:root {
    --bg-color: var(--tg-theme-bg-color, #ffffff);
    --text-color: var(--tg-theme-text-color, #000000);
    --hint-color: var(--tg-theme-hint-color, #999999);
    --link-color: var(--tg-theme-link-color, #2481cc);
    --primary-button-color: var(--tg-theme-button-color, #5288c1);
    --primary-button-text: var(--tg-theme-button-text-color, #ffffff);
    --secondary-bg-color: var(--tg-theme-secondary-bg-color, #f0f0f0);

    --user-msg-bg: #E3F2FD;
    --bot-msg-bg: #F5F5F5;
    --border-radius: 12px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --user-msg-bg: #1A3E5C;
        --bot-msg-bg: #2C2C2C;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* LANDING PAGE */
.landing-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: #333;
    padding: 20px;
    overflow-y: auto;
}

@media (prefers-color-scheme: dark) {
    .landing-container {
        background: linear-gradient(135deg, #1e1e1e 0%, #121212 100%);
        color: #eee;
    }
}

.landing-content {
    max-width: 800px;
    text-align: center;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin: auto;
}

@media (prefers-color-scheme: dark) {
    .landing-content {
        background: rgba(0, 0, 0, 0.4);
        border: 1px solid rgba(255, 255, 255, 0.05);
    }
}

.landing-content h1 {
    font-size: 36px;
    margin-bottom: 10px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.landing-content .subtitle {
    font-size: 18px;
    color: var(--hint-color);
    margin-bottom: 40px;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.feature-card {
    background: var(--secondary-bg-color);
    padding: 24px;
    border-radius: 12px;
    text-align: left;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-3px);
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 18px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.feature-card p {
    font-size: 14px;
    line-height: 1.6;
    color: var(--hint-color);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--primary-button-color, #2481cc);
    color: #fff;
    padding: 16px 36px;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(36, 129, 204, 0.4);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(36, 129, 204, 0.6);
    color: #fff;
}

.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    width: 100%;
}

/* HEADER */
.header {
    padding: 12px 16px;
    background-color: var(--secondary-bg-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 14px;
}

.header-stats {
    display: flex;
    flex-direction: column;
}

.header-stats span {
    margin-bottom: 4px;
}

.balance {
    font-weight: bold;
    color: #4CAF50;
}

.tokens {
    color: var(--hint-color);
    font-size: 12px;
}

.header-btn {
    background: none;
    border: none;
    color: var(--link-color);
    font-size: 14px;
    cursor: pointer;
    padding: 5px;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* MAIN LAYOUT */
.container {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* SIDEBAR (Чаты) */
.sidebar {
    width: 250px;
    background-color: var(--bg-color);
    border-right: 1px solid var(--secondary-bg-color);
    display: flex;
    flex-direction: column;
    position: absolute;
    left: -250px;
    top: 0;
    bottom: 0;
    z-index: 10;
    transition: left 0.3s ease;
}

.sidebar.open {
    left: 0;
}

.sidebar-header {
    padding: 15px;
    border-bottom: 1px solid var(--secondary-bg-color);
    display: flex;
    justify-content: space-between;
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
}

.chat-item {
    padding: 10px;
    border-radius: var(--border-radius);
    margin-bottom: 5px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    align-items: center;
    gap: 6px;
}

.chat-item i {
    color: var(--hint-color);
}

.chat-item:hover,
.chat-item.active {
    background-color: var(--secondary-bg-color);
}

/* CHAT AREA */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.message {
    max-width: 85%;
    padding: 10px 14px;
    border-radius: var(--border-radius);
    word-wrap: break-word;
    line-height: 1.4;
}

.msg-user {
    align-self: flex-end;
    background-color: var(--user-msg-bg);
    border-bottom-right-radius: 4px;
}

.msg-model {
    align-self: flex-start;
    background-color: var(--bot-msg-bg);
    border-bottom-left-radius: 4px;
}

.msg-media img,
.msg-media video {
    max-width: 100%;
    border-radius: 8px;
    margin-top: 5px;
    display: block;
}

.msg-media audio {
    width: 100%;
    margin-top: 5px;
}

/* INPUT AREA */
.input-area {
    padding: 10px 15px;
    background-color: var(--secondary-bg-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.attach-btn {
    font-size: 20px;
    color: var(--link-color);
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.chat-input {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    outline: none;
    font-size: 15px;
}

.send-btn {
    background-color: var(--primary-button-color);
    color: var(--primary-button-text);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

/* FILE PREVIEW */
.file-preview-container {
    padding: 10px 15px;
    background-color: var(--secondary-bg-color);
    display: flex;
    align-items: center;
    gap: 15px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
}

.file-preview-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-preview-content img {
    height: 60px;
    width: 60px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.file-preview-icon {
    font-size: 32px;
    color: var(--primary-button-color);
}

.file-info {
    display: flex;
    flex-direction: column;
    font-size: 13px;
    color: var(--text-color);
}

.file-size {
    font-size: 11px;
    color: var(--hint-color);
}

.file-remove-btn {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* MODALS */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    z-index: 100;
    justify-content: center;
    align-items: center;
}

.modal {
    background: var(--bg-color);
    width: 90%;
    max-width: 400px;
    border-radius: var(--border-radius);
    padding: 20px;
}

.modal h3 {
    margin-bottom: 15px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 13px;
    color: var(--hint-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--secondary-bg-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
}

.btn-cancel {
    background: transparent;
    color: var(--hint-color);
}

.btn-save {
    background: var(--primary-button-color);
    color: var(--primary-button-text);
}

.spinner {
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top: 3px solid var(--primary-button-color);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

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

    100% {
        transform: rotate(360deg);
    }
}