/* General Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    padding: 0;
    height: 100vh;
    overflow: hidden;
    transition: all 0.2s ease;
}

/* Smooth transitions for UI elements */
.conversation-item,
.message-item,
.message-bubble,
.btn,
input,
textarea {
    transition: all 0.2s ease;
}

/* Touch optimization for mobile */
.conversation-item,
.btn,
button {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

/* Ensure touch works properly always */
* {
    touch-action: manipulation;
}

body {
    touch-action: manipulation;
}

/* Image preview specific touch handling */
.image-preview-modal {
    touch-action: none; /* Only for the modal itself */
}

.image-preview-modal img {
    touch-action: auto; /* Allow zooming/panning on images */
}

.h-100 {
    height: 100vh !important;
}

/* Chat Page Layout */
.chat-page {
    height: 100vh;
    overflow: hidden;
}

.chat-page .container-fluid {
    height: 100vh;
    max-height: 100vh;
}

.chat-page .row {
    height: 100vh;
    max-height: 100vh;
}

.sidebar {
    background: white;
    border-right: 1px solid #e9ecef;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

/* Fix for all screen sizes 769px and above */
@media (min-width: 769px) {
    .chat-page .sidebar {
        display: flex !important;
        position: relative !important;
        height: 100vh !important;
        max-height: 100vh !important;
        width: 33.33333% !important;
        flex: 0 0 auto !important;
    }
    
    .chat-page .chat-area {
        display: block !important;
        height: 100vh !important;
        max-height: 100vh !important;
        width: 66.66667% !important;
        flex: 0 0 auto !important;
    }
    
    .chat-page .col-md-4 {
        width: 33.33333% !important;
        flex: 0 0 33.33333% !important;
    }
    
    .chat-page .col-md-8 {
        width: 66.66667% !important;
        flex: 0 0 66.66667% !important;
    }
}

/* Image Preview Modal (WhatsApp-like) */
.image-preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-preview-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-preview-container {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.image-preview-close {
    position: absolute;
    top: -50px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    z-index: 10000;
    padding: 10px;
}

.image-preview-close:hover {
    color: #ccc;
}

.image-preview-image {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 8px;
}

.image-preview-actions {
    margin-top: 20px;
    display: flex;
    gap: 10px;
}

/* Message Status Icons (Double Blue Tick) */
.message-status {
    margin-left: 5px;
    font-size: 12px;
}

.message-status.sent {
    color: #95a5a6;
}

.message-status.delivered {
    color: #95a5a6;
}

.message-status.seen {
    color: #25d366; /* WhatsApp blue tick color */
}

/* Image Message Styling */
.image-message {
    position: relative;
    cursor: pointer;
    border-radius: 12px;
    overflow: hidden;
    max-width: 280px;
}

.message-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    transition: all 0.3s ease;
    opacity: 0;
}

.image-message:hover .image-overlay {
    background: rgba(0, 0, 0, 0.3);
    opacity: 1;
}

/* Also fix the md-4 and md-8 at exactly 768px */
@media (min-width: 768px) and (max-width: 768px) {
    .chat-page .sidebar {
        display: flex !important;
        position: relative !important;
        height: 100vh !important;
    }
    
    .chat-page .chat-area {
        display: block !important;
        height: 100vh !important;
    }
}

.sidebar-header {
    background: #25d366;
    color: white;
    padding: 1rem;
    flex-shrink: 0;
}

.search-box {
    padding: 0.5rem;
    flex-shrink: 0;
    background: #f0f2f5;
}

.new-chat-btn {
    padding: 0.5rem;
    flex-shrink: 0;
    background: #f0f2f5;
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
}

/* Mobile First Approach */
html {
    font-size: 16px;
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
}

/* Landing Page */
.landing-page {
    background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
    color: white;
    overflow: auto;
    min-height: 100vh;
}

.landing-content {
    max-width: 500px;
    padding: 1rem;
}

.logo {
    width: 120px;
    height: 120px;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
}

.logo-small {
    width: 60px;
    height: 60px;
}

.feature-item {
    justify-content: flex-start;
    text-align: left;
    font-size: 1.1rem;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: #000;
    border-radius: 30px;
    padding: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 20px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chat-header {
    background: #25d366;
    color: white;
    padding: 15px;
    flex-shrink: 0;
}

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.message {
    margin-bottom: 15px;
}

.message.sent {
    text-align: right;
}

.message-bubble {
    display: inline-block;
    padding: 8px 12px;
    border-radius: 18px;
    max-width: 80%;
    word-wrap: break-word;
}

.message.received .message-bubble {
    background: #f1f1f1;
    color: #333;
}

.message.sent .message-bubble {
    background: #dcf8c6;
    color: #333;
}

/* Register Page */
.register-page {
    background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
    overflow: auto;
    min-height: 100vh;
    padding: 1rem;
}

.register-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.conversation-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #e9ecef;
    cursor: pointer;
    transition: all 0.15s ease;
    position: relative;
}

.conversation-item:hover {
    background-color: #f8f9fa;
    transform: translateX(2px);
}

.conversation-item.active {
    background-color: #e3f2fd;
    border-left: 4px solid #25d366;
    transform: translateX(4px);
}

.conversation-item:active {
    transform: scale(0.98);
}

.chat-area {
    background: #e5ddd5;
    height: 100vh;
    position: relative;
    width: 100%;
}

.welcome-screen {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="%23ffffff" opacity="0.1"/></svg>') repeat;
}

.chat-container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.chat-header {
    background: #25d366;
    color: white;
    padding: 1rem;
    flex-shrink: 0;
    border-bottom: 1px solid #128c7e;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    background: #e5ddd5;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.05"/></svg>');
}

.chat-input {
    background: #f0f2f5;
    padding: 0.75rem 1rem;
    flex-shrink: 0;
}

.chat-input-toolbar {
    display: flex;
    align-items: center;
}

.message-item {
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-end;
}

.message-item.sent {
    justify-content: flex-end;
}

.message-content {
    max-width: 70%;
    position: relative;
}

.message-bubble {
    padding: 8px 12px;
    border-radius: 18px;
    word-wrap: break-word;
    position: relative;
}

.message-item.received .message-bubble {
    background: white;
    color: #333;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.message-item.sent .message-bubble {
    background: #dcf8c6;
    color: #333;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.message-time {
    font-size: 0.75rem;
    color: #666;
    margin-top: 4px;
    text-align: right;
}

.message-status {
    margin-left: 4px;
}

.message-status.sent {
    color: #999;
}

.message-status.delivered {
    color: #4fc3f7;
}

.message-status.seen {
    color: #25d366;
}

/* File Message Styles */
.file-message {
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 12px;
    padding: 12px;
    max-width: 300px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.file-message:hover {
    background-color: #f8f9fa;
}

.file-message.sent {
    background: #dcf8c6;
    border-color: #c5d9a5;
}

.file-info {
    display: flex;
    align-items: center;
}

.file-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    margin-right: 12px;
    font-size: 1.2rem;
}

.file-icon.pdf {
    background: #ff6b6b;
    color: white;
}

.file-icon.image {
    background: #4ecdc4;
    color: white;
}

.file-icon.audio {
    background: #45b7d1;
    color: white;
}

.file-icon.video {
    background: #f9ca24;
    color: white;
}

.file-icon.document {
    background: #6c5ce7;
    color: white;
}

.file-icon.archive {
    background: #fd79a8;
    color: white;
}

.file-icon.default {
    background: #74b9ff;
    color: white;
}

.file-details {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 500;
    margin-bottom: 2px;
    word-wrap: break-word;
    font-size: 0.9rem;
}

.file-size {
    color: #666;
    font-size: 0.8rem;
}

/* Audio Message Styles */
.audio-message {
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 18px;
    padding: 8px 12px;
    max-width: 250px;
    display: flex;
    align-items: center;
}

.audio-message.sent {
    background: #dcf8c6;
    border-color: #c5d9a5;
}

.audio-controls {
    display: flex;
    align-items: center;
}

.audio-play-btn {
    background: #25d366;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    margin-right: 8px;
}

.audio-play-btn:hover {
    background: #128c7e;
}

.audio-duration {
    font-size: 0.8rem;
    color: #666;
}

.audio-waveform {
    width: 80px;
    height: 20px;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 80 20"><rect x="2" y="8" width="2" height="4" fill="%23666"/><rect x="6" y="6" width="2" height="8" fill="%23666"/><rect x="10" y="10" width="2" height="0" fill="%23666"/><rect x="14" y="7" width="2" height="6" fill="%23666"/><rect x="18" y="9" width="2" height="2" fill="%23666"/><rect x="22" y="5" width="2" height="10" fill="%23666"/><rect x="26" y="8" width="2" height="4" fill="%23666"/><rect x="30" y="6" width="2" height="8" fill="%23666"/><rect x="34" y="9" width="2" height="2" fill="%23666"/><rect x="38" y="7" width="2" height="6" fill="%23666"/><rect x="42" y="8" width="2" height="4" fill="%23666"/><rect x="46" y="5" width="2" height="10" fill="%23666"/><rect x="50" y="9" width="2" height="2" fill="%23666"/><rect x="54" y="6" width="2" height="8" fill="%23666"/><rect x="58" y="8" width="2" height="4" fill="%23666"/><rect x="62" y="7" width="2" height="6" fill="%23666"/><rect x="66" y="9" width="2" height="2" fill="%23666"/><rect x="70" y="6" width="2" height="8" fill="%23666"/><rect x="74" y="8" width="2" height="4" fill="%23666"/></svg>') no-repeat center;
    margin: 0 8px;
}

/* Image Message Styles */
.image-message {
    border-radius: 12px;
    overflow: hidden;
    max-width: 200px;
    cursor: pointer;
}

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

/* Audio Recording UI */
.audio-recording-ui {
    margin-bottom: 0.75rem;
}

.recording-indicator {
    animation: pulse 1.5s ease-in-out infinite alternate;
}

@keyframes pulse {
    from { opacity: 0.5; }
    to { opacity: 1; }
}

/* Avatar Styles */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1rem;
}

.avatar-large {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 2rem;
}

.online-indicator {
    width: 12px;
    height: 12px;
    background: #25d366;
    border: 2px solid white;
    border-radius: 50%;
    position: absolute;
    bottom: 0;
    right: 0;
}

/* Settings Page */
.settings-page {
    background: #f0f2f5;
    min-height: 100vh;
    padding: 2rem 0;
}

.settings-section {
    margin-bottom: 2rem;
}

.setting-item {
    padding: 1rem 0;
    border-bottom: 1px solid #e9ecef;
}

.setting-item:last-child {
    border-bottom: none;
}

/* File Upload Progress */
.upload-progress {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 8px;
    border: 1px solid #e9ecef;
}

.progress-bar-custom {
    height: 4px;
    background: #25d366;
    border-radius: 2px;
    transition: width 0.3s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        overflow-y: auto;
        overflow-x: hidden;
    }
    
    .h-100 {
        min-height: 100vh;
        height: auto;
    }
    
    /* Mobile Chat Layout */
    .chat-page .row {
        height: 100vh;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        width: 85%;
        max-width: 320px;
        z-index: 1050;
        transition: left 0.3s ease;
        box-shadow: 0 0 20px rgba(0,0,0,0.3);
    }
    
    .sidebar.show {
        left: 0;
    }
    
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);
        z-index: 1040;
        display: none;
    }
    
    .sidebar-overlay.show {
        display: block;
    }
    
    .chat-area {
        width: 100%;
        position: relative;
    }
    
    .mobile-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        background: #25d366;
        color: white;
        padding: 0.75rem 1rem;
        position: sticky;
        top: 0;
        z-index: 100;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }
    
    .mobile-menu-btn {
        background: none;
        border: none;
        color: white;
        font-size: 1.2rem;
        cursor: pointer;
    }
    
    /* Landing Page Mobile */
    .phone-mockup {
        display: none;
    }
    
    .landing-content {
        padding: 2rem 1rem;
    }
    
    .feature-item {
        font-size: 1rem;
        margin-bottom: 1rem;
    }
    
    /* Register Page Mobile */
    .register-card {
        padding: 1.5rem;
        margin: 1rem;
        border-radius: 10px;
    }
    
    /* Chat Messages Mobile */
    .message-content {
        max-width: 85%;
    }
    
    .file-message {
        max-width: 250px;
    }
    
    .audio-message {
        max-width: 200px;
    }
    
    .image-message {
        max-width: 180px;
    }
    
    .chat-input-toolbar {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}

/* Tablet adjustments */
@media (min-width: 769px) and (max-width: 991px) {
    .file-message {
        max-width: 350px;
    }
    
    .message-content {
        max-width: 75%;
    }
}

/* Large screen adjustments */
@media (min-width: 1200px) {
    .file-message {
        max-width: 400px;
    }
    
    .message-content {
        max-width: 65%;
    }
}

/* Additional file type icons */
.file-icon.apk {
    background: #a4c639;
    color: white;
}

.file-icon.exe {
    background: #0078d4;
    color: white;
}

.file-icon.zip {
    background: #fd79a8;
    color: white;
}

/* Hover effects for interactive elements */
.message-item:hover .file-message {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.audio-play-btn:active {
    transform: scale(0.95);
}

/* Loading states */
.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid #ccc;
    border-radius: 50%;
    border-top-color: #25d366;
    animation: spin 1s ease-in-out infinite;
}

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

/* Error states */
.error-message {
    color: #dc3545;
    font-size: 0.8rem;
    margin-top: 4px;
}

/* Success states */
.success-message {
    color: #28a745;
    font-size: 0.8rem;
    margin-top: 4px;
}