/* ===== Глобальные стили ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Roboto, system-ui, sans-serif;
    background: #f8f9fa;
    color: #1e293b;
    padding: 30px 20px;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
}

.container {
    max-width: 1100px;
    width: 100%;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
    padding: 30px 35px 40px;
}

h1 {
    font-size: 28px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}
h1 small {
    font-size: 16px;
    font-weight: 400;
    color: #64748b;
}

.subtitle {
    color: #64748b;
    font-size: 15px;
    margin-bottom: 28px;
    border-bottom: 1px solid #e9edf2;
    padding-bottom: 18px;
}

/* ===== Две колонки ===== */
.row {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
}

.col {
    flex: 1 1 45%;
    min-width: 280px;
}

.col h2 {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 12px;
    color: #0f172a;
}

textarea {
    width: 100%;
    height: 180px;
    padding: 14px 16px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 15px;
    border: 1.5px solid #d1d9e6;
    border-radius: 10px;
    resize: vertical;
    transition: border-color 0.2s;
    background: #fcfcfd;
    color: #0f172a;
    line-height: 1.6;
}

textarea:focus {
    border-color: #2069b4;
    outline: none;
    box-shadow: 0 0 0 3px rgba(32, 105, 180, 0.15);
}

.preview-box {
    border: 1.5px solid #d1d9e6;
    border-radius: 10px;
    padding: 20px;
    min-height: 180px;
    background: #fafbff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: #0f172a;
    overflow-x: auto;
    position: relative;
}

.preview-box .placeholder {
    color: #94a3b8;
    font-size: 16px;
    font-style: italic;
}

.preview-box .MathJax {
    font-size: 24px;
}

/* ===== Панель действий ===== */
.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
    margin-bottom: 30px;
    align-items: center;
}

.btn {
    background: white;
    border: 1.5px solid #d1d9e6;
    padding: 8px 18px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #1e293b;
}

.btn-primary {
    background: #2069b4;
    border-color: #2069b4;
    color: white;
}
.btn-primary:hover {
    background: #1a5a9e;
    border-color: #1a5a9e;
}

.btn-outline {
    background: transparent;
    border-color: #2069b4;
    color: #2069b4;
}
.btn-outline:hover {
    background: #eef4fb;
}

.btn-success {
    background: #0b7e4a;
    border-color: #0b7e4a;
    color: white;
}
.btn-success:hover {
    background: #0a6a3e;
}

.btn-sm {
    padding: 4px 12px;
    font-size: 13px;
}

.feedback {
    margin-left: 8px;
    font-size: 14px;
    color: #0b7e4a;
    opacity: 0;
    transition: opacity 0.3s;
}
.feedback.show {
    opacity: 1;
}

/* ===== Справочник ===== */
.reference-toggle {
    background: #f1f5f9;
    border: none;
    padding: 8px 18px;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background 0.15s;
}
.reference-toggle:hover {
    background: #e2e8f0;
}

.reference-box {
    display: none;
    margin-top: 20px;
    border-top: 1px solid #e9edf2;
    padding-top: 20px;
}

.reference-box.open {
    display: block;
}

.ref-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 6px 16px;
    max-height: 300px;
    overflow-y: auto;
    padding-right: 8px;
}

.ref-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
    border-bottom: 1px solid #f1f5f9;
    font-size: 14px;
}
.ref-item .cmd {
    font-family: 'JetBrains Mono', monospace;
    background: #f1f5f9;
    padding: 0 8px;
    border-radius: 4px;
    font-size: 13px;
}
.ref-item .desc {
    color: #475569;
}
.ref-item .insert-btn {
    background: transparent;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    padding: 0 10px;
    font-size: 12px;
    cursor: pointer;
    color: #1e293b;
    transition: 0.1s;
}
.ref-item .insert-btn:hover {
    background: #e2e8f0;
}

.ref-section-title {
    font-weight: 600;
    margin: 12px 0 6px;
    color: #0f172a;
    font-size: 15px;
    grid-column: 1 / -1;
}

/* ===== Адаптив ===== */
@media (max-width: 700px) {
    .container {
        padding: 20px;
    }
    .row {
        flex-direction: column;
    }
    .col {
        flex: 1 1 100%;
    }
    textarea {
        height: 120px;
    }
}

/* ===== Утилиты ===== */
.mt-2 {
    margin-top: 8px;
}
.flex {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.gap-1 {
    gap: 6px;
}

.hint {
    font-size: 13px;
    color: #64748b;
    margin-top: 6px;
}