:root {
    /* Серьезная темная тема (Deep Dark) */
    --glass-bg: rgba(13, 14, 18, 0.85);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
    --text-color: #f0f0f0;
    --text-muted: rgba(255, 255, 255, 0.4);
    --accent-color: #3b82f6; 
    --accent-glow: rgba(59, 130, 246, 0.3);
    --bg-gradient: linear-gradient(135deg, #09090b 0%, #111114 50%, #09090b 100%);
    --msg-sent-bg: rgba(59, 130, 246, 0.15);
    --msg-received-bg: rgba(255, 255, 255, 0.02);
    --card-bg: rgba(255, 255, 255, 0.015);
    --card-hover: rgba(255, 255, 255, 0.04);
    --input-bg: rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
    --glass-bg: rgba(248, 250, 252, 0.85);
    --glass-border: rgba(0, 0, 0, 0.06);
    --glass-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
    --text-color: #0f172a;
    --text-muted: rgba(15, 23, 42, 0.5);
    --accent-color: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.15);
    --bg-gradient: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    --msg-sent-bg: rgba(37, 99, 235, 0.1);
    --msg-received-bg: rgba(0, 0, 0, 0.04);
    --card-bg: rgba(0, 0, 0, 0.01);
    --card-hover: rgba(0, 0, 0, 0.02);
    --input-bg: rgba(255, 255, 255, 0.9);
}

[data-theme="midnight"] {
    --glass-bg: rgba(5, 5, 5, 0.98);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-shadow: 0 0 50px rgba(0, 0, 0, 1);
    --text-color: #ffffff;
    --text-muted: #444444;
    --accent-color: #ffffff;
    --accent-glow: rgba(255, 255, 255, 0.05);
    --bg-gradient: #000000;
    --msg-sent-bg: rgba(255, 255, 255, 0.08);
    --msg-received-bg: rgba(255, 255, 255, 0.03);
    --card-bg: rgba(255, 255, 255, 0.02);
    --card-hover: rgba(255, 255, 255, 0.05);
    --input-bg: #050505;
}

[data-theme="midnight"] body {
    background: #000000 !important;
}

body {
    background: var(--bg-gradient);
    background-attachment: fixed;
    height: 100vh;
    margin: 0;
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    color: var(--text-color);
    transition: background 0.5s cubic-bezier(0.4, 0, 0.2, 1), color 0.5s ease, backdrop-filter 0.5s ease;
    overflow-x: hidden;
}

* {
    transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(25px) saturate(180%);
    -webkit-backdrop-filter: blur(25px) saturate(180%);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    padding: 2.5rem;
    animation: fadeIn 0.6s ease-out;
    transition: transform 0.3s ease, background 0.5s ease;
}

/* Адаптивность для телефонов */
@media (max-width: 768px) {
    .container {
        padding-left: 10px;
        padding-right: 10px;
        max-width: 100%;
    }
    .glass-container {
        padding: 1.2rem;
        border-radius: 18px;
    }
    .message {
        max-width: 85%;
    }
    .avatar-img {
        width: 45px;
        height: 45px;
    }
    h2, h4 { font-size: 1.2rem; }
}

.chat-image, .chat-video {
    max-width: 100%;
    border-radius: 12px;
    margin-top: 5px;
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.2s ease;
    border: 1px solid var(--glass-border);
    background: rgba(0,0,0,0.1);
}

.chat-image:hover, .chat-video:hover {
    transform: scale(1.01);
    opacity: 0.9;
}

/* Модальное окно (Lightbox) */
#media-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

#modal-content {
    max-width: 90%;
    max-height: 90%;
    border-radius: 12px;
    box-shadow: 0 0 30px rgba(0,0,0,0.5);
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 30px;
    color: white;
    font-size: 40px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.close-modal:hover {
    transform: scale(1.2);
}

/* Видео в профиле */
.profile-vid-container {
    max-width: 400px;
    margin: 0 auto;
    border-radius: 20px;
    overflow: hidden;
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 20px var(--accent-glow);
    background: black;
}

.profile-vid {
    width: 100%;
    display: block;
}

    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    transition: all 0.25s ease;
    cursor: pointer;
    margin-bottom: 0.8rem;
    padding: 1.1rem;
    display: flex;
    align-items: center;
    color: var(--text-color);
    text-decoration: none;
}

.glass-card:hover {
    background: var(--card-hover);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.12);
    text-decoration: none;
    color: var(--text-color);
}

.btn-glass {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    backdrop-filter: blur(8px);
    border-radius: 12px;
    padding: 10px 18px;
    transition: all 0.2s ease;
    font-weight: 500;
}

.btn-glass:hover {
    background: var(--card-hover);
    transform: translateY(-1px);
    color: var(--text-color);
    border-color: var(--accent-color);
}

input.glass-input, .custom-file-label.glass-input {
    background: var(--input-bg) !important;
    border: 1px solid var(--glass-border) !important;
    color: var(--text-color) !important;
    border-radius: 12px;
    padding: 12px 16px;
    transition: all 0.2s ease;
}

input.glass-input:focus {
    border-color: var(--accent-color) !important;
    box-shadow: 0 0 0 3px var(--accent-glow) !important;
    outline: none;
}

.avatar-img {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 15px;
    border: 1.5px solid var(--glass-border);
    flex-shrink: 0;
}

.badge-unread {
    background: var(--accent-color);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 8px;
    min-width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.message {
    max-width: 75%;
    margin-bottom: 0.7rem;
    padding: 0.7rem 1.1rem;
    border-radius: 16px;
    position: relative;
    font-size: 0.92rem;
}

.message.sent {
    align-self: flex-end;
    background: var(--msg-sent-bg);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-bottom-right-radius: 4px;
}

.message.received {
    align-self: flex-start;
    background: var(--msg-received-bg);
    border: 1px solid var(--glass-border);
    border-bottom-left-radius: 4px;
}

.message-time {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 4px;
    text-align: right;
}

.chat-box {
    height: 65vh;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.chat-image {
    max-width: 100%;
    border-radius: 12px;
    margin-top: 5px;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.chat-image:hover {
    opacity: 0.9;
}

.download-link {
    display: block;
    font-size: 0.7rem;
    color: var(--accent-color);
    margin-top: 6px;
    font-weight: 500;
}

.typing-dot {
    width: 4px;
    height: 4px;
    background: var(--text-color);
    border-radius: 50%;
    display: inline-block;
    margin-right: 2px;
    opacity: 0.5;
    animation: typingAnimation 1.4s infinite ease-in-out both;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingAnimation {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.2; }
    40% { transform: scale(1.2); opacity: 0.8; }
}

.nav-badge { position: relative; }

.total-unread {
    position: absolute;
    top: -4px;
    right: -4px;
    background: #ef4444;
    color: white;
    font-size: 0.6rem;
    padding: 1px 5px;
    border-radius: 6px;
    border: 1.5px solid var(--glass-bg);
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.preview-container {
    padding: 0 1rem;
    display: none;
    margin-bottom: 5px;
}

.image-preview-wrapper {
    position: relative;
    display: inline-block;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
}

.image-preview {
    max-height: 120px;
    max-width: 200px;
    display: block;
}

.remove-preview {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(0,0,0,0.6);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.remove-preview:hover {
    background: #ef4444;
}