/* Whisper Messaging - Design System */
:root {
    /* Color Palette: Coastal Fog meets Copper & Slate */
    --primary: #4A6670;
    --primary-light: #8FA3B0;
    --primary-dark: #2E3B42;
    --accent: #B87333;
    --accent-light: #D4A574;
    --accent-glow: rgba(184, 115, 51, 0.15);
    
    /* Neutrals */
    --bg-primary: #F7F5F2;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #E8E4DF;
    --bg-sidebar: #FAFAF8;
    
    /* Text */
    --text-primary: #1A1A1A;
    --text-secondary: #5A5A5A;
    --text-tertiary: #8A8A8A;
    --text-muted: #AAAAAA;
    --text-inverse: #FFFFFF;
    
    /* Semantic */
    --sent-bg: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    --received-bg: #FFFFFF;
    --border: #E0DDD8;
    --border-light: #F0EEEB;
    --shadow: rgba(0, 0, 0, 0.04);
    --shadow-hover: rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Radii */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
}

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    background: var(--bg-secondary);
    box-shadow: 0 0 60px var(--shadow);
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-light);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: var(--text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.new-chat-btn {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background: var(--primary);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    transition: all var(--transition-base);
}

.new-chat-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 102, 112, 0.3);
}

.new-chat-btn span {
    font-size: 1.2rem;
    font-weight: 400;
}

/* Conversations List */
.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--space-xs);
}

.conversation-item:hover {
    background: var(--bg-tertiary);
}

.conversation-item.active {
    background: var(--primary);
    color: var(--text-inverse);
}

.conversation-item.active .conversation-preview,
.conversation-item.active .conversation-time {
    color: rgba(255, 255, 255, 0.7);
}

.conversation-avatar {
    width: 48px;
    height: 48px;
    background: var(--accent);
    color: var(--text-inverse);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.conversation-item.active .conversation-avatar {
    background: var(--accent-light);
    color: var(--primary-dark);
}

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

.conversation-name {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: var(--space-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--space-xs);
}

.conversation-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.unread-badge {
    background: var(--accent);
    color: var(--text-inverse);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    min-width: 18px;
    text-align: center;
}

.conversation-item.active .unread-badge {
    background: var(--accent-light);
    color: var(--primary-dark);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--space-lg);
    border-top: 1px solid var(--border-light);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    color: var(--text-inverse);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
}

.user-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.user-status {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.user-status::before {
    content: '';
    width: 8px;
    height: 8px;
    background: #4CAF50;
    border-radius: var(--radius-full);
}

/* Chat Area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    min-width: 0;
}

/* Chat Header */
.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.chat-header-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.chat-avatar {
    width: 44px;
    height: 44px;
    background: var(--accent);
    color: var(--text-inverse);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
}

.chat-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.chat-name {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.chat-status {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 500;
}

.chat-actions {
    display: flex;
    gap: var(--space-sm);
}

.action-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: var(--bg-tertiary);
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.message-date {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin: var(--space-md) 0;
    position: relative;
}

.message-date::before,
.message-date::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 100px;
    height: 1px;
    background: var(--border);
}

.message-date::before {
    right: calc(50% + 50px);
}

.message-date::after {
    left: calc(50% + 50px);
}

/* Message Bubbles */
.message {
    display: flex;
    gap: var(--space-md);
    max-width: 70%;
    animation: messageSlide 0.3s ease;
}

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

.message.sent {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message.received {
    align-self: flex-start;
}

.message-avatar {
    width: 36px;
    height: 36px;
    background: var(--accent);
    color: var(--text-inverse);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
    align-self: flex-end;
}

.message-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.message.sent .message-content {
    align-items: flex-end;
}

.message-bubble {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-xl);
    max-width: 100%;
    word-wrap: break-word;
    box-shadow: 0 2px 8px var(--shadow);
}

.message.sent .message-bubble {
    background: var(--sent-bg);
    color: var(--text-inverse);
    border-bottom-right-radius: var(--radius-sm);
}

.message.received .message-bubble {
    background: var(--received-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    border-bottom-left-radius: var(--radius-sm);
}

.message-bubble p {
    margin: 0;
    line-height: 1.5;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    padding: 0 var(--space-sm);
}

.message.sent .message-time {
    color: var(--text-muted);
}

/* Chat Input Area */
.chat-input-area {
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.input-container {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    background: var(--bg-sidebar);
    border-radius: var(--radius-xl);
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border);
    transition: all var(--transition-fast);
}

.input-container:focus-within {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.input-btn:hover {
    background: var(--bg-tertiary);
}

.input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

#messageInput {
    flex: 1;
    border: none;
    background: transparent;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-primary);
    outline: none;
    padding: var(--space-sm) 0;
}

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

.send-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--primary);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.send-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 102, 112, 0.3);
}

.send-btn:active {
    transform: translateY(0);
}

.send-btn svg {
    stroke-width: 2.5;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Responsive */
@media (max-width: 900px) {
    .sidebar {
        width: 280px;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    
    .conversations-list {
        display: flex;
        overflow-x: auto;
        overflow-y: hidden;
        padding: var(--space-md);
        gap: var(--space-md);
    }
    
    .conversation-item {
        flex-direction: column;
        min-width: 80px;
        text-align: center;
        padding: var(--space-sm);
    }
    
    .conversation-info,
    .conversation-meta {
        display: none;
    }
    
    .message {
        max-width: 85%;
    }
    
    .chat-header {
        padding: var(--space-md);
    }
    
    .messages-container {
        padding: var(--space-md);
    }
    
    .chat-input-area {
        padding: var(--space-md);
    }
}

/* Typing Indicator Animation */
@keyframes typing {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--space-md) var(--space-lg);
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-tertiary);
    border-radius: var(--radius-full);
    animation: typing 1.4s infinite;
}

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

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