/* LaTeX Doctor — syntax troubleshooter
   Self-contained styling; matches the rami.party workshop's magic-lab mood
   without depending on the parent site's stylesheets. */

:root {
    --bg: #0b0524;
    --bg-panel: #150a3a;
    --bg-panel-alt: #1b0f47;
    --border: #34206f;
    --text: #ece7ff;
    --muted: #a99fd6;
    --violet: #8a5cff;
    --cyan: #4fd8ff;
    --gold: #ffcf6b;
    --red: #ff5c7a;
    --green: #4ee8a4;
    --mono: 'Fira Mono', 'Consolas', 'Menlo', 'Monaco', monospace;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at 20% -10%, #1c1050 0%, var(--bg) 55%);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

.app {
    max-width: 1180px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.app-header {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.8rem;
    color: var(--cyan);
    margin: 0 0 0.4rem;
}

.app-header h1 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    margin: 0 0 0.6rem;
    background: linear-gradient(90deg, var(--violet), var(--cyan));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.sub {
    max-width: 60ch;
    color: var(--muted);
    line-height: 1.5;
}

.sub code {
    color: var(--gold);
}

.back-link {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.9rem;
    white-space: nowrap;
}

.back-link:hover {
    color: var(--cyan);
}

.layout {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 860px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

.editor-pane,
.results-pane {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.1rem;
    display: flex;
    flex-direction: column;
    min-height: 420px;
}

.pane-head {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
}

.pane-head h2 {
    margin: 0;
    font-size: 1.05rem;
    color: var(--text);
}

.pane-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn {
    font: inherit;
    font-size: 0.85rem;
    padding: 0.45rem 0.9rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    cursor: pointer;
    background: transparent;
    color: var(--text);
    transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.btn-ghost:hover {
    border-color: var(--cyan);
    color: var(--cyan);
}

.btn-primary {
    background: linear-gradient(90deg, var(--violet), #6a3fe0);
    border-color: transparent;
    color: #fff;
    font-weight: 600;
}

.btn-primary:hover {
    filter: brightness(1.1);
}

.btn:focus-visible,
.back-link:focus-visible,
.app-footer a:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 2px;
}

.btn[disabled] {
    opacity: 0.45;
    cursor: not-allowed;
}

.btn[disabled]:hover {
    border-color: var(--border);
    color: var(--text);
}

.tex-input {
    flex: 1;
    min-height: 320px;
    resize: vertical;
    background: #0a0522;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.9rem;
    font-family: var(--mono);
    font-size: 0.92rem;
    line-height: 1.5;
    tab-size: 4;
}

.tex-input:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 0 2px rgba(79, 216, 255, 0.25);
}

.tex-input::placeholder {
    color: #6f66a3;
}

.hint {
    margin: 0.6rem 0 0;
    font-size: 0.78rem;
    color: var(--muted);
}

.hint kbd {
    font-family: var(--mono);
    font-size: 0.75em;
    background: var(--bg-panel-alt);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.05rem 0.35rem;
}

.status-chip {
    font-size: 0.75rem;
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    white-space: nowrap;
}

.status-idle {
    color: var(--muted);
}

.status-ok {
    color: var(--green);
    border-color: var(--green);
}

.status-warn {
    color: var(--gold);
    border-color: var(--gold);
}

.status-error {
    color: var(--red);
    border-color: var(--red);
}

.results {
    flex: 1;
    overflow: auto;
}

.placeholder {
    color: var(--muted);
    font-size: 0.9rem;
}

.issue-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.issue {
    border: 1px solid var(--border);
    border-left-width: 4px;
    border-radius: 8px;
    background: var(--bg-panel-alt);
}

.issue-error {
    border-left-color: var(--red);
}

.issue-warning {
    border-left-color: var(--gold);
}

.issue-jump {
    display: block;
    width: 100%;
    text-align: left;
    font: inherit;
    color: inherit;
    background: transparent;
    border: 0;
    border-radius: 8px;
    padding: 0.6rem 0.8rem;
    cursor: pointer;
}

.issue-jump:hover {
    background: rgba(79, 216, 255, 0.07);
}

.issue-jump:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 2px;
}

.issue-line {
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--cyan);
    display: block;
    margin-bottom: 0.2rem;
}

.issue-message {
    display: block;
    font-size: 0.9rem;
    line-height: 1.4;
}

.issue-snippet {
    display: block;
    margin-top: 0.45rem;
    padding: 0.35rem 0.5rem;
    border-radius: 6px;
    background: #0a0522;
    border: 1px solid var(--border);
    color: var(--muted);
    font-family: var(--mono);
    font-size: 0.78rem;
    white-space: pre-wrap;
    word-break: break-word;
}

.issue-message code {
    color: var(--gold);
}

.success-banner {
    display: flex;
    gap: 0.6rem;
    align-items: flex-start;
    color: var(--green);
    font-size: 0.95rem;
    line-height: 1.5;
}

.checks-list {
    margin-top: 2.2rem;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.2rem 1.4rem;
}

.checks-list h2 {
    font-size: 1rem;
    margin-top: 0;
}

.checks-list ul {
    margin: 0;
    padding-left: 1.2rem;
    color: var(--muted);
    line-height: 1.7;
}

.checks-list code {
    color: var(--gold);
}

.checks-note {
    margin: 1rem 0 0;
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.6;
}

.app-footer {
    text-align: center;
    color: var(--muted);
    font-size: 0.8rem;
    margin-top: 2rem;
}

.app-footer a {
    color: var(--cyan);
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}