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

:root {
    --bg-dark: #0d0d1a;
    --bg-sidebar: #12121f;
    --accent: #e85d2c;
    --accent-hover: #c94f26;
    --accent-soft: rgba(232, 93, 44, 0.12);
    --text: #1a1a2e;
    --text-muted: #6b6b80;
    --surface: #f5f5f7;
    --surface-hover: #ebebef;
    --border: #e8e8ec;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    --transition: 0.2s ease;
}

body {
    background: var(--bg-dark);
    height: 100vh;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    color: var(--text);
}

.login-screen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, #0d0d1a 0%, #1a1a2e 50%, #0d0d1a 100%);
    opacity: 1;
    transition: opacity 0.5s ease;
}

.login-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.login-screen.hidden .login-form-card {
    transform: scale(0.9);
    opacity: 0;
}

.login-screen-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.login-screen-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.4;
    animation: float 8s ease-in-out infinite;
}

.login-screen-orb.orb-1 {
    width: 200px;
    height: 200px;
    background: var(--accent);
    top: 10%;
    left: 20%;
    animation-delay: 0s;
}

.login-screen-orb.orb-2 {
    width: 150px;
    height: 150px;
    background: #6366f1;
    top: 60%;
    right: 15%;
    animation-delay: -2s;
}

.login-screen-orb.orb-3 {
    width: 180px;
    height: 180px;
    background: #22c55e;
    bottom: 20%;
    left: 10%;
    animation-delay: -4s;
}

.login-screen-orb.orb-4 {
    width: 100px;
    height: 100px;
    background: #eab308;
    top: 30%;
    right: 30%;
    animation-delay: -1s;
}

.login-screen-orb.orb-5 {
    width: 120px;
    height: 120px;
    background: #ec4899;
    bottom: 30%;
    right: 25%;
    animation-delay: -3s;
}

@keyframes float {
    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(20px, -20px) scale(1.05);
    }
    66% {
        transform: translate(-15px, 15px) scale(0.95);
    }
}

.login-form-card {
    position: relative;
    width: 100%;
    max-width: 380px;
    padding: 40px 36px;
    background: rgba(255, 255, 255, 0.96);
    border-radius: 24px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    animation: loginCardIn 0.6s ease forwards;
    transform: scale(0.95);
    opacity: 0;
}

@keyframes loginCardIn {
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.login-form-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #fff;
    font-size: 28px;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(232, 93, 44, 0.35);
}

.login-form-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    text-align: center;
    margin-bottom: 8px;
}

.login-form-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 24px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.login-password-field {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.login-password-field:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.login-password-field i {
    font-size: 18px;
    color: var(--text-muted);
}

.login-password-field input {
    flex: 1;
    border: none;
    background: none;
    font-size: 15px;
    outline: none;
}

.login-password-field input::placeholder {
    color: var(--text-muted);
}

.login-form-error-message {
    font-size: 13px;
    color: #dc2626;
    min-height: 20px;
    margin: 0;
}

.login-form.error .login-password-field {
    border-color: #dc2626;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%,
    100% {
        transform: translateX(0);
    }
    20% {
        transform: translateX(-8px);
    }
    40% {
        transform: translateX(8px);
    }
    60% {
        transform: translateX(-4px);
    }
    80% {
        transform: translateX(4px);
    }
}

.login-submit-button {
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform var(--transition), box-shadow var(--transition);
    margin-top: 8px;
}

.login-submit-button:hover {
    box-shadow: 0 8px 24px rgba(232, 93, 44, 0.4);
    transform: translateY(-1px);
}

.login-submit-button:disabled {
    opacity: 0.8;
    cursor: not-allowed;
    transform: none;
}

.login-submit-button-loading {
    display: none;
}

.login-submit-button.loading .login-submit-button-text {
    display: none;
}

.login-submit-button.loading .login-submit-button-loading {
    display: inline-flex;
    font-size: 18px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}


/* ========== Call overlay ========== */

.call-screen {
    position: fixed;
    inset: 0;
    z-index: 9000;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.call-screen.is-visible {
    opacity: 1;
    visibility: visible;
}

.call-screen .call-screen-container {
    width: 100%;
    max-width: 500px;
    background: #1a1a2e;
    border-radius: 20px;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.call-screen.is-visible .call-screen-container {
    transform: scale(1);
    animation: callIn 0.35s ease;
}

@keyframes callIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.call-screen-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.call-type-label {
    font-size: 14px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
}

.call-close-button {
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: background var(--transition);
}

.call-close-button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.call-screen-main {
    position: relative;
    padding: 32px 24px;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.call-remote-view {
    text-align: center;
    position: relative;
}

.call-remote-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(255, 255, 255, 0.2);
}

.call-remote-video-area {
    position: absolute;
    inset: 0;
    background: #0d0d1a;
    border-radius: 16px;
    overflow: hidden;
}

.call-remote-video-area video,
.call-remote-video-area iframe {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.call-screen.video-mode .call-remote-avatar {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 320px;
    border-radius: 16px;
    position: absolute;
    inset: 0;
    object-fit: cover;
}

.call-screen.video-mode .call-remote-view {
    width: 100%;
    min-height: 280px;
    border-radius: 16px;
    overflow: hidden;
    background: #0d0d1a;
}

.call-remote-name {
    display: block;
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    margin-top: 16px;
}

.call-connection-status,
.call-duration-timer {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 4px;
}

.call-duration-timer {
    font-variant-numeric: tabular-nums;
    margin-top: 8px;
    font-size: 18px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
}

.call-local-video-area {
    position: absolute;
    bottom: 24px;
    right: 24px;
    width: 120px;
    height: 90px;
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.3);
    background: #000;
}

.call-local-video-area video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.call-control-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.call-control-button {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition), transform var(--transition);
}

.call-control-button:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.call-control-button.active {
    background: var(--accent);
    color: #fff;
}

.call-control-button-end {
    background: #dc2626;
    color: #fff;
}

.call-control-button-end:hover {
    background: #b91c1c;
}

.main-application.is-hidden {
    display: none;
}

.main-application {
    width: 100%;
    height: 100vh;
    max-height: 100vh;
    background: #fff;
    display: flex;
    border-radius: 0;
    overflow: hidden;
    box-shadow: none;
}

@media (min-width: 1024px) {
    .main-application {
        width: 100%;
        height: 100vh;
        border-radius: 0;
    }
}

.main-sidebar {
    width: 72px;
    background: var(--bg-sidebar);
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 0;
}

.sidebar-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.sidebar-menu-item {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.2rem;
    transition: background-color var(--transition), transform var(--transition);
}

.sidebar-menu-item i {
    font-size: 1.2rem;
}

.sidebar-menu-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: scale(1.05);
}

.sidebar-menu-item.is-active {
    background: var(--accent);
    color: #fff;
}

.sidebar-menu-item-profile {
    margin-top: auto;
}

.sidebar-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 11px;
    color: rgba(255, 255, 255, 0.6);
}

.sidebar-footer-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

.sidebar-backdrop-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 100;
    opacity: 0;
    transition: opacity var(--transition);
}

.sidebar-backdrop-overlay.show {
    display: block;
    opacity: 1;
}


/* Conversations list */

.conversations-list {
    width: 300px;
    min-width: 260px;
    background: var(--surface);
    padding: 16px;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
}

.conversations-list-header {
    flex-shrink: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.conversations-list-header .search-input-wrapper {
    width: 100%;
    order: 3;
}

.button-menu-toggle {
    display: none;
}

.conversations-list-header h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text);
    flex: 1;
    min-width: 0;
}

.search-input-wrapper {
    position: relative;
}

.search-input-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    opacity: 0.5;
    pointer-events: none;
}

.search-input-wrapper input {
    width: 100%;
    padding: 10px 12px 10px 36px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: #fff;
    font-size: 14px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input-wrapper input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.conversation-list-item {
    display: flex;
    gap: 12px;
    padding: 12px;
    margin-top: 4px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}

.conversation-list-item:hover {
    background: var(--surface-hover);
}

.conversation-list-item.is-active {
    background: #fff;
    box-shadow: var(--shadow);
}

.conversation-list-item.is-hidden {
    display: none;
}

.conversation-list-item img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.conversation-item-content {
    flex: 1;
    min-width: 0;
    position: relative;
}

.conversation-item-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 8px;
}

.conversation-item-header h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item-time {
    font-size: 12px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.conversation-item-preview {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item-unread-count {
    position: absolute;
    top: 0;
    right: 0;
    min-width: 18px;
    height: 18px;
    padding: 0 6px;
    border-radius: 9px;
    background: var(--accent);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}


/* Conversation area */

.conversation-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.conversation-area-header {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fff;
}

.conversation-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.button-back-to-list {
    display: none;
}

.conversation-header-user {
    display: flex;
    gap: 12px;
    align-items: center;
    min-width: 0;
}

.icon-button i {
    font-size: 1.1rem;
}

.conversation-header-user img {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    object-fit: cover;
}

.conversation-header-user-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.conversation-header-user-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
}

.conversation-header-user-status {
    font-size: 12px;
    color: var(--text-muted);
}

.conversation-header-actions {
    display: flex;
    gap: 4px;
}

.icon-button {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--surface);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition), transform var(--transition);
}

.icon-button:hover {
    background: var(--surface-hover);
    transform: scale(1.05);
}


/* Messages list */

.messages-list {
    flex: 1;
    padding: 20px;
    background: #fafafa;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.message-bubble {
    max-width: 70%;
    padding: 12px 14px;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    animation: messageIn 0.25s ease;
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(8px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message-bubble-text {
    font-size: 14px;
    line-height: 1.45;
}

.message-bubble-time {
    font-size: 11px;
    color: var(--text-muted);
    align-self: flex-end;
    opacity: 0.8;
}

.message-bubble-received {
    background: #fff;
    border: 1px solid var(--border);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.message-bubble-sent {
    background: var(--accent);
    color: #fff;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.message-bubble-sent .message-bubble-time {
    color: rgba(255, 255, 255, 0.85);
}


/* Quick reply suggestions */

.quick-reply-suggestions {
    padding: 8px 20px 4px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    background: #fafafa;
    border-top: 1px solid var(--border);
}

.quick-reply-option {
    padding: 8px 14px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.quick-reply-option i {
    font-size: 14px;
}

.quick-reply-option:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.typing-indicator {
    padding: 8px 20px;
    display: flex;
    gap: 4px;
    align-items: center;
    background: #fafafa;
    font-size: 12px;
    color: var(--text-muted);
    min-height: 36px;
}

.typing-indicator[aria-hidden="true"] {
    display: none;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: typing 1.2s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%,
    80%,
    100% {
        transform: scale(0.6);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}


/* Message input area */

.message-input-area {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    background: #fff;
}

.message-input-field-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    flex-direction: column;
}

.message-input-area input {
    width: 100%;
    padding: 12px 16px;
    border-radius: 22px;
    border: 1px solid var(--border);
    font-size: 14px;
    font-family: inherit;
    transition: border-color var(--transition), box-shadow var(--transition);
    resize: none;
    min-height: 44px;
}

.message-input-area input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.message-input-command-hint {
    position: absolute;
    bottom: 12px;
    left: 16px;
    font-size: 12px;
    color: var(--text-muted);
    pointer-events: none;
}

.message-input-command-hint[aria-hidden="true"] {
    display: none;
}

.message-input-area input:focus+.message-input-command-hint,
.message-input-area input:not(:placeholder-shown)+.message-input-command-hint {
    display: none;
}

.button-attach-file,
.button-emoji-picker {
    font-size: 18px;
}

.button-send-message {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--accent);
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition), transform var(--transition);
}

.button-send-message:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.button-send-message:active {
    transform: scale(0.98);
}

.button-send-message i {
    font-size: 1rem;
}


/* Toast message (for button actions) */

.toast-message {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 12px 20px;
    background: var(--text);
    color: #fff;
    font-size: 14px;
    border-radius: var(--radius);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    max-width: 90%;
}

.toast-message.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}


/* ========== Responsive: Tablet ========== */

@media (max-width: 1023px) {
    .main-application {
        width: 100%;
        height: 100vh;
        border-radius: 0;
    }
    .conversations-list {
        width: 280px;
        min-width: 240px;
    }
}


/* ========== Responsive: Phone ========== */

@media (max-width: 767px) {
    .main-application {
        width: 100%;
        height: 100vh;
        position: relative;
    }
    .main-sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 72px;
        z-index: 200;
        transform: translateX(-100%);
        transition: transform var(--transition);
    }
    .main-sidebar.open {
        transform: translateX(0);
    }
    .button-menu-toggle {
        display: flex;
    }
    .conversations-list-header h3 {
        margin-bottom: 8px;
    }
    .conversations-list {
        width: 100%;
        min-width: 0;
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 2;
        transition: transform var(--transition);
    }
    .conversations-list.hide-on-mobile {
        transform: translateX(-100%);
    }
    .conversation-area {
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        z-index: 3;
        transform: translateX(100%);
        transition: transform var(--transition);
        background: #fff;
    }
    .conversation-area.visible {
        transform: translateX(0);
    }
    .button-back-to-list {
        display: flex;
    }
    .conversation-area-header .conversation-header-user img {
        width: 36px;
        height: 36px;
    }
    .conversation-header-user-name {
        font-size: 14px;
    }
    .messages-list {
        padding: 12px 16px;
    }
    .message-bubble {
        max-width: 85%;
    }
    .quick-reply-suggestions {
        padding: 8px 16px;
    }
    .message-input-area {
        padding: 12px 16px;
        gap: 8px;
    }
    .message-input-area input {
        min-height: 40px;
        padding: 10px 14px;
    }
    .icon-button {
        width: 36px;
        height: 36px;
    }
    .button-send-message {
        width: 40px;
        height: 40px;
    }
}