/* === design tokens === */
:root {
    --bg: #f4f6fb;
    --surface: #ffffff;
    --surface-2: #eef1f7;
    --border: #d8dee9;
    --border-strong: #c2cad8;
    --text: #1a2230;
    --text-dim: #65718a;
    --accent: #2f81f7;
    --accent-hover: #1f6fe5;
    --accent-soft: rgba(47, 129, 247, 0.12);
    --danger: #e5534b;
    --radius: 10px;
    --radius-sm: 7px;
    --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 16px rgba(16, 24, 40, 0.06);
    --shadow-focus: 0 0 0 3px var(--accent-soft);
    color-scheme: light;
}

/* === base === */
* { box-sizing: border-box; }
html { background-color: var(--bg); }
body {
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 0 0 4rem;
    font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    font-size: 15px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}
.app-shell { max-width: 1440px; margin: 0 auto; padding: 0 1.75rem; }

a { cursor: pointer; color: var(--accent); }
div, ul { padding: 0; margin: 0; }
::selection { background: var(--accent-soft); }

/* === header === */
.app-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 1.75rem;
    margin: 0 0 1.75rem;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: saturate(140%) blur(10px);
    border-bottom: 1px solid var(--border);
}
.app-header .brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.01em;
    margin: 0;
}
.app-header .brand .mark {
    display: inline-grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, #9b5cff));
    color: #fff;
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 0.95rem;
    font-weight: 700;
    box-shadow: var(--shadow);
}
.app-header .brand .muted { color: var(--text-dim); font-weight: 500; }
.header-actions { display: flex; align-items: center; gap: 0.6rem; }

/* === section labels === */
.section-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    margin: 0 0 0.3rem;
}
.section-hint { color: var(--text-dim); font-size: 0.85rem; margin: 0 0 0.7rem; }

/* === buttons === */
.btn { border-radius: var(--radius-sm); font-weight: 500; transition: background-color .15s, border-color .15s, box-shadow .15s; }
.btn:focus-visible { box-shadow: var(--shadow-focus); outline: none; }
.btn-primary { background: var(--accent); border-color: var(--accent); }
.btn-primary:hover, .btn-primary:focus { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-secondary {
    background: var(--surface-2);
    border-color: var(--border-strong);
    color: var(--text);
}
.btn-secondary:hover, .btn-secondary:focus { background: var(--border); border-color: var(--border-strong); color: var(--text); }

/* === select === */
#theme {
    width: auto;
    min-width: 96px;
    background-color: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}
#theme:focus { border-color: var(--accent); box-shadow: var(--shadow-focus); }

/* === panels === */
.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* === file tabs === */
.file-names-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 0.4rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.list-group-item,
.list-group-item + .list-group-item {
    background-color: transparent;
    border: 0;
    padding: 0;
}
.file-names-list li {
    list-style: none;
    border-radius: var(--radius-sm);
    transition: background-color .12s;
}
.file-names-list li:hover { background-color: var(--accent-soft); }
.file-names-list li.active { background-color: var(--accent); }
.file-names-list a {
    display: inline-block;
    width: 100%;
    padding: 0.45rem 0.7rem;
    color: var(--text);
    text-decoration: none;
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
}
.file-names-list li.active a { color: #fff; }
.file-names-list .form-control {
    background-color: var(--surface);
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 0.8rem;
}
.file-names-list .form-control:focus { border-color: var(--accent); box-shadow: var(--shadow-focus); }
.file-names-list .form-control::placeholder { color: var(--text-dim); }
.file-names-list li:has(#new-file-name):hover { background: transparent; }
#add-file-btn { font-style: normal; color: var(--accent); text-decoration: none; padding: 0; font-size: 0.85rem; }
#add-file-btn:hover { color: var(--accent-hover); }

a.delete-file-btn {
    float: right;
    width: auto;
    font-weight: bold;
    color: var(--danger);
    padding: 0 0.4rem;
}
.rename-file input { margin-bottom: 4px; }

/* === editors === */
.file-content { display: none; }
.file-content.active { display: block; }
.file-content textarea { width: 100%; min-height: 200px; }
#twig-vars { width: 100%; }

.CodeMirror {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 4px;
    height: auto;
    min-height: 120px;
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 13px;
    line-height: 1.55;
    box-shadow: var(--shadow);
    transition: border-color .15s, box-shadow .15s;
}
.CodeMirror-focused { border-color: var(--accent); box-shadow: var(--shadow-focus); }
#twig-vars ~ .CodeMirror { min-height: 25px; }
/* cancel default-theme white background in favour of surface */
.cm-s-default.CodeMirror { box-shadow: var(--shadow); background: var(--surface); color: var(--text); }
.cm-s-default .CodeMirror-gutters { background: var(--surface-2); border-right: 1px solid var(--border); }

/* === output === */
.file-output-container { clear: both; }
.file-output {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--surface);
    padding: 4px;
}
.file-output,
.rendered-frame {
    width: 100%;
    min-height: 300px;
}
.rendered-frame {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #fff;
    box-shadow: var(--shadow);
}

@media (max-width: 600px){
    .app-header { padding: 0.8rem 1rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
    .app-shell { padding: 0 1rem; }
    .file-names-list { flex-direction: row; flex-wrap: wrap; }
    .file-contents,
    .file-names-list { float: none; width: 100%; }
}