:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --card-background-color: #ffffff;
    --text-color: #333;
    --border-color: #dee2e6;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

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

.top-nav { margin-left: auto; }

.nav-btn {
    display: inline-block;
    padding: 10px 14px;
    background: linear-gradient(180deg, #3aa0ff 0%, #007bff 100%);
    color: #fff;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);
    transition: transform 0.07s ease, box-shadow 0.12s ease;
}

.nav-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 10px rgba(0,0,0,0.14); }

/* group of nav buttons (keeps them inline and responsive) */
.nav-group {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}
.nav-group .nav-btn { white-space: nowrap; }


header h1 {
    font-size: 2.5em;
    margin-bottom: 0.2em;
}

.card {
    background-color: var(--card-background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--box-shadow);
}

.card h2 {
    margin-top: 0;
    font-size: 1.5em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.control-group {
    margin-bottom: 20px;
}

.control-group-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.control {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 150px;
}

label {
    font-weight: bold;
    margin-bottom: 5px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: normal;
}

input[type="file"],
input[type="number"],
input[type="range"],
select,
textarea,
button {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
    box-sizing: border-box;
}

input[type="checkbox"] {
    width: auto;
}

input:disabled, .slider-container input:disabled + span {
    opacity: 0.5;
    cursor: not-allowed;
}

textarea {
    resize: vertical;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}

.preview-area {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
    margin-bottom: 20px;
}

.canvas-container {
    display: flex;
    flex-direction: column;
}

canvas {
    border: 1px solid var(--border-color);
    background-color: #fff;
}

#fontInfo {
    background-color: #e9ecef;
    padding: 10px;
    border-radius: var(--border-radius);
    word-break: break-all;
    width: 100%;
    box-sizing: border-box;
    font-size: 0.9em;
    margin-bottom: 20px;
}

#progressMsg {
    margin-top: 10px;
    font-style: italic;
    color: var(--secondary-color);
}

.previews-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-start;
}

/* Gallery modal */
.modal { display: none; position: fixed; inset: 0; z-index: 1200; }
.modal[aria-hidden="false"] { display: block; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.6); }
.modal-content { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); background: #fff; max-width: 960px; width: calc(100% - 40px); border-radius: 10px; padding: 14px 18px 18px; box-shadow: 0 12px 48px rgba(0,0,0,0.35); max-height: 90vh; overflow: auto; }
.modal-close { position: absolute; right: 12px; top: 10px; border: none; background: transparent; font-size: 26px; cursor: pointer; }
.modal img { max-width: 100%; display:block; margin: 8px 0; }
.modal .meta { margin-top: 6px; }
.modal .controls { margin-top: 12px; display:flex; gap:8px; }

.card .meta .size { color: var(--secondary-color); font-size: 0.9em; margin-top:6px; }

/* Tree view for gallery */
.family-node { margin-bottom: 18px; border-bottom: 1px solid var(--border-color); padding-bottom: 10px; }
.family-header, .type-header {
    display: inline-block;
    background: var(--card-background-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 700;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
    transition: background 0.12s ease, transform 0.08s ease;
}
.family-header { font-size: 1.1em; }
.family-header:hover, .type-header:hover { transform: translateY(-1px); background: linear-gradient(180deg, #fff, #f6f6f6); }
.type-node { margin: 8px 0 12px 12px; }
.type-body { margin-top: 8px; }
.sizes-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.sizes-grid .card { margin: 0; }

.text-preview-container {
    flex: 1;
    min-width: 200px;
}

#previewCanvas {
    width: 100%;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--secondary-color);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 600px) {
    .control-group-inline {
        flex-direction: column;
    }
    .previews-container {
        flex-direction: column;
    }
    .header-top { flex-direction: column; align-items: flex-start; }
    /* keep nav buttons next to each other on small screens */
    .nav-group { width: 100%; justify-content: flex-start; gap: 6px; }
    .nav-group .nav-btn { flex: 0 1 auto; min-width: 80px; padding: 7px 10px; font-size: 14px; }
    .top-link { margin: 12px 0 20px; }
}