/**
 * Modern ChatApp UI - Discord-inspired Design
 * Full RTL Support - Polished Layout
 * Clean CSS Variables Architecture
 */

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

:root {
    /* Background Colors */
    --bg-primary: #36393f;
    --bg-secondary: #2f3136;
    --bg-tertiary: #202225;
    --bg-quaternary: #18191c;
    
    /* Accent Colors */
    --accent-color: #5865f2;
    --accent-hover: #4752c4;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #dcddde;
    --text-muted: #72767d;
    
    /* Border & Hover */
    --border-color: rgba(32, 34, 37, 0.6);
    --border-color-strong: #202225;
    --hover-bg: #393c43;
    --active-bg: #3c3f44;
    --message-hover-bg: rgba(79, 84, 92, 0.2);
    --channel-hover-bg: rgba(57, 60, 67, 0.5);
    --member-hover-bg: rgba(57, 60, 67, 0.4);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    
    /* Status Colors */
    --success-color: #43b581;
    --error-color: #f04747;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 50%;
    
    /* Sidebar Widths */
    --sidebar-server-width: 76px;
    --sidebar-channel-width: 260px;
    --sidebar-members-width: 240px;
    
    /* Message Spacing */
    --message-padding: 24px;
    --message-gap: 10px;
}

body {
    font-family: 'Cairo', 'Segoe UI', 'Tahoma', 'Arial', sans-serif;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    height: 100vh;
    overflow: hidden;
    direction: rtl;
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== MODAL STYLES ========== */
.modal {
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    width: 90%;
    max-width: 420px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.modal-content h2 {
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.modal-content label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.modal-content input {
    padding: 0.75rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color-strong);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    width: 100%;
    transition: border-color 0.2s;
}

.modal-content input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.modal-content button {
    padding: 0.875rem;
    background-color: var(--accent-color);
    color: var(--text-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.modal-content button:hover {
    background-color: var(--accent-hover);
}

.modal-content p {
    text-align: center;
    margin-top: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.modal-content a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
}

.modal-content a:hover {
    text-decoration: underline;
}

.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    display: none;
    padding: var(--spacing-sm);
    background-color: rgba(240, 71, 71, 0.1);
    border-radius: var(--radius-sm);
}

.error-message.show {
    display: block;
}

/* ========== MAIN APP LAYOUT ========== */
#app {
    display: flex;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

/* ========== SERVER SIDEBAR (LEFT) - 76px ========== */
.server-sidebar {
    width: var(--sidebar-server-width);
    min-width: var(--sidebar-server-width);
    max-width: var(--sidebar-server-width);
    background-color: var(--bg-quaternary);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md) 0;
    gap: var(--spacing-sm);
    overflow-y: auto;
    overflow-x: hidden;
    border-left: 1px solid var(--border-color);
    flex-shrink: 0;
}

.server-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    min-height: 48px;
    border-radius: var(--radius-full);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    position: relative;
    flex-shrink: 0;
}

.server-icon:hover {
    background-color: var(--accent-color);
    border-radius: var(--radius-lg);
}

.server-icon.active {
    background-color: var(--accent-color);
    border-radius: var(--radius-lg);
}

.server-icon.active::before {
    content: '';
    position: absolute;
    right: -12px;
    width: 4px;
    height: 40px;
    background-color: var(--text-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.server-icon.create {
    background-color: var(--success-color);
    color: var(--text-primary);
}

.server-icon.create:hover {
    background-color: #3ca374;
    border-radius: var(--radius-lg);
}

/* ========== CHANNEL SIDEBAR (RIGHT FOR RTL) - 260px ========== */
.channel-sidebar {
    width: var(--sidebar-channel-width);
    min-width: var(--sidebar-channel-width);
    max-width: var(--sidebar-channel-width);
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-left: 1px solid var(--border-color);
    flex-shrink: 0;
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
}

.sidebar-header h3 {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}

.channels-section,
.dms-section {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-md) var(--spacing-sm);
    min-height: 0;
}

.section-header {
    padding: var(--spacing-sm) var(--spacing-md) 0.375rem;
    margin-bottom: var(--spacing-xs);
}

.section-title {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.channels-list,
.dm-list {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.channel-item,
.dm-item {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-muted);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9375rem;
    position: relative;
    margin: 0 var(--spacing-xs);
}

.channel-item::before {
    content: '#';
    opacity: 0.6;
    font-weight: 600;
}

.channel-item:hover,
.dm-item:hover {
    background-color: var(--channel-hover-bg);
    color: var(--text-secondary);
    transform: translateX(-2px);
}

.channel-item.active,
.dm-item.active {
    background-color: var(--accent-color);
    color: var(--text-primary);
    font-weight: 500;
}

.channel-item.active:hover {
    background-color: var(--accent-hover);
}

.channel-item.active::after {
    content: '';
    position: absolute;
    right: -0.75rem;
    width: 3px;
    height: 100%;
    background-color: var(--text-primary);
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    transition: opacity var(--transition-fast);
}

.create-channel-btn {
    width: calc(100% - var(--spacing-sm));
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: transparent;
    border: none;
    color: var(--text-muted);
    text-align: right;
    cursor: pointer;
    border-radius: var(--radius-sm);
    margin: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
}

.create-channel-btn:hover {
    background-color: var(--channel-hover-bg);
    color: var(--text-secondary);
    transform: translateX(-2px);
}

.create-channel-btn .icon {
    font-size: 1.25rem;
    font-weight: 300;
}

/* ========== CHAT WINDOW (CENTER) ========== */
.chat-window {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    overflow: hidden;
    position: relative;
}

/* Chat Header - Sticky at Top */
.chat-header {
    padding: 0 var(--spacing-md);
    height: 48px;
    min-height: 48px;
    max-height: 48px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.1);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
    min-width: 0;
}

.channel-icon {
    color: var(--text-muted);
    font-size: 1.25rem;
    font-weight: 600;
    flex-shrink: 0;
    line-height: 1;
}

.channel-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
    gap: 0.125rem;
}

.channel-title {
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-weight: 600;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    line-height: 1.2;
}

.channel-description {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    line-height: 1.2;
    display: none; /* Hide description to keep header compact */
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.header-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    border: none;
    background-color: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.header-btn:hover {
    background-color: var(--hover-bg);
    color: var(--text-secondary);
    transform: scale(1.05);
}

.header-btn svg {
    width: 18px;
    height: 18px;
    display: block;
}

/* Messages Container - Scrollable */
.messages-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--message-padding);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--message-gap);
    min-height: 0;
    scroll-behavior: smooth;
}

/* Message Row Design */
.message-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: 0.5rem 0;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
    position: relative;
    margin-bottom: var(--message-gap);
    width: 100%;
    max-width: 900px;
}

.message-card:hover {
    background-color: var(--message-hover-bg);
}

.message-card:hover .message-actions {
    opacity: 1;
}

.message-card.grouped {
    padding-top: 0.125rem;
    margin-top: calc(var(--message-gap) * -1);
}

.message-card.grouped .message-avatar {
    visibility: hidden;
}

.message-avatar {
    width: 40px;
    height: 40px;
    min-width: 40px;
    min-height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--accent-color), #7289da);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    flex-shrink: 0;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.message-avatar:hover {
    transform: scale(1.08);
}

.message-avatar img {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.message-content-wrapper {
    flex: 1;
    min-width: 0;
    max-width: 100%;
    padding-top: 0.125rem;
}

.message-header {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    flex-wrap: nowrap;
}

.message-author {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    line-height: 1.2;
    transition: color var(--transition-fast);
}

.message-author:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
    line-height: 1.2;
    white-space: nowrap;
}

.message-text {
    color: var(--text-secondary);
    word-wrap: break-word;
    word-break: break-word;
    line-height: 1.375;
    font-size: 0.9375rem;
    padding-right: 0;
}

.message-actions {
    position: absolute;
    left: var(--spacing-sm);
    top: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-normal);
    background-color: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    z-index: 5;
}

.message-action-btn {
    width: 28px;
    height: 28px;
    min-width: 28px;
    min-height: 28px;
    border: none;
    background-color: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.message-action-btn:hover {
    background-color: var(--hover-bg);
    color: var(--text-secondary);
    transform: scale(1.1);
}

.message-action-btn svg {
    width: 16px;
    height: 16px;
    display: block;
}

.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-xl);
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-weight: 600;
}

.empty-state p {
    font-size: 0.9375rem;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.date-separator {
    text-align: center;
    padding: var(--spacing-md) 0;
    margin: var(--spacing-md) 0;
    position: relative;
}

.date-separator::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--border-color);
    z-index: 0;
}

.date-separator span {
    position: relative;
    background: var(--bg-primary);
    padding: 0 0.75rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    z-index: 1;
}

/* Message Input - Sticky at Bottom */
.message-input-container {
    padding: var(--spacing-md) var(--message-padding);
    flex-shrink: 0;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    position: sticky;
    bottom: 0;
    z-index: 10;
    display: flex;
    justify-content: center;
}

.message-form {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    border: 1px solid transparent;
    transition: border-color var(--transition-fast);
    max-width: 900px;
    width: 100%;
}

.message-form:focus-within {
    border-color: var(--border-color);
}

.input-wrapper {
    flex: 1;
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 0.5rem 0.75rem;
    min-height: 44px;
}

.input-icon-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    border: none;
    background-color: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.input-icon-btn:hover {
    background-color: var(--hover-bg);
    color: var(--text-secondary);
    transform: scale(1.1);
}

.input-icon-btn svg {
    width: 18px;
    height: 18px;
    display: block;
}

#messageInput {
    flex: 1;
    border: none;
    background-color: transparent;
    color: var(--text-primary);
    font-size: 0.9375rem;
    padding: var(--spacing-sm) 0;
    min-height: 20px;
    max-height: 200px;
    resize: none;
    font-family: inherit;
    min-width: 0;
    line-height: 1.375;
    overflow-y: auto;
    overflow-x: hidden;
}

#messageInput:focus {
    outline: none;
}

#messageInput::placeholder {
    color: var(--text-muted);
}

.send-btn {
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    border: none;
    background-color: var(--accent-color);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

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

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-btn svg {
    width: 18px;
    height: 18px;
    display: block;
}

/* ========== MEMBERS SIDEBAR (FAR RIGHT) - 240px ========== */
.members-sidebar {
    width: var(--sidebar-members-width);
    min-width: var(--sidebar-members-width);
    max-width: var(--sidebar-members-width);
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border-color);
    overflow: hidden;
    flex-shrink: 0;
}

.members-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    flex-shrink: 0;
}

.members-header h4 {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.members-list {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-sm);
    min-height: 0;
}

.member-item {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin: 0.125rem 0;
}

.member-item:hover {
    background-color: var(--member-hover-bg);
    transform: translateX(-2px);
}

.member-item:hover .member-name {
    color: var(--text-primary);
}

.member-avatar {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--accent-color), #7289da);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    flex-shrink: 0;
    position: relative;
    transition: transform var(--transition-fast);
}

.member-item:hover .member-avatar {
    transform: scale(1.05);
}

.member-avatar img {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.member-status {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 10px;
    height: 10px;
    min-width: 10px;
    min-height: 10px;
    border-radius: var(--radius-full);
    background-color: var(--text-muted);
    border: 2px solid var(--bg-secondary);
}

.member-status.online {
    background-color: var(--success-color);
}

.member-status.offline {
    background-color: var(--text-muted);
}

.member-info {
    flex: 1;
    min-width: 0;
}

.member-name-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    min-width: 0;
}

.member-name {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    transition: color var(--transition-fast);
}

/* Role Badges - Small pill badges for user roles */
.role-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem; /* 12px - matches requirement */
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    line-height: 1.2;
    white-space: nowrap;
    transition: all var(--transition-fast);
    margin-right: var(--spacing-xs); /* RTL-friendly spacing */
}

.role-admin {
    background-color: var(--accent-color);
    color: var(--text-primary);
}

.role-mod {
    background-color: var(--text-muted);
    color: var(--text-primary);
}

/* Role badge in message header */
.message-header .role-badge {
    margin-right: var(--spacing-xs);
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--bg-quaternary);
    background-clip: padding-box;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .channel-sidebar {
        width: 240px;
        min-width: 240px;
        max-width: 240px;
    }
}

@media (max-width: 768px) {
    .server-sidebar {
        width: 70px;
        min-width: 70px;
        max-width: 70px;
    }
    
    .channel-sidebar,
    .members-sidebar {
        position: absolute;
        top: 0;
        height: 100%;
        z-index: 100;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    }

    .channel-sidebar {
        right: 0;
    }

    .members-sidebar {
        left: 0;
    }
    
    .messages-container {
        padding: var(--spacing-md);
    }
    
    .message-input-container {
        padding: var(--spacing-md);
    }
}