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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0e0e10 0%, #1a1a1d 50%, #16161a 100%);
    color: #efeff1;
    overflow: hidden;
    font-feature-settings: 'kern' 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(20px);
}

/* Header */
.header {
    background: rgba(24, 24, 27, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(70, 70, 73, 0.3);
    padding: 16px 24px;
    flex-shrink: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.3s ease;
}

.logo:hover {
    transform: translateY(-1px);
}

.logo i {
    font-size: 32px;
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 4px rgba(145, 70, 255, 0.3));
}

.logo h1 {
    font-size: 22px;
    font-weight: 700;
    color: #efeff1;
    letter-spacing: -0.02em;
}

.header-stats {
    display: flex;
    gap: 32px;
}

.stat {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: #adadb8;
    padding: 8px 16px;
    background: rgba(145, 70, 255, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(145, 70, 255, 0.2);
    transition: all 0.3s ease;
}

.stat:hover {
    background: rgba(145, 70, 255, 0.15);
    transform: translateY(-1px);
}

.stat i {
    color: #9146ff;
    filter: drop-shadow(0 0 8px rgba(145, 70, 255, 0.4));
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: rgba(24, 24, 27, 0.8);
    backdrop-filter: blur(20px);
    border-right: 1px solid rgba(70, 70, 73, 0.3);
    padding: 24px;
    overflow-y: auto;
    flex-shrink: 0;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
}

.sidebar h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    font-weight: 600;
    color: #efeff1;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    position: relative;
}

.sidebar h3::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, #9146ff, transparent);
    border-radius: 1px;
}

.sidebar h3 i {
    color: #9146ff;
    filter: drop-shadow(0 0 8px rgba(145, 70, 255, 0.4));
}

/* File Upload Section */
.file-upload-section {
    margin-bottom: 40px;
}

.upload-area {
    border: 2px dashed rgba(145, 70, 255, 0.3);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    background: rgba(145, 70, 255, 0.02);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(145, 70, 255, 0.1), transparent);
    transition: left 0.6s ease;
}

.upload-area:hover::before {
    left: 100%;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: #9146ff;
    background: rgba(145, 70, 255, 0.08);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(145, 70, 255, 0.2);
}

.upload-content i {
    font-size: 40px;
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    filter: drop-shadow(0 2px 8px rgba(145, 70, 255, 0.3));
}

.upload-content p {
    color: #c9c9d3;
    margin-bottom: 8px;
    font-size: 15px;
    font-weight: 500;
}

.upload-content .conversion-note {
    color: #8b8b9c;
    font-size: 12px;
    font-style: italic;
    margin-bottom: 12px;
    opacity: 0.8;
}

.upload-btn {
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 16px;
    box-shadow: 0 4px 16px rgba(145, 70, 255, 0.3);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(145, 70, 255, 0.4);
}

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

/* Channels Section */
.channels-section {
    margin-bottom: 40px;
}

.search-box {
    position: relative;
    margin-bottom: 20px;
}

.search-box i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: #9146ff;
    font-size: 14px;
    z-index: 2;
}

.search-box input {
    width: 100%;
    background: rgba(38, 38, 44, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(145, 70, 255, 0.2);
    border-radius: 12px;
    padding: 12px 16px 12px 44px;
    color: #efeff1;
    font-size: 14px;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: #9146ff;
    box-shadow: 0 0 0 3px rgba(145, 70, 255, 0.1);
    background: rgba(38, 38, 44, 0.95);
}

.search-box input::placeholder {
    color: #6c6c7c;
}

.channels-list {
    max-height: 240px;
    overflow-y: auto;
    padding-right: 4px;
}

.channel-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 14px;
    margin-bottom: 4px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid transparent;
}

.channel-item:hover {
    background: rgba(145, 70, 255, 0.08);
    border-color: rgba(145, 70, 255, 0.2);
    transform: translateX(4px);
}

.channel-item.active {
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(145, 70, 255, 0.3);
    transform: translateX(4px);
}

.channel-name {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.channel-name i {
    color: #9146ff;
    font-size: 12px;
    transition: all 0.3s ease;
}

.channel-item.active .channel-name i {
    color: white;
    filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.5));
}

.message-count {
    background: rgba(70, 70, 73, 0.6);
    color: #adadb8;
    padding: 4px 8px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.channel-item.active .message-count {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    backdrop-filter: blur(10px);
}

.no-data {
    text-align: center;
    color: #adadb8;
    font-size: 14px;
    padding: 24px;
}

/* Filters Section */
.filters-section h3 {
    margin-bottom: 16px;
}

.filter-group {
    margin-bottom: 20px;
    padding: 16px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.02) 0%, rgba(255, 255, 255, 0.05) 100%);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.filter-group:hover {
    border-color: rgba(145, 70, 255, 0.3);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
}

.filter-group label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: #c9c9d3;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.filter-group input {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 12px 16px;
    color: #efeff1;
    font-size: 14px;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-sizing: border-box;
}

.filter-group input:focus {
    outline: none;
    border-color: #9146ff;
    box-shadow: 0 0 0 3px rgba(145, 70, 255, 0.2);
    background: rgba(0, 0, 0, 0.5);
    transform: scale(1.02);
}

/* Special styling for date inputs */
.filter-group input[type="date"] {
    width: 100%;
    padding: 8px 12px;
    background-color: #18181b;
    border: 1px solid #3f3f46;
    border-radius: 4px;
    color: #efeff1;
    font-size: 14px;
    font-family: inherit;
    box-sizing: border-box;
}

.filter-group input[type="date"]:focus {
    outline: none;
    border-color: #9146ff;
}

.filter-group input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}

/* Style the calendar dropdown text elements */
.filter-group input[type="date"]::-webkit-datetime-edit {
    color: #efeff1;
}

.filter-group input[type="date"]::-webkit-datetime-edit-fields-wrapper {
    padding: 0;
}

.filter-group input[type="date"]::-webkit-datetime-edit-text {
    color: #adadb8;
}

.filter-group input[type="date"]::-webkit-datetime-edit-month-field,
.filter-group input[type="date"]::-webkit-datetime-edit-day-field,
.filter-group input[type="date"]::-webkit-datetime-edit-year-field {
    color: #efeff1;
}

/* For Firefox */
.filter-group input[type="date"]::-moz-color-swatch {
    border: none;
}

/* Help text for date inputs */
.input-help {
    display: block;
    font-size: 11px;
    color: #6c6c7c;
    margin-top: 4px;
    font-style: italic;
}

/* Global Date Picker Theme Override */
input[type="date"] {
    color-scheme: dark;
}

.apply-filters-btn,
.clear-filters-btn {
    width: 100%;
    padding: 12px 20px;
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.3px;
}

.apply-filters-btn {
    background: linear-gradient(135deg, #00ad36 0%, #00d43e 100%);
    color: white;
    border: 1px solid rgba(0, 173, 54, 0.3);
    box-shadow: 0 4px 16px rgba(0, 173, 54, 0.3);
}

.apply-filters-btn:hover {
    background: linear-gradient(135deg, #00952e 0%, #00bb36 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 173, 54, 0.4);
}

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

.clear-filters-btn {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    color: #c9c9d3;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.clear-filters-btn:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    color: #efeff1;
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

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

/* Chat Area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: rgba(14, 14, 16, 0.6);
    backdrop-filter: blur(20px);
}

.chat-header {
    background: rgba(24, 24, 27, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(70, 70, 73, 0.3);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.1);
}

.active-channel {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.active-channel i {
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 8px rgba(145, 70, 255, 0.4));
}

.chat-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-messages {
    position: relative;
}

.search-messages i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: #9146ff;
    font-size: 14px;
    z-index: 2;
}

.search-messages input {
    width: 280px;
    background: rgba(38, 38, 44, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(145, 70, 255, 0.2);
    border-radius: 12px;
    padding: 12px 16px 12px 44px;
    color: #efeff1;
    font-size: 14px;
    transition: all 0.3s ease;
}

.search-messages input:focus {
    outline: none;
    border-color: #9146ff;
    box-shadow: 0 0 0 3px rgba(145, 70, 255, 0.1);
    background: rgba(38, 38, 44, 0.95);
}

.search-messages input::placeholder {
    color: #6c6c7c;
}

.scroll-to-bottom {
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 16px rgba(145, 70, 255, 0.3);
}

.scroll-to-bottom:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(145, 70, 255, 0.4);
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 0;
}

.welcome-message {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.welcome-content {
    text-align: center;
    max-width: 500px;
}

.welcome-content i {
    font-size: 64px;
    color: #9146ff;
    margin-bottom: 24px;
}

.welcome-content h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    color: #efeff1;
}

.welcome-content > p {
    font-size: 16px;
    color: #adadb8;
    margin-bottom: 32px;
    line-height: 1.5;
}

.feature-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background-color: #18181b;
    border-radius: 8px;
    border: 1px solid #464649;
}

.feature i {
    color: #9146ff;
    font-size: 18px;
}

.feature span {
    color: #efeff1;
    font-size: 14px;
    font-weight: 500;
}

/* Message Styles */
.message {
    display: flex;
    padding: 8px 24px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 3px solid transparent;
    margin-bottom: 2px;
    border-radius: 0 8px 8px 0;
}

.message:hover {
    background: rgba(255, 255, 255, 0.03);
    border-left-color: rgba(145, 70, 255, 0.3);
    transform: translateX(2px);
}

.message.highlighted {
    background: rgba(145, 70, 255, 0.15);
    border-left-color: #9146ff;
    box-shadow: 0 0 20px rgba(145, 70, 255, 0.2);
    transform: translateX(4px);
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 4px;
}

.username {
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.username:hover {
    filter: brightness(1.2);
    text-shadow: 0 0 8px currentColor;
}

.timestamp {
    font-size: 11px;
    color: #8b8b9a;
    font-weight: 500;
    opacity: 0.8;
}

.channel-tag {
    background: rgba(145, 70, 255, 0.2);
    color: #9146ff;
    padding: 3px 8px;
    border-radius: 8px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(145, 70, 255, 0.3);
}

.message-text {
    font-size: 14px;
    line-height: 1.5;
    color: #efeff1;
    word-wrap: break-word;
    white-space: pre-wrap;
    font-weight: 400;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    text-align: center;
    color: #efeff1;
    background: rgba(24, 24, 27, 0.9);
    backdrop-filter: blur(20px);
    padding: 40px;
    border-radius: 24px;
    border: 1px solid rgba(145, 70, 255, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.loading-spinner i {
    font-size: 56px;
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    filter: drop-shadow(0 4px 12px rgba(145, 70, 255, 0.4));
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.loading-spinner p {
    font-size: 16px;
    color: #c9c9d3;
    font-weight: 500;
    margin: 0;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background: linear-gradient(135deg, rgba(24, 24, 27, 0.95) 0%, rgba(39, 39, 42, 0.95) 100%);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.4);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
}

.modal-header h3 {
    color: #efeff1;
    font-size: 16px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: 0.3px;
}

.modal-header h3 i {
    color: #ff6b6b;
    font-size: 18px;
    filter: drop-shadow(0 2px 8px rgba(255, 107, 107, 0.3));
}

.close-modal {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #c9c9d3;
    font-size: 16px;
    cursor: pointer;
    padding: 8px;
    border-radius: 10px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-modal:hover {
    color: #efeff1;
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.modal-body {
    padding: 24px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.02) 0%, transparent 100%);
}

.modal-body p {
    color: #adadb8;
    line-height: 1.5;
}

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: right;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.02) 0%, rgba(255, 255, 255, 0.05) 100%);
}

.btn-primary {
    background: linear-gradient(135deg, #9146ff 0%, #a855f7 100%);
    color: white;
    border: 1px solid rgba(145, 70, 255, 0.3);
    padding: 12px 20px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 16px rgba(145, 70, 255, 0.3);
    letter-spacing: 0.3px;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #772ce8 0%, #9333ea 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(145, 70, 255, 0.4);
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(24, 24, 27, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, rgba(145, 70, 255, 0.3) 0%, rgba(168, 85, 247, 0.3) 100%);
    border-radius: 4px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, rgba(145, 70, 255, 0.5) 0%, rgba(168, 85, 247, 0.5) 100%);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 250px;
        backdrop-filter: blur(30px);
    }
    
    .search-messages input {
        width: 200px;
    }
    
    .header-stats {
        display: none;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .filter-group {
        padding: 12px;
    }
    
    .loading-spinner {
        padding: 30px;
    }
}

@media (max-width: 640px) {
    .sidebar {
        position: absolute;
        left: -280px;
        top: 0;
        height: 100%;
        z-index: 100;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        backdrop-filter: blur(30px);
        box-shadow: 20px 0 60px rgba(0, 0, 0, 0.3);
    }
    
    .sidebar.show {
        left: 0;
    }
    
    .search-messages input {
        width: 150px;
    }
    
    .chat-controls {
        gap: 8px;
    }
    
    .modal {
        width: 95%;
        margin: 20px;
    }
    
    .loading-spinner {
        padding: 20px;
        margin: 20px;
    }
    
    .filter-group {
        margin-bottom: 16px;
        padding: 12px;
    }
}