-pip {
        width: 90px;
        height: 120px;
        top: 3.5rem;
        right: 0.5rem;
    }
    .call-volume-wrap {
        left: 0.5rem;
    }
    .call-volume-slider {
        height: 80px;
    }
}

/* Messenger-style dashboard */
.messenger-page {
    background: var(--messenger-bg);
    color: var(--messenger-text);
    min-height: 100vh;
    max-width: 500px;
    margin: 0 auto;
}
.messenger-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--messenger-surface);
    border-bottom: 1px solid var(--messenger-border);
}
.messenger-logo {
    margin: 0;
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--messenger-text);
}
.messenger-settings {
    color: var(--messenger-accent);
    text-decoration: none;
    font-size: 0.9375rem;
    margin-right: 0.75rem;
}
.messenger-settings:hover {
    text-decoration: underline;
}
.messenger-logout {
    color: var(--messenger-text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
}
.messenger-logout:hover {
    color: var(--messenger-text);
}
.messenger-search-wrap {
    position: relative;
    padding: 0.5rem 1rem;
    background: var(--messenger-bg);
}
.messenger-search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    color: var(--messenger-text-secondary);
}
.messenger-search {
    width: 100%;
    padding: 0.625rem 1rem 0.625rem 2.5rem;
    border: none;
    border-radius: 24px;
    background: var(--messenger-surface-3);
    color: var(--messenger-text);
    font-size: 0.9375rem;
}
.messenger-search::placeholder {
    color: var(--messenger-text-secondary);
}
.messenger-stories-wrap {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--messenger-border);
    overflow: hidden;
}
.messenger-stories {
    display: flex;
    gap: 1rem;
    padding: 0 1rem;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.messenger-stories::-webkit-scrollbar {
    display: none;
}
.story-item {
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
    cursor: pointer;
}
.story-avatar-ring {
    padding: 3px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
    flex-shrink: 0;
}
.story-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.25rem;
    color: #fff;
    background: var(--messenger-surface-2);
    overflow: hidden;
}
.avatar-initial {
    background: var(--messenger-accent);
}
.story-avatar-img {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    display: block;
}
.story-name {
    font-size: 0.8125rem;
    color: var(--messenger-text-secondary);
    max-width: 72px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.messenger-tabs {
    display: flex;
    gap: 0;
    padding: 0 1rem;
    border-bottom: 1px solid var(--messenger-border);
}
.messenger-tab {
    padding: 0.75rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--messenger-text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
}
.messenger-tab.active {
    color: var(--messenger-accent);
    border-bottom: 2px solid var(--messenger-accent);
    margin-bottom: -1px;
}
.incoming-calls-banner {
    padding: 0.5rem 1rem;
    background: var(--messenger-surface);
    border-bottom: 1px solid var(--messenger-border);
}
.incoming-calls-banner .incoming-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0;
    border: none;
}
.incoming-calls-banner .btn-answer {
    margin-left: auto;
    background: var(--messenger-accent);
    color: #fff;
}
.incoming-calls-banner .btn-answer:hover {
    background: var(--messenger-accent-hover);
}
.ring-hint-banner {
    margin: 0;
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    color: var(--messenger-text-secondary);
    background: var(--messenger-surface);
}

/* Incoming call full-screen popup */
.incoming-call-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.incoming-call-backdrop {
    position: absolute;
    inset: 0;
    background: var(--messenger-bg);
    opacity: 0.98;
}
.incoming-call-card {
    position: relative;
    text-align: center;
    max-width: 320px;
    width: 100%;
}
.incoming-call-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 600;
    color: #fff;
    overflow: hidden;
}
.incoming-call-avatar-initial {
    background: var(--messenger-accent);
}
.incoming-call-avatar-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.incoming-call-name {
    margin: 0 0 0.25rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--messenger-text);
}
.incoming-call-label {
    margin: 0 0 1.5rem;
    font-size: 0.9375rem;
    color: var(--messenger-text-secondary);
}
.incoming-call-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.incoming-call-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 1rem;
    border-radius: 24px;
    background: var(--messenger-surface-3);
    color: var(--messenger-text);
    text-decoration: none;
    font-size: 0.9375rem;
}
.incoming-call-btn:hover {
    background: var(--messenger-surface-2);
}
.incoming-call-slide-wrap {
    width: 100%;
}
.incoming-slide-track {
    position: relative;
    height: 56px;
    background: var(--messenger-surface-3);
    border-radius: 28px;
    display: flex;
    align-items: center;
    padding: 0 0 0 60px;
    cursor: pointer;
    user-select: none;
}
.incoming-slide-icon {
    position: absolute;
    left: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--messenger-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    pointer-events: none;
}
.incoming-slide-thumb {
    position: absolute;
    left: 0;
    top: 4px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    cursor: grab;
    transition: left 0.05s ease-out;
}
.incoming-slide-thumb:active {
    cursor: grabbing;
}
.incoming-slide-text {
    flex: 1;
    text-align: center;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--messenger-text-secondary);
    pointer-events: none;
}
.messenger-conversations {
    list-style: none;
    margin: 0;
    padding: 0;
}
.conv-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--messenger-border);
    cursor: pointer;
    min-height: 52px;
}
.conv-item:hover {
    background: var(--messenger-surface);
}
.conv-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.125rem;
    color: #fff;
    background: var(--messenger-accent);
}
.conv-avatar-img {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}
.conv-body {
    flex: 1;
    min-width: 0;
}
.conv-name {
    display: block;
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--messenger-text);
    margin-bottom: 0.125rem;
}
.conv-preview {
    display: block;
    font-size: 0.8125rem;
    color: var(--messenger-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.conv-time {
    font-size: 0.75rem;
    color: var(--messenger-text-secondary);
    flex-shrink: 0;
}
.conv-empty {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--messenger-text-secondary);
    font-size: 0.9375rem;
    list-style: none;
}

/* Chat page (Messenger style) */
.chat-page {
    background: var(--messenger-bg);
    color: var(--messenger-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 500px;
    margin: 0 auto;
}
.chat-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--messenger-surface);
    border-bottom: 1px solid var(--messenger-border);
}
.chat-back {
    color: var(--messenger-accent);
    text-decoration: none;
    font-size: 1.25rem;
}
.chat-header-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
    color: #fff;
    background: var(--messenger-accent);
}
.chat-header-avatar-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}
.chat-header-info {
    flex: 1;
    min-width: 0;
}
.chat-header-name {
    font-weight: 600;
    font-size: 0.9375rem;
}
.chat-call-link {
    color: var(--messenger-accent);
    text-decoration: none;
    font-size: 1rem;
}
.chat-messages {
    flex: 1;
    list-style: none;
    margin: 0;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.chat-msg {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    max-width: 82%;
}
.chat-msg-me {
    align-self: flex-end;
    align-items: flex-end;
}
.chat-bubble {
    padding: 0.5rem 0.875rem;
    border-radius: 18px;
    font-size: 0.9375rem;
    line-height: 1.35;
    word-break: break-word;
    position: relative;
}
.chat-msg-them .chat-bubble {
    background: #3a3b3c;
    color: var(--messenger-text);
    border-bottom-left-radius: 4px;
}
.chat-msg-me .chat-bubble {
    background: var(--messenger-accent);
    color: #fff;
    border-bottom-right-radius: 4px;
}
.chat-msg-time {
    font-size: 0.6875rem;
    color: var(--messenger-text-secondary);
    margin-top: 0.125rem;
}
.chat-input-wrap {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--messenger-surface);
    border-top: 1px solid var(--messenger-border);
}
.chat-input {
    flex: 1;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 24px;
    background: var(--messenger-surface-3);
    color: var(--messenger-text);
    font-size: 0.9375rem;
}
.chat-input::placeholder {
    color: var(--messenger-text-secondary);
}
.chat-send {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 24px;
    background: var(--messenger-accent);
    color: #fff;
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
}
.chat-send:hover {
    background: var(--messenger-accent-hover);
}

/* Settings page */
.settings-page .settings-box {
    max-width: 420px;
    background: var(--messenger-surface);
    border: 1px solid var(--messenger-border);
}
.settings-profile {
    text-align: center;
    margin-bottom: 1.5rem;
}
.settings-label {
    font-size: 0.9rem;
    color: var(--messenger-text-secondary);
    margin: 0 0 0.5rem;
}
.settings-avatar-img {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    margin: 0 auto 0.5rem;
}
.settings-avatar-initial {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 600;
    color: #fff;
    margin: 0 auto 0.5rem;
    background: var(--messenger-accent);
}
.settings-username {
    margin: 0;
    font-weight: 600;
    font-size: 1.0625rem;
    color: var(--messenger-text);
}
.settings-form {
    margin-top: 1rem;
}
.settings-form input[type="file"] {
    margin: 0.5rem 0 1rem;
    display: block;
}
.settings-form button {
    background: var(--messenger-accent);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}
.settings-form button:hover {
    background: var(--messenger-accent-hover);
}