/* Claude AI Mini App — Telegram Theme */
:root {
    --bg: var(--tg-theme-bg-color, #1a1a2e);
    --bg-secondary: var(--tg-theme-secondary-bg-color, #16213e);
    --text: var(--tg-theme-text-color, #e8e8e8);
    --text-hint: var(--tg-theme-hint-color, #8a8a9a);
    --accent: var(--tg-theme-button-color, #7c3aed);
    --accent-text: var(--tg-theme-button-text-color, #ffffff);
    --link: var(--tg-theme-link-color, #a78bfa);
    --border: rgba(255,255,255,0.08);
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
    --sonnet: #3b82f6;
    --opus: #8b5cf6;
    --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
    -webkit-text-size-adjust: none;
}

/* ─── Screens ──────────────────────────────────── */
.screen {
    display: none;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}
.screen.active { display: flex; }

/* ─── Header ───────────────────────────────────── */
.header {
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.header h1 {
    font-size: 18px;
    font-weight: 600;
    flex: 1;
}

.btn-back {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
}
.btn-icon {
    background: none;
    border: none;
    color: var(--text);
    font-size: 22px;
    cursor: pointer;
    padding: 4px 8px;
}

/* ─── Balance Bar ──────────────────────────────── */
.balance-bar {
    display: flex;
    gap: 8px;
    align-items: center;
    font-size: 13px;
    background: rgba(124,58,237,0.15);
    padding: 4px 10px;
    border-radius: 20px;
}
.balance-bar span:first-child {
    font-weight: 600;
    color: var(--accent);
}
.balance-detail {
    color: var(--text-hint);
    font-size: 11px;
}

/* ─── Chats List ───────────────────────────────── */
.chats-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.chat-item {
    display: flex;
    align-items: center;
    padding: 14px 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    margin-bottom: 6px;
    cursor: pointer;
    transition: background 0.15s;
    gap: 12px;
}
.chat-item:active { background: rgba(124,58,237,0.15); }

.chat-item-icon {
    font-size: 24px;
    flex-shrink: 0;
}
.chat-item-body { flex: 1; min-width: 0; }
.chat-item-title {
    font-weight: 500;
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.chat-item-meta {
    font-size: 12px;
    color: var(--text-hint);
    margin-top: 2px;
}
.chats-toolbar {
    display: flex;
    padding: 8px 16px 0;
    gap: 8px;
    flex-shrink: 0;
}
.btn-filter {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-hint);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
}
.btn-filter.active {
    background: var(--accent);
    color: var(--accent-text);
    border-color: var(--accent);
}

.btn-star {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 4px 6px;
    flex-shrink: 0;
    filter: brightness(1.3);
    transition: transform 0.15s;
}
.btn-star:active { transform: scale(1.2); }

.btn-delete-chat {
    background: none;
    border: none;
    color: var(--text-hint);
    font-size: 16px;
    cursor: pointer;
    padding: 4px 6px;
    flex-shrink: 0;
    opacity: 0.4;
    transition: opacity 0.15s;
}
.btn-delete-chat:active { opacity: 1; color: var(--danger); }

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-hint);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-hint);
}
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: 15px; line-height: 1.5; }

/* ─── Buttons ──────────────────────────────────── */
.btn-primary {
    display: block;
    width: calc(100% - 32px);
    margin: 12px 16px;
    padding: 14px;
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    flex-shrink: 0;
}
.btn-primary:active { opacity: 0.85; }

/* ─── New Chat Form ────────────────────────────── */
.form-group {
    padding: 16px;
}
.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-hint);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.form-group input[type="text"] {
    width: 100%;
    padding: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 16px;
    outline: none;
}
.form-group input:focus {
    border-color: var(--accent);
}

.model-cards {
    display: flex;
    gap: 10px;
}
.model-card {
    flex: 1;
    padding: 16px 12px;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s;
}
.model-card.selected {
    border-color: var(--accent);
    background: rgba(124,58,237,0.1);
}
.model-icon { font-size: 28px; margin-bottom: 6px; }
.model-name { font-weight: 600; font-size: 15px; }
.model-desc { font-size: 12px; color: var(--text-hint); margin-top: 4px; }

/* ─── Chat Header ──────────────────────────────── */
.chat-header { gap: 6px; }
.chat-title-bar { flex: 1; min-width: 0; }
.chat-title-bar h1 {
    font-size: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.model-badge {
    display: inline-block;
    font-size: 11px;
    padding: 1px 8px;
    border-radius: 10px;
    background: rgba(59,130,246,0.2);
    color: var(--sonnet);
}
.model-badge.opus {
    background: rgba(139,92,246,0.2);
    color: var(--opus);
}

/* ─── Context Bar ──────────────────────────────── */
.context-bar {
    padding: 6px 16px 8px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.context-progress {
    height: 3px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 4px;
}
.context-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.3s, background 0.3s;
}
.context-fill.warning { background: var(--warning); }
.context-fill.danger { background: var(--danger); }

.context-info {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-hint);
}

/* ─── Messages ─────────────────────────────────── */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 12px 12px 4px;
    scroll-behavior: smooth;
}

.message {
    margin-bottom: 10px;
    max-width: 88%;
}
.message.user {
    margin-left: auto;
}
.message.assistant {
    margin-right: auto;
}

.message-bubble {
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 15px;
    line-height: 1.45;
    word-wrap: break-word;
}
.message.user .message-bubble {
    background: var(--accent);
    color: var(--accent-text);
    border-bottom-right-radius: 4px;
}
.message.assistant .message-bubble {
    background: var(--bg-secondary);
    border-bottom-left-radius: 4px;
}
.message.system .message-bubble {
    background: rgba(245,158,11,0.1);
    border: 1px solid rgba(245,158,11,0.2);
    font-size: 13px;
    color: var(--text-hint);
    text-align: center;
    max-width: 100%;
    border-radius: 8px;
}

.message-cost {
    font-size: 11px;
    color: var(--text-hint);
    margin-top: 3px;
    padding: 0 4px;
}
.message.user .message-cost { text-align: right; }

.message-file {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    background: rgba(255,255,255,0.08);
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    margin-bottom: 4px;
}
.message-file:hover { background: rgba(255,255,255,0.12); }

/* Markdown в ответах */
.message-bubble h1, .message-bubble h2, .message-bubble h3 {
    font-size: 15px;
    font-weight: 600;
    margin: 8px 0 4px;
}
.message-bubble p { margin: 4px 0; }
.message-bubble ul, .message-bubble ol {
    padding-left: 20px;
    margin: 4px 0;
}
.message-bubble code {
    background: rgba(0,0,0,0.3);
    padding: 1px 5px;
    border-radius: 4px;
    font-size: 13px;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
}
.message-bubble pre {
    background: rgba(0,0,0,0.4);
    padding: 10px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 6px 0;
}
.message-bubble pre code {
    background: none;
    padding: 0;
}
.message-bubble blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 10px;
    margin: 6px 0;
    color: var(--text-hint);
}
.message-bubble a {
    color: var(--link);
    text-decoration: none;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
}
.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-hint);
    border-radius: 50%;
    animation: typing 1.2s infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing {
    0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
    30% { opacity: 1; transform: scale(1); }
}

/* ─── Input Bar ────────────────────────────────── */
.input-bar {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}
.btn-attach {
    font-size: 22px;
    padding: 6px;
    cursor: pointer;
    flex-shrink: 0;
}
#msg-input {
    flex: 1;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text);
    font-size: 15px;
    resize: none;
    max-height: 120px;
    outline: none;
    font-family: inherit;
    line-height: 1.4;
}
#msg-input:focus { border-color: var(--accent); }
#msg-input::placeholder { color: var(--text-hint); }

.btn-send {
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.btn-send:disabled { opacity: 0.4; }

/* ─── Bottom Actions ───────────────────────────── */
.chat-bottom-actions {
    padding: 0 12px 8px;
    background: var(--bg-secondary);
    flex-shrink: 0;
}
.btn-to-tg {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: var(--radius);
    font-size: 14px;
    cursor: pointer;
}
.btn-to-tg:active { background: rgba(124,58,237,0.1); }

/* ─── Overlay Menu ─────────────────────────────── */
.overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 100;
    align-items: flex-end;
    justify-content: center;
}
.overlay.active { display: flex; }

.menu-sheet {
    width: 100%;
    max-width: 400px;
    background: var(--bg-secondary);
    border-radius: 16px 16px 0 0;
    padding: 8px;
    animation: slideUp 0.2s ease;
}
@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}
.menu-sheet button {
    display: block;
    width: 100%;
    padding: 14px 16px;
    background: none;
    border: none;
    color: var(--text);
    font-size: 16px;
    text-align: left;
    cursor: pointer;
    border-radius: 10px;
}
.menu-sheet button:active { background: rgba(255,255,255,0.05); }
.menu-sheet button.danger { color: var(--danger); }