:root {
    --bg: #0a0e14;
    --bg-light: #1a1e24;
    --bg-input: #141820;
    --bg-card: #1e2228;
    --green: #39ff14;
    --green-dim: #2a8c0e;
    --amber: #ffb627;
    --blue: #5b9ef5;
    --cyan: #56d4dd;
    --red: #ff3333;
    --purple: #c084fc;
    --text: #c8d0d8;
    --text-dim: #6b7280;
    --text-bright: #e8eef4;
    --border: #2a2e34;
    --border-light: #3a3e44;
    --font: "SF Mono", "Fira Code", "JetBrains Mono", "Cascadia Code", monospace;
}

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

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

/* ── Header ── */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg-light);
    flex-shrink: 0;
}

.header-left { display: flex; align-items: center; gap: 1rem; }

.header-brand { display: flex; align-items: center; text-decoration: none; }
.brand-logo { height: 28px; width: auto; }
.header-titles { display: flex; align-items: baseline; gap: 0.75rem; }

h1 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--green);
    letter-spacing: 0.05em;
}

.subtitle { font-size: 0.7rem; color: var(--text-dim); }

#status-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}
.status-dot.connected { background: var(--green); box-shadow: 0 0 6px var(--green); }
.status-dot.disconnected { background: var(--red); }

.status-message { color: var(--text-dim); font-size: 0.7rem; margin-left: 0.5rem; }

/* ── Login Form ── */
.login-form {
    padding: 0.6rem 1.25rem;
    background: var(--bg-input);
    border-bottom: 1px solid var(--border);
}

.login-fields {
    display: flex;
    align-items: flex-end;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.login-field {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.login-field label {
    font-size: 0.65rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.login-field input {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.8rem;
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    outline: none;
    width: 150px;
}
.login-field input:focus { border-color: var(--green-dim); }
.login-field input[type="number"] { width: 70px; }

.login-hint {
    font-size: 0.65rem;
    color: var(--text-dim);
    margin-top: 0.4rem;
    font-style: italic;
}

/* ── Layout ── */
.layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ── Sidebar ── */
.sidebar {
    width: 320px;
    min-width: 320px;
    border-right: 1px solid var(--border);
    background: var(--bg-light);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.tab-btn {
    flex: 1;
    padding: 0.6rem 0.5rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-dim);
    font-family: var(--font);
    font-size: 0.72rem;
    cursor: pointer;
    transition: all 0.2s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--green); border-bottom-color: var(--green); }

.tab-panel { display: none; overflow-y: auto; padding: 0.75rem; flex: 1; }
.tab-panel.active { display: block; }

/* ── Categories ── */
.category { margin-bottom: 0.5rem; }

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0.5rem 0.6rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-bright);
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.2s;
}
.category-header:hover { border-color: var(--green-dim); }

.chevron { font-size: 0.65rem; color: var(--text-dim); transition: transform 0.2s; }

.category-desc {
    font-size: 0.68rem;
    color: var(--text-dim);
    padding: 0.3rem 0.6rem;
    line-height: 1.4;
}

.category-commands { padding: 0.25rem 0; }

/* ── Command Cards ── */
.cmd-card {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.6rem;
    margin-bottom: 0.4rem;
    transition: border-color 0.2s;
}
.cmd-card:hover { border-color: var(--border-light); }

.cmd-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.3rem;
}

.cmd-name { font-size: 0.78rem; color: var(--text-bright); font-weight: 500; }

.cmd-mode-badge {
    font-size: 0.6rem;
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-weight: 600;
}
.mode-cl { background: rgba(255,182,39,0.15); color: var(--amber); }
.mode-sql { background: rgba(91,158,245,0.15); color: var(--blue); }
.mode-qsh { background: rgba(57,255,20,0.1); color: var(--green); }

.cmd-desc { font-size: 0.68rem; color: var(--text-dim); margin-bottom: 0.3rem; line-height: 1.4; }

.cmd-code {
    display: block;
    font-size: 0.68rem;
    color: var(--cyan);
    background: var(--bg);
    padding: 0.3rem 0.5rem;
    border-radius: 3px;
    margin-bottom: 0.4rem;
    word-break: break-all;
}

.btn-run-small {
    background: var(--bg);
    border: 1px solid var(--green-dim);
    color: var(--green);
    font-family: var(--font);
    font-size: 0.68rem;
    padding: 0.25rem 0.6rem;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-run-small:hover { background: var(--green-dim); color: #fff; }

/* ── Lesson Cards ── */
.lesson-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
}
.lesson-card h3 { font-size: 0.82rem; color: var(--amber); margin-bottom: 0.3rem; }
.lesson-card p { font-size: 0.7rem; color: var(--text-dim); line-height: 1.4; margin-bottom: 0.5rem; }

.btn-lesson {
    background: rgba(255,182,39,0.1);
    border: 1px solid var(--amber);
    color: var(--amber);
    font-family: var(--font);
    font-size: 0.72rem;
    padding: 0.35rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-lesson:hover { background: var(--amber); color: var(--bg); }

/* ── Main content ── */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.manual-input {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.input-row { display: flex; gap: 0.5rem; }

select, input[type="text"] {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.82rem;
    padding: 0.5rem 0.7rem;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.2s;
}
select:focus, input[type="text"]:focus { border-color: var(--green-dim); }
select { width: 120px; }
input[type="text"] { flex: 1; }

.btn {
    background: var(--bg-light);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.8rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}
.btn:hover { border-color: var(--green-dim); color: var(--green); }

.btn-run { background: var(--green-dim); color: #fff; border-color: var(--green-dim); }
.btn-run:hover { background: var(--green); color: var(--bg); }

.btn-connect { border-color: var(--green-dim); color: var(--green); }
.btn-small { font-size: 0.72rem; padding: 0.3rem 0.6rem; }
.btn-muted { color: var(--text-dim); }

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.4rem;
}

.htmx-indicator {
    display: none;
    color: var(--amber);
    font-size: 0.72rem;
    animation: blink 1s infinite;
}
.htmx-request .htmx-indicator, .htmx-indicator.htmx-request { display: inline; }

@keyframes blink { 50% { opacity: 0.3; } }

/* ── Terminal Output ── */
.terminal-output {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

/* ── Welcome Message ── */
.welcome-message {
    max-width: 600px;
    margin: 2rem auto;
    text-align: center;
}
.welcome-message h2 {
    font-size: 1.2rem;
    color: var(--green);
    margin-bottom: 0.5rem;
}
.welcome-message p {
    color: var(--text-dim);
    font-size: 0.8rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.welcome-steps {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-bottom: 1.5rem;
}

.welcome-step {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.78rem;
}

.step-number {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--green-dim);
    color: #fff;
    border-radius: 50%;
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
}

.welcome-tip {
    color: var(--amber);
    font-size: 0.72rem;
    font-style: italic;
}

/* ── Output Blocks ── */
.output-block {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.output-block.learning { border-color: var(--border-light); }

.output-header {
    display: flex;
    gap: 0.75rem;
    padding: 0.4rem 0.75rem;
    background: var(--bg-input);
    border-bottom: 1px solid var(--border);
    font-size: 0.72rem;
}
.output-mode { color: var(--amber); font-weight: 600; }
.output-command { color: var(--green); }

.output-content {
    padding: 0.75rem;
    font-size: 0.78rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--text);
    max-height: 300px;
    overflow-y: auto;
}

.output-block.learning {
    max-height: none;
    overflow: visible;
}

/* ── Learning Output Extras ── */
.output-explanation {
    padding: 0.6rem 0.75rem;
    background: rgba(91,158,245,0.05);
    border-bottom: 1px solid var(--border);
}

.explanation-section { margin-bottom: 0.4rem; }
.explanation-section:last-child { margin-bottom: 0; }

.explanation-label {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--blue);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.explanation-section p {
    font-size: 0.75rem;
    color: var(--text);
    line-height: 1.5;
    margin-top: 0.15rem;
}

.output-command-run {
    padding: 0.4rem 0.75rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.run-label { color: var(--text-dim); }
.output-command-run code { color: var(--cyan); }

.output-tip {
    padding: 0.5rem 0.75rem;
    background: rgba(255,182,39,0.05);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.72rem;
    color: var(--amber);
    line-height: 1.4;
}
.tip-icon { font-size: 1rem; flex-shrink: 0; }

/* ── Lesson Active ── */
.lesson-active { padding: 0.5rem 0; }

.lesson-header {
    padding: 0.75rem 1rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 4px;
    margin-bottom: 1rem;
}
.lesson-header h2 { font-size: 1rem; color: var(--amber); margin-bottom: 0.3rem; }
.lesson-header p { font-size: 0.78rem; color: var(--text-dim); line-height: 1.4; }

.lesson-steps { display: flex; flex-direction: column; gap: 0.75rem; }

.lesson-step {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 4px;
}

.step-indicator { flex-shrink: 0; padding-top: 0.1rem; }

.step-content { flex: 1; }

.step-instruction {
    font-size: 0.8rem;
    color: var(--text-bright);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.step-command {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}
.step-command code {
    font-size: 0.72rem;
    color: var(--cyan);
    background: var(--bg);
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    flex: 1;
}

.step-output { margin-top: 0.25rem; }

.step-manual {
    font-size: 0.75rem;
    color: var(--purple);
    font-style: italic;
}

.step-concept {
    font-size: 0.72rem;
    color: var(--blue);
    font-style: italic;
    margin-top: 0.3rem;
}

.step-instruction {
    font-size: 0.8rem;
    color: var(--text-bright);
    margin-bottom: 0.5rem;
    line-height: 1.6;
    white-space: pre-wrap;
}

.lesson-summary {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem;
    margin-top: 1rem;
    background: rgba(57,255,20,0.05);
    border: 1px solid var(--green-dim);
    border-radius: 4px;
}
.summary-icon { font-size: 1.5rem; flex-shrink: 0; }
.lesson-summary strong { color: var(--green); font-size: 0.8rem; }
.lesson-summary p { font-size: 0.75rem; color: var(--text); line-height: 1.5; margin-top: 0.2rem; }

/* ── Cheat Sheet ── */
.cheatsheet h3 {
    font-size: 0.9rem;
    color: var(--green);
    margin-bottom: 0.75rem;
}

.cheat-section {
    margin-bottom: 1rem;
}
.cheat-section h4 {
    font-size: 0.78rem;
    color: var(--amber);
    margin-bottom: 0.4rem;
    padding-bottom: 0.2rem;
    border-bottom: 1px solid var(--border);
}

.cheat-list dt {
    font-size: 0.75rem;
    color: var(--cyan);
    font-weight: 600;
    margin-top: 0.4rem;
}
.cheat-list dd {
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-left: 0;
    margin-bottom: 0.3rem;
    line-height: 1.4;
}

.cheat-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.7rem;
}
.cheat-table td {
    padding: 0.25rem 0.4rem;
    border-bottom: 1px solid var(--border);
}
.cheat-table td:first-child {
    color: var(--cyan);
    white-space: nowrap;
    width: 40%;
}
.cheat-table td:last-child { color: var(--text-dim); }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }