:root {
    --tg-theme-bg-color: #17212b;
    --tg-theme-secondary-bg-color: #0e1621;
    --tg-theme-text-color: #f5f5f5;
    --tg-theme-hint-color: #8b9bab;
    --tg-theme-link-color: #7ab8ff;
    --tg-theme-button-color: #3390ec;
    --tg-theme-button-text-color: #ffffff;
    --tg-theme-section-bg-color: #17212b;
    --tg-theme-header-bg-color: #1f2c3a;

    --app-bg: var(--tg-theme-bg-color);
    --surface: color-mix(in srgb, var(--tg-theme-secondary-bg-color) 88%, black);
    --surface-raised: color-mix(in srgb, var(--tg-theme-header-bg-color) 82%, black);
    --surface-soft: color-mix(in srgb, var(--tg-theme-bg-color) 85%, white 5%);
    --line: color-mix(in srgb, var(--tg-theme-hint-color) 20%, transparent);
    --text: var(--tg-theme-text-color);
    --muted: color-mix(in srgb, var(--tg-theme-hint-color) 90%, white 10%);
    --accent: var(--tg-theme-button-color);
    --accent-text: var(--tg-theme-button-text-color);
    --user-bubble: color-mix(in srgb, var(--tg-theme-hint-color) 26%, var(--tg-theme-secondary-bg-color));
    --agent-bubble: color-mix(in srgb, var(--tg-theme-button-color) 82%, black 18%);
    --shadow: 0 20px 48px rgba(0, 0, 0, 0.28);
    --viewport-height: 100vh;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    background:
        radial-gradient(circle at top left, color-mix(in srgb, var(--accent) 20%, transparent), transparent 30%),
        radial-gradient(circle at top right, color-mix(in srgb, var(--tg-theme-link-color) 16%, transparent), transparent 26%),
        var(--app-bg);
    color: var(--text);
    font-family: "Segoe UI", "Helvetica Neue", sans-serif;
}

body {
    min-height: var(--viewport-height);
}

.app-shell {
    min-height: var(--viewport-height);
    display: grid;
    grid-template-rows: auto 1fr auto;
    padding:
        calc(env(safe-area-inset-top, 0px) + 10px)
        12px
        calc(env(safe-area-inset-bottom, 0px) + 10px);
    gap: 10px;
}

.topbar,
.composer {
    background: var(--surface-raised);
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
}

.title-block {
    min-width: 0;
}

.header-kicker {
    margin: 0 0 4px;
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.topbar h1 {
    margin: 0;
    font-size: 18px;
    line-height: 1.2;
    word-break: break-word;
}

.topbar-side {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-chip,
.close-ticket-button,
.icon-button,
.text-button,
.send-button {
    border: 0;
    font: inherit;
}

.status-chip {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--surface) 82%, var(--accent) 18%);
    color: var(--text);
    font-size: 13px;
    white-space: nowrap;
}

.close-ticket-button,
.text-button {
    padding: 8px 12px;
    border-radius: 999px;
    color: var(--text);
    background: color-mix(in srgb, var(--surface-soft) 82%, white 4%);
    cursor: pointer;
}

.messages {
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 8px 0;
    scroll-behavior: smooth;
}

.message-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-width: 100%;
}

.message-row.user {
    align-items: flex-start;
}

.message-row.agent {
    align-items: flex-end;
}

.message-bubble {
    max-width: min(82%, 34rem);
    padding: 12px 14px;
    border-radius: 18px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow-wrap: anywhere;
}

.message-row.user .message-bubble {
    background: var(--user-bubble);
    border-top-left-radius: 8px;
}

.message-row.agent .message-bubble {
    background: var(--agent-bubble);
    color: var(--accent-text);
    border-top-right-radius: 8px;
}

.message-text {
    margin: 0;
    white-space: pre-wrap;
    line-height: 1.45;
}

.message-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 4px;
    color: var(--muted);
    font-size: 12px;
}

.attachment {
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.attachment img,
.attachment video {
    display: block;
    max-width: min(100%, 340px);
    border-radius: 16px;
}

.attachment audio {
    width: min(100%, 280px);
}

.attachment-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    padding: 10px 12px;
    border-radius: 14px;
    background: color-mix(in srgb, var(--surface-soft) 86%, white 4%);
    color: var(--text);
    text-decoration: none;
}

.reactions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 0 4px;
}

.reaction-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--surface-soft) 84%, white 6%);
    color: var(--text);
    font-size: 12px;
}

.composer {
    padding: 10px;
    display: grid;
    gap: 10px;
}

.composer-row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: end;
    gap: 8px;
}

.icon-button,
.send-button {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    cursor: pointer;
}

.icon-button {
    background: color-mix(in srgb, var(--surface-soft) 84%, white 6%);
    color: var(--text);
}

.send-button {
    background: var(--accent);
    color: var(--accent-text);
}

.send-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.input-shell {
    display: block;
    padding: 12px 14px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: var(--surface);
}

.input-shell textarea {
    width: 100%;
    min-height: 22px;
    max-height: 160px;
    resize: none;
    border: 0;
    outline: none;
    background: transparent;
    color: var(--text);
    font: inherit;
}

.composer-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.attachment-name {
    color: var(--muted);
    font-size: 12px;
    text-align: right;
}

.file-preview {
    padding: 10px 12px;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text);
}

.file-preview.hidden {
    display: none;
}

.file-preview img {
    display: block;
    max-width: min(100%, 180px);
    border-radius: 14px;
    margin-bottom: 8px;
}

.emoji-picker {
    position: fixed;
    z-index: 30;
    display: flex;
    gap: 6px;
    padding: 10px;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: var(--surface-raised);
    box-shadow: var(--shadow);
}

.emoji-picker.hidden {
    display: none;
}

.emoji-picker button {
    width: 40px;
    height: 40px;
    border: 0;
    border-radius: 12px;
    background: color-mix(in srgb, var(--surface-soft) 86%, white 4%);
    color: var(--text);
    font-size: 20px;
    cursor: pointer;
}

.empty-state {
    margin: auto;
    padding: 22px 18px;
    text-align: center;
    border-radius: 20px;
    background: color-mix(in srgb, var(--surface) 92%, white 2%);
    color: var(--muted);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (min-width: 860px) {
    body {
        display: flex;
        justify-content: center;
    }

    .app-shell {
        width: min(100%, 920px);
    }
}

@media (max-width: 640px) {
    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .topbar-side {
        width: 100%;
        justify-content: space-between;
    }

    .message-bubble {
        max-width: 90%;
    }
}