:root {
    --bg: #0a0a0a;
    --panel: #0d0d0d;
    --panel-soft: rgba(255, 255, 255, 0.05);
    --line: #262626;
    --text: #f5f5f5;
    --muted: #666666;
    --user-bg: #f5f5f5;
    --user-text: #0a0a0a;
    --shadow: 0 20px 80px rgba(0, 0, 0, 0.35);
    --glass: rgba(255, 255, 255, 0.03);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: "Inter", sans-serif;
}

body {
    height: 100dvh;
    overflow: hidden;
}

button,
textarea {
    font: inherit;
}

.app-shell {
    height: 100dvh;
    width: 100%;
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.04), transparent 30%),
        radial-gradient(circle at bottom right, rgba(255, 255, 255, 0.03), transparent 35%),
        var(--bg);
}

.main-panel {
    position: relative;
    height: 100dvh;
    width: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.topbar {
    position: relative;
    z-index: 2;
    height: 96px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    border-bottom: 1px solid var(--line);
    background: rgba(10, 10, 10, 0.88);
    backdrop-filter: blur(12px);
}

.topbar-left {
    display: flex;
    align-items: center;
    min-width: 0;
}

.topbar-copy {
    min-width: 0;
}

.topbar-title-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.topbar-title {
    margin: 0;
    font-size: clamp(1.25rem, 2.8vw, 2.2rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    text-transform: uppercase;
}

.model-pill {
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    padding: 0.35rem 0.75rem;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    font-family: "JetBrains Mono", monospace;
    color: #cfcfcf;
}

.topbar-status {
    margin: 0.35rem 0 0;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    font-family: "JetBrains Mono", monospace;
    color: var(--muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-status span {
    color: #22c55e;
}

.chat-stage {
    position: relative;
    z-index: 1;
    flex: 1;
    overflow-y: auto;
    padding-bottom: 0;
}

.chat-inner {
    max-width: 960px;
    min-height: 100%;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.message-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: auto;
}

.message {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.user-message {
    align-items: flex-end;
}

.assistant-message {
    align-items: flex-start;
}

.message-meta {
    margin-bottom: 0.5rem;
    font-size: 10px;
    color: var(--muted);
    font-family: "JetBrains Mono", monospace;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.message-bubble {
    max-width: min(100%, 760px);
    box-shadow: var(--shadow);
    word-break: break-word;
}

.message-bubble-user {
    background: var(--user-bg);
    color: var(--user-text);
    border-radius: 999px;
    padding: 0.9rem 1.5rem;
    font-size: 14px;
    font-weight: 700;
}

.message-bubble-assistant {
    background: var(--panel-soft);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    padding: 1.5rem;
    width: 100%;
}

.message-markdown,
.message-plain {
    font-size: 14px;
    line-height: 1.65;
    color: #d4d4d8;
}

.message-bubble-user .message-plain {
    color: var(--user-text);
}

.message-markdown p,
.message-plain p {
    margin: 0 0 1rem;
}

.message-markdown p:last-child,
.message-plain p:last-child {
    margin-bottom: 0;
}

.message-markdown pre {
    margin: 1rem 0;
    padding: 1rem;
    overflow-x: auto;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: rgba(0, 0, 0, 0.45);
    color: #a1a1aa;
    font-family: "JetBrains Mono", monospace;
    font-size: 12px;
}

.message-markdown code:not(pre code) {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    padding: 0.1rem 0.35rem;
    font-family: "JetBrains Mono", monospace;
    font-size: 0.9em;
    color: #f4f4f5;
}

.message-markdown ul,
.message-markdown ol {
    margin: 0.5rem 0 1rem 1.5rem;
}

.message-markdown li + li {
    margin-top: 0.35rem;
}

.message-markdown a {
    color: #60a5fa;
}

.message-markdown strong {
    color: #fafafa;
    font-weight: 700;
}

.message-markdown em {
    font-style: italic;
}

.message-markdown h1,
.message-markdown h2,
.message-markdown h3 {
    margin: 1.25rem 0 0.75rem;
    color: #fafafa;
    font-weight: 800;
    line-height: 1.2;
}

.message-markdown h1 {
    font-size: 1.35rem;
}

.message-markdown h2 {
    font-size: 1.15rem;
    padding-bottom: 0.35rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.message-markdown h3 {
    font-size: 1rem;
}

.message-markdown blockquote {
    margin: 1rem 0;
    padding-left: 1rem;
    border-left: 2px solid rgba(255, 255, 255, 0.18);
    color: #a1a1aa;
    font-style: italic;
}

.typing-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-left: 0.2rem;
    opacity: 0.65;
}

.typing-label {
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-family: "JetBrains Mono", monospace;
}

.typing-dots {
    display: flex;
    gap: 0.25rem;
}

.typing-dots span {
    width: 4px;
    height: 4px;
    border-radius: 999px;
    background: var(--text);
    animation: pulse 1.4s infinite ease-in-out;
    opacity: 0.25;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes pulse {
    0%, 80%, 100% {
        opacity: 0.2;
    }
    40% {
        opacity: 1;
    }
}

.chat-anchor {
    width: 100%;
    height: 1px;
}

.composer-spacer {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    pointer-events: none;
}

.composer-wrap {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
    padding: 0 2rem 2rem;
    background: linear-gradient(to top, var(--bg), var(--bg), rgba(10, 10, 10, 0));
}

.composer {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: var(--glass);
}

#message-input {
    flex: 1;
    min-height: 52px;
    max-height: 160px;
    resize: none;
    border: 0;
    outline: none;
    background: transparent;
    color: var(--text);
    padding: 0.95rem 1rem;
    font-size: 14px;
    line-height: 1.45;
    font-family: "JetBrains Mono", monospace;
}

#message-input::placeholder {
    color: #555;
}

#send-button {
    width: 112px;
    height: 48px;
    border: 0;
    border-radius: 14px;
    background: #fff;
    color: #000;
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.2s ease;
    flex-shrink: 0;
}

#send-button:hover {
    background: #ddd;
}

#send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.background-word {
    position: absolute;
    inset: 50% auto auto 50%;
    transform: translate(-50%, -50%);
    font-size: min(15vw, 200px);
    font-weight: 900;
    letter-spacing: -0.08em;
    opacity: 0.02;
    pointer-events: none;
    user-select: none;
    z-index: 0;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-thumb {
    background: var(--line);
    border-radius: 999px;
}

@media (max-width: 900px) {
    .topbar,
    .chat-inner,
    .composer-wrap {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .composer-wrap {
        padding-bottom: 1rem;
    }

}

@media (max-width: 640px) {
    .topbar {
        height: auto;
        padding-top: 1rem;
        padding-bottom: 1rem;
    }

    .topbar-status {
        white-space: normal;
    }

    .message-bubble-user {
        border-radius: 24px;
        max-width: 100%;
    }

    .message-bubble-assistant {
        padding: 1rem;
    }

    .composer {
        align-items: stretch;
        flex-direction: column;
    }

    #send-button {
        width: 100%;
    }

}