/* =============== СНЕГ CSS =============== */
#snow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    background-image: 
        radial-gradient(2px 2px at 50px 50px, #e6d9ff, rgba(230,217,255,0)),
        radial-gradient(3px 3px at 150px 100px, #e6d9ff, rgba(230,217,255,0)),
        radial-gradient(2px 2px at 250px 150px, #e6d9ff, rgba(230,217,255,0));
    background-size: 300px 300px;
    animation: snow 8s linear infinite;
}

@keyframes snow {
    0% { background-position: 0 0, 0 0, 0 0; }
    100% { background-position: 0 1000px, 0 800px, 0 1200px; }
}

/* Адаптивный базовый шрифт */
html {
    font-size: clamp(14px, 1.5vw + 0.5rem, 18px);
}

/* =============== ОСНОВНОЕ =============== */
body {
    margin: 0;
    font-family: "Inter", sans-serif;
    background: #f0f3f7;
    font-size: clamp(15px, 2vw, 17px);
}

/* HEADER */
.header {
    background: linear-gradient(90deg, #292929, rgb(17, 17, 17));
    color: white;
    padding: 15px 5%;
    position: sticky;
    top: 8px;
    z-index: 5;
    box-shadow: 0 3px 6px rgba(0,0,0,0.2);
    border-radius: 20px;
    margin: 0 auto;
    margin-bottom: 32px;
    width: 85%;
    max-width: 900px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: clamp(15px, 2.5vw, 18px);
}

.logo {
    height: 40px;
    min-width: 120px;
    display: flex;
    gap: 8px;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
    font-size: clamp(14px, 2vw, 16px);
}

.logo-img {
    width: 80px;
    height: auto;
    flex-shrink: 0;
    min-width: 80px;
}

/* =============== ЧАТ =============== */
.chat-wrapper {
    display: flex;
    justify-content: center;
    padding: 15px;
    z-index: 3;
    font-size: clamp(15px, 2vw, 17px);
}

.chat-scroll {
    width: 100%;
    max-width: 900px;
    height: calc(100vh - 200px);
    overflow-y: auto;
    padding-right: 5px;
}

.chat {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.msg {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

/* АВАТАРКИ - ФИКСИРОВАННЫЕ РАЗМЕРЫ */
.avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    font-size: 26px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
    min-width: 44px;
    line-height: 1;
}

.bot-avatar {
    background: white;
    border: 2px solid #AB00EA;
    flex-shrink: 0;
}

/* пузырь сообщения */
.bubble {
    background: white;
    padding: 15px;
    border-radius: 14px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.12);
    font-size: clamp(14px, 2vw, 16px);
    line-height: 1.4;
    max-width: 75%;
    position: relative;
}

/* снежный обвод */
.bubble::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 14px;
    pointer-events: none;
    box-shadow: inset 0 0 12px rgba(255,255,255,0.8);
}

/* яркая фиолетовая ссылка для скачивания */
.download-link {
    color: rgb(171, 0, 234);
    text-decoration: none;
    font-weight: 500;
    font-size: clamp(14px, 2vw, 16px);
}

.download-link:hover {
    color: #AB00EA;
    text-decoration: underline;
}

/* анимация появления */
.fade-in {
    animation: fadeIn 0.6s ease forwards;
    opacity: 0;
}

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

/* =============== TYPING =============== */
.typing-bubble {
    display: flex;
    gap: 5px;
}

.typing .dot {
    width: 8px;
    height: 8px;
    background: #AB00EA;
    border-radius: 50%;
    animation: blink 1.4s infinite ease-in-out;
}

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

@keyframes blink {
    0% { opacity: .2; }
    20% { opacity: 1; }
    100% { opacity: .2; }
}

/* =============== ФОРМА =============== */
.upload-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.file-input {
    padding: 8px;
    border-radius: 8px;
    border: 1px solid #bbb;
    font-size: clamp(14px, 2vw, 16px);
}

.send-btn {
    background: linear-gradient(90deg, #AB00EA, rgb(171, 0, 234));
    border: none;
    color: white;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: clamp(14px, 2vw, 16px);
}

.send-btn:hover {
    background: rgb(171, 0, 234);
}

/* таблица */
.table-wrapper {
    overflow-x: auto;
}

.preview-table {
    border-collapse: collapse;
    width: 100%;
    min-width: 600px;
}

.preview-table th {
    background: linear-gradient(90deg, #AB00EA, rgb(171, 0, 234));
    color: white;
    padding: 8px;
    font-size: clamp(14px, 2vw, 16px);
}

.preview-table td {
    background: #fafafa;
    padding: 8px;
    font-size: clamp(14px, 2vw, 16px);
}

/* FOOTER */
.footer {
    text-align: center;
    padding: 20px;
    background: #fafafa;
    color: #333;
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: clamp(13px, 1.8vw, 15px);
}

.footer-logo {
    width: 16px;
    height: auto;
}

.footer-content {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: -16px;
}

/* адаптив */
@media (max-width: 768px) {
    .header {
        max-width: 100%;
        padding: 15px 20px;
        border-radius: 16px;
    }
    
    .logo {
        height: 36px;
        min-width: 110px;
        gap: 6px;
    }
    
    .logo-img {
        width: 72px;
        min-width: 72px;
    }
    
    /* АВАТАРКИ - ФИКСИРОВАННЫЕ */
    .avatar {
        width: 40px;
        height: 40px;
        font-size: 24px;
        min-width: 40px;
    }
    
    .bubble { 
        max-width: 90%; 
        padding: 12px;
    }
    .preview-table { min-width: 400px; }
    .send-btn { 
        font-size: clamp(13px, 2.5vw, 15px);
        padding: 8px 14px;
    }
}

@media (max-width: 480px) {
    .logo {
        height: 32px;
        min-width: 100px;
        gap: 4px;
    }
    
    .logo-img {
        width: 64px;
        min-width: 64px;
    }
    
    /* АВАТАРКИ - ФИКСИРОВАННЫЕ */
    .avatar {
        width: 36px;
        height: 36px;
        font-size: 22px;
        min-width: 36px;
    }
    
    .bubble { 
        padding: 10px;
        font-size: clamp(13px, 3vw, 14px);
    }
    .send-btn { 
        font-size: clamp(12px, 3vw, 14px);
        padding: 7px 12px;
    }
}