:root {
    --bg-0: #0e1118;
    --bg-1: #131927;
    --panel: rgba(20, 26, 38, 0.86);
    --panel-border: rgba(93, 121, 162, 0.3);
    --text-main: #eaf2ff;
    --text-muted: #a7b5cf;
    --accent: #7ae582;
    --accent-2: #69b7ff;
    --danger: #ff6b6b;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text-main);
    background: radial-gradient(circle at 10% 5%, #1e2d4a, var(--bg-0) 55%), linear-gradient(140deg, var(--bg-0), var(--bg-1));
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.bg-grid {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 36px 36px;
    opacity: 0.45;
}

.chat-shell {
    position: relative;
    z-index: 1;
    max-width: 980px;
    margin: 22px auto;
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    background: var(--panel);
    backdrop-filter: blur(8px);
    box-shadow: 0 20px 44px rgba(0, 0, 0, 0.45);
    padding: 18px;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.chat-header h1 {
    margin: 0;
    font-size: 1.35rem;
}

.chat-header p {
    margin: 3px 0 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.header-actions {
    display: flex;
    gap: 8px;
}

button,
.ghost {
    border: 1px solid var(--panel-border);
    background: #1f2a3f;
    color: var(--text-main);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    text-decoration: none;
}

button:hover,
.ghost:hover {
    filter: brightness(1.08);
}

.chat-meta {
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.chat-meta label {
    color: var(--text-muted);
}

.chat-meta input {
    background: #0f1726;
    color: var(--text-main);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 7px 9px;
}

.meta-pill {
    background: #121c2f;
    border: 1px solid var(--panel-border);
    color: var(--text-muted);
    border-radius: 999px;
    padding: 5px 11px;
    font-size: 0.9rem;
}

.quick-commands {
    margin-top: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
}

.quick-commands button {
    font-size: 0.86rem;
    background: #17233a;
}

.command-picker {
    margin-top: 10px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 8px;
}

.command-picker label {
    color: var(--text-muted);
    font-size: 0.92rem;
}

.command-picker select {
    background: #0f1726;
    color: var(--text-main);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 8px 10px;
}

#insert-command {
    background: #1a314e;
}

.messages {
    margin-top: 14px;
    background: #0d1422;
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    min-height: 400px;
    max-height: 62vh;
    overflow-y: auto;
    padding: 14px;
}

.msg {
    margin: 8px 0;
    padding: 10px 12px;
    border-radius: 10px;
    width: fit-content;
    max-width: min(100%, 760px);
    white-space: pre-wrap;
    line-height: 1.35;
}

.msg.user {
    margin-left: auto;
    background: linear-gradient(130deg, #1f4c8a, #206f89);
}

.msg.assistant {
    margin-right: auto;
    background: #1b2538;
    border: 1px solid rgba(122, 229, 130, 0.4);
}

.msg.system {
    margin-right: auto;
    background: #2b1f24;
    border: 1px solid rgba(255, 107, 107, 0.45);
    color: #ffd7d7;
}

.meta {
    margin-bottom: 3px;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.composer {
    margin-top: 12px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
}

.composer textarea {
    resize: vertical;
    min-height: 56px;
    max-height: 180px;
    background: #0f1726;
    color: var(--text-main);
    border: 1px solid var(--panel-border);
    border-radius: 10px;
    padding: 10px;
}

#send-btn {
    min-width: 100px;
    background: linear-gradient(120deg, #4d9ef7, #56d07c);
    color: #03151b;
    font-weight: 600;
}

@media (max-width: 760px) {
    .chat-shell {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
        border-left: 0;
        border-right: 0;
    }

    .composer {
        grid-template-columns: 1fr;
    }

    .command-picker {
        grid-template-columns: 1fr;
    }

    #send-btn {
        width: 100%;
    }
}