/* CSS Variables for Nature Theme */
:root {
    /* Color Palette */
    --primary-green: #2ecc71;
    --forest-green: #27ae60;
    --emerald: #1abc9c;
    --sky-blue: #3498db;
    --deep-blue: #2980b9;
    --sunset-orange: #e67e22;
    --earth-brown: #8b4513;
    --wood-brown: #a0522d;
    --moss-green: #8fbc8f;
    --river-blue: #5dade2;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --glass-blur: blur(10px);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    min-height: 100vh;
    overflow-x: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
}

/* Nature Background Canvas */
#nature-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Floating Elements Container */
.floating-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

/* Glassmorphism Base */
.glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* Main Layout */
.messenger-app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

/* Header Styles */
.app-header {
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.9), rgba(39, 174, 96, 0.9));
    color: white;
    position: relative;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--forest-green);
    font-size: 20px;
    font-weight: bold;
}

.logo-text {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

/* User Info */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 45px;
    height: 45px;
    border-radius: var(--radius-full);
    border: 2px solid white;
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-medium);
}

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

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-name {
    font-weight: 500;
    font-size: 16px;
}

.user-status {
    font-size: 14px;
    opacity: 0.9;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: #2ecc71;
}

.status-dot.offline {
    background: #95a5a6;
}

/* Main Content Area */
.main-content {
    display: flex;
    flex: 1;
    min-height: calc(100vh - 80px);
    position: relative;
}

/* Sidebar - Friends List */
.sidebar {
    width: 320px;
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.05);
}

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

.search-box {
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-md) 45px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    color: white;
    font-size: 14px;
    transition: all var(--transition-medium);
}

.search-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.25);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: rgba(255, 255, 255, 0.7);
}

/* Friends List */
.friends-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.friend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-medium);
    margin-bottom: var(--spacing-sm);
}

.friend-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.friend-item.active {
    background: rgba(52, 152, 219, 0.2);
    border-left: 3px solid var(--sky-blue);
}

.friend-avatar {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.friend-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.friend-status {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    border: 2px solid white;
    background: #2ecc71;
}

.friend-status.away {
    background: #f39c12;
}

.friend-status.offline {
    background: #95a5a6;
}

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

.friend-name {
    font-weight: 500;
    color: white;
    margin-bottom: var(--spacing-xs);
    font-size: 15px;
}

.last-message {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.7);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.message-time {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: var(--spacing-xs);
}

.unread-count {
    background: var(--primary-green);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 600;
}

/* Chat Area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.03);
}

.chat-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.05);
}

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

.current-chat-avatar {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.current-chat-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.chat-user-name {
    font-size: 18px;
    font-weight: 600;
    color: white;
}

.chat-user-status {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.chat-action-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-medium);
}

.chat-action-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

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

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

.message-group-date {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 12px;
    margin: var(--spacing-md) 0;
    position: relative;
}

.message-group-date::before,
.message-group-date::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 30%;
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
}

.message-group-date::before {
    left: 0;
}

.message-group-date::after {
    right: 0;
}

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

@keyframes messageAppear {
    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: 35px;
    height: 35px;
    border-radius: var(--radius-full);
    overflow: hidden;
    flex-shrink: 0;
    margin-top: 5px;
}

.message-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.message-bubble {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    position: relative;
    word-wrap: break-word;
    min-width: 60px;
}

.message.sent .message-bubble {
    background: linear-gradient(135deg, var(--sky-blue), var(--deep-blue));
    color: white;
    border-bottom-right-radius: var(--radius-xs);
}

.message.received .message-bubble {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-bottom-left-radius: var(--radius-xs);
}

.message-text {
    line-height: 1.4;
    font-size: 14px;
}

.message-text a {
    color: var(--river-blue);
    text-decoration: underline;
}

.message-image {
    max-width: 300px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: var(--spacing-xs);
}

.message-image img {
    width: 100%;
    height: auto;
    display: block;
    cursor: pointer;
}

.message-time {
    font-size: 11px;
    opacity: 0.7;
    margin-top: var(--spacing-xs);
    text-align: right;
}

.message-status {
    display: inline-flex;
    margin-left: var(--spacing-xs);
    font-size: 12px;
}

/* Message Reactions */
.message-reactions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    flex-wrap: wrap;
}

.reaction {
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    padding: 2px 6px;
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.reaction:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.1);
}

.reaction-count {
    margin-left: 2px;
    font-size: 11px;
    opacity: 0.8;
}

/* Message Input Area */
.message-input-area {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.05);
}

.input-container {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.attachment-buttons {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.attachment-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-medium);
}

.attachment-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.message-input-wrapper {
    flex: 1;
    position: relative;
}

#message-input {
    width: 100%;
    min-height: 50px;
    max-height: 150px;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    color: white;
    font-size: 14px;
    resize: none;
    transition: all var(--transition-medium);
}

#message-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

#message-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.emoji-picker-btn {
    position: absolute;
    right: var(--spacing-md);
    bottom: var(--spacing-md);
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    font-size: 20px;
    transition: color var(--transition-medium);
}

.emoji-picker-btn:hover {
    color: white;
}

.send-button {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-green), var(--forest-green));
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: all var(--transition-medium);
}

.send-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(46, 204, 113, 0.4);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Emoji Picker */
.emoji-picker {
    position: absolute;
    bottom: 100%;
    right: 0;
    width: 300px;
    background: rgba(30, 30, 40, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    padding: var(--spacing-md);
    z-index: 1000;
    display: none;
}

.emoji-picker.active {
    display: block;
    animation: slideUp 0.3s ease;
}

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

.emoji-categories {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.emoji-category-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    font-size: 20px;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
}

.emoji-category-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: var(--spacing-sm);
    max-height: 200px;
    overflow-y: auto;
}

.emoji-item {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.emoji-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
}

/* Stories Container */
.stories-container {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.03);
}

.stories-title {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stories-list {
    display: flex;
    gap: var(--spacing-md);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
}

.story-item {
    width: 80px;
    flex-shrink: 0;
    cursor: pointer;
}

.story-avatar {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
    margin: 0 auto;
    border: 2px solid transparent;
    background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
    padding: 2px;
}

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

.story-avatar.has-story::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: var(--primary-green);
    border-radius: var(--radius-full);
}

.story-name {
    text-align: center;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }
    
    .message {
        max-width: 80%;
    }
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: 300px;
        border-right: none;
        border-bottom: 1px solid var(--glass-border);
    }
    
    .messages-container {
        padding: var(--spacing-md);
    }
    
    .message {
        max-width: 85%;
    }
    
    .emoji-picker {
        width: 250px;
    }
    
    .emoji-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

@media (max-width: 480px) {
    .app-header {
        padding: var(--spacing-sm);
    }
    
    .logo-text {
        font-size: 18px;
    }
    
    .user-name {
        display: none;
    }
    
    .chat-header {
        padding: var(--spacing-md);
    }
    
    .message-input-area {
        padding: var(--spacing-md);
    }
    
    .message {
        max-width: 90%;
    }
    
    .stories-container {
        padding: var(--spacing-sm);
    }
    
    .story-item {
        width: 65px;
    }
    
    .story-avatar {
        width: 55px;
        height: 55px;
    }
}

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

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid var(--primary-green);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    width: fit-content;
    margin: var(--spacing-xs) 0;
}

.typing-dot {
    width: 6px;
    height: 6px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-full);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}