/* Lithophane Generator - Professional Edition CSS */
/* Theming: blue primary + orange accent, with light & dark modes via CSS variables */

:root,
[data-theme="light"] {
    --primary: #1976d2;
    --primary-2: #0d47a1;
    --primary-rgb: 25, 118, 210;
    --accent: #ff9800;
    --accent-2: #f57c00;
    --accent-rgb: 255, 152, 0;

    --body-bg: linear-gradient(135deg, #e3f2fd 0%, #90caf9 100%);
    --navbar-bg: linear-gradient(90deg, #0d47a1, #1565c0);
    --card-bg: #ffffff;
    --card-muted-bg: #f1f5f9;
    --text: #1a2b3c;
    --text-muted: #5b6b7b;
    --border: #d0d9e3;
    --input-bg: #ffffff;
    --input-text: #1a2b3c;
    --preview-bg: linear-gradient(135deg, #e3f2fd, #bbdefb);
}

[data-theme="dark"] {
    --primary: #2196f3;
    --primary-2: #1565c0;
    --primary-rgb: 33, 150, 243;
    --accent: #ffa726;
    --accent-2: #fb8c00;
    --accent-rgb: 255, 167, 38;

    --body-bg: linear-gradient(135deg, #0a1929 0%, #0d2538 100%);
    --navbar-bg: linear-gradient(90deg, #061a2e, #0d3a66);
    --card-bg: #0f2942;
    --card-muted-bg: #143251;
    --text: #e3edf7;
    --text-muted: #ffff;
    --border: #244b6b;
    --input-bg: #0c2236;
    --input-text: #e8f1fb;
    --preview-bg: linear-gradient(135deg, #0c2236, #143251);
}

* {
    box-sizing: border-box;
}

body {
    background: var(--body-bg);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--text);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background 0.4s ease, color 0.4s ease;
}

.navbar {
    background: var(--navbar-bg) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* Header buttons (Help / theme toggle) */
.navbar .btn {
    border-radius: 8px;
    font-weight: 600;
}

.navbar .btn-accent {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    border: none;
    color: #1a1a1a;
}

.navbar .btn-accent:hover {
    filter: brightness(1.08);
    color: #000;
}

.navbar .btn-ghost {
    border: 2px solid rgba(255, 255, 255, 0.6);
    color: #fff;
    background: transparent;
}

.navbar .btn-ghost:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

.navbar .btn-ghost.active {
    background: rgba(255, 255, 255, 0.92);
    color: var(--primary-2);
    border-color: #fff;
}

.card {
    border: none;
    border-radius: 12px;
    overflow: hidden;
    background-color: var(--card-bg);
    color: var(--text);
    transition: all 0.3s ease, background-color 0.4s ease;
}

.card:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.18);
}

.card-body {
    background-color: var(--card-bg);
    color: var(--text);
}

.card-header {
    background: linear-gradient(90deg, var(--primary), var(--primary-2)) !important;
    color: white;
    border-bottom: none;
    padding: 2rem;
}

.card-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
}

.card-header p {
    font-size: 1rem;
    margin-top: 0.5rem !important;
}

.card-header.bg-light {
    background: var(--card-muted-bg) !important;
    color: var(--text);
    padding: 0.75rem 1rem;
}

.card-header h6 {
    margin: 0;
    font-size: 0.95rem;
}

.card-header.border-secondary {
    border-color: var(--border) !important;
}

.card-header.border-info {
    border-color: var(--primary) !important;
}

.card.border-secondary,
.card.border-info {
    border: 2px solid var(--border) !important;
}

.form-label {
    color: var(--text);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-control,
.form-select,
.input-group .form-control {
    border-radius: 8px;
    border: 2px solid var(--border);
    background-color: var(--input-bg);
    color: var(--input-text);
    padding: 0.75rem;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.form-control:focus,
.form-select:focus {
    background-color: var(--input-bg);
    color: var(--input-text);
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(var(--primary-rgb), 0.25);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-range {
    height: 6px;
    border-radius: 3px;
}

.form-range::-webkit-slider-thumb {
    width: 20px;
    height: 20px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.form-range::-webkit-slider-runnable-track {
    background: linear-gradient(90deg, var(--border), var(--primary), var(--border));
    border-radius: 3px;
}

.form-range::-moz-range-track {
    background: linear-gradient(90deg, var(--border), var(--primary), var(--border));
    border-radius: 3px;
}

.input-group .input-group-text {
    background-color: var(--card-muted-bg);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-weight: 500;
    color: var(--primary);
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary), var(--primary-2));
    border: none;
    border-radius: 8px;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: all 0.3s ease;
}

.btn-primary:hover,
.btn-primary:focus {
    background: linear-gradient(90deg, var(--primary-2), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(var(--primary-rgb), 0.4);
    color: white;
}

/* Generate button uses the orange accent so it stands out */
.btn-success {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    border: none;
    border-radius: 8px;
    font-weight: 600;
    color: #1a1a1a;
    padding: 0.75rem 1.5rem;
    transition: all 0.3s ease;
}

.btn-success:hover,
.btn-success:focus {
    background: linear-gradient(90deg, var(--accent-2), var(--accent));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(var(--accent-rgb), 0.45);
    color: #000;
}

.btn-outline-primary {
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: 6px;
    background-color: transparent;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 3px 10px rgba(var(--primary-rgb), 0.3);
}

.btn-outline-primary.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.5);
    font-weight: 600;
}

.preset-btn.btn-primary {
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-color: var(--primary-2);
    color: white;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.5);
}

.preset-btn.btn-primary:hover {
    background: linear-gradient(90deg, var(--accent), var(--primary));
    border-color: var(--primary);
    box-shadow: 0 6px 15px rgba(var(--primary-rgb), 0.6);
}

.btn-outline-info {
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline-info:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.btn-outline-secondary {
    color: var(--primary);
    border-color: var(--primary);
    border-radius: 8px;
}

.btn-outline-secondary:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
}

.btn-lg {
    font-size: 0.7rem;
    padding: 0.3rem 0.5rem;
    min-width: 120px;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.55rem;
}

.btn-group {
    gap: 0.5rem;
}

.bg-gradient {
    background: linear-gradient(90deg, var(--primary), var(--primary-2)) !important;
}

.bg-light {
    background-color: var(--card-muted-bg) !important;
    color: var(--text);
}

#previewContainer {
    background: var(--preview-bg);
    border-radius: 12px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.08);
}

#previewContainer img,
#heightmapCanvas {
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
}

#heightmapCanvas:hover {
    transform: scale(1.02);
}

.spinner-border {
    width: 5rem;
    height: 5rem;
    border-width: 5px;
    color: var(--primary);
}

.text-info {
    color: var(--accent) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}

.form-check-input {
    border: 2px solid var(--border);
    background-color: var(--input-bg);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-check-input:checked {
    background-color: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(var(--primary-rgb), 0.25);
}

.form-check-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(var(--primary-rgb), 0.25);
}

.form-check-label {
    cursor: pointer;
    user-select: none;
    color: var(--text);
}

.progress {
    background-color: var(--card-muted-bg);
    border-radius: 8px;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary), var(--accent)) !important;
}

/* Modal theming (3D preview, etc.) */
.modal-content {
    background-color: var(--card-bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.modal-header,
.modal-footer {
    border-color: var(--border);
}

/* On small screens, keep any modal body within the viewport and let it scroll */
@media (max-width: 576px) {
    .modal-body {
        max-height: 80vh;
        overflow-y: auto;
    }
}

footer {
    margin-top: auto;
    border-top: 1px solid var(--border);
}

/* Footer matches the header navbar colors */
.app-footer {
    background: var(--navbar-bg) !important;
    color: #fff;
}

.app-footer .text-muted {
    color: rgba(255, 255, 255, 0.7) !important;
}

.app-footer h5,
.app-footer h6 {
    color: #fff;
}

/* Donate page */
.donate-preset {
    display: block;
    background: var(--card-muted-bg);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 18px 12px;
    text-align: center;
    text-decoration: none;
    color: var(--text);
    transition: all 0.18s ease;
}

.donate-preset:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: 0 6px 18px rgba(var(--accent-rgb), 0.3);
    color: var(--text);
    text-decoration: none;
}

.donate-preset .amt {
    font-size: 26px;
    font-weight: 800;
    color: var(--accent);
}

.donate-preset .lbl {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.paypal-btn {
    background: #ffc439;
    color: #003087;
    font-weight: 700;
    border: 0;
    border-radius: 10px;
    padding: 11px 18px;
    width: 100%;
    cursor: pointer;
    transition: filter 0.12s ease, transform 0.12s ease;
}

.paypal-btn:hover {
    filter: brightness(1.05);
    transform: translateY(-1px);
    color: #003087;
}

.wechat-bar {
    background: #07c160;
    color: #fff;
    padding: 8px 18px;
    border-radius: 999px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

/* Footer Styling */
footer h6 {
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Two-column footer lists (Contact & Other Projects) */
.app-footer h6 {
    font-size: 0.85rem;
}

.footer-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.2rem 0;
    margin-bottom: 0;
    font-size: 0.8rem;
}

.footer-list .footer-ic {
    width: 1.1rem;
    font-size: 0.85rem;
    text-align: center;
    color: var(--accent);
    flex: 0 0 auto;
}

.footer-list a {
    color: #fff;
    text-decoration: none;
    transition: color 0.25s ease;
}

.footer-list a:hover {
    color: var(--accent);
    text-decoration: underline;
}

.contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    background-color: rgba(var(--primary-rgb), 0.18);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.contact-item:hover {
    background-color: rgba(var(--accent-rgb), 0.25);
    transform: translateY(-2px);
}

.contact-icon {
    font-size: 1.1rem;
    min-width: 1.2rem;
}

.contact-item a {
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: var(--accent) !important;
}

footer .badge {
    font-size: 0.9rem;
    padding: 0.5rem 0.75rem;
    background-color: var(--primary) !important;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
}

footer .badge:hover {
    background-color: var(--accent) !important;
    color: #1a1a1a !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(var(--accent-rgb), 0.4);
}

/* Responsive improvements */
@media (max-width: 992px) {
    .card-header h1 {
        font-size: 1.5rem;
    }

    .btn-lg {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    .d-grid {
        gap: 0.5rem;
    }
}

@media (max-width: 768px) {
    .card-header {
        padding: 1.5rem;
    }

    .card-header h1 {
        font-size: 1.3rem;
    }

    .btn-sm {
        flex: 1 1 calc(50% - 0.25rem);
    }

    .btn-group.flex-wrap .btn {
        flex: 1 1 calc(50% - 0.25rem);
    }
}

/* Smooth animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: slideIn 0.5s ease-out;
}

#previewContainer {
    animation: slideIn 0.3s ease-out;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.spinner-border {
    animation: spin 1s linear infinite !important;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#statusDiv {
    padding: 3rem 2rem;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.12), rgba(var(--accent-rgb), 0.12));
    border-radius: 12px;
    border: 2px solid rgba(var(--primary-rgb), 0.3);
    box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.15);
}

#statusText {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text);
    margin-top: 1.5rem;
    letter-spacing: 0.5px;
}

/* Collapse/expand styling */
.collapse {
    transition: all 0.3s ease;
}

.collapsing {
    transition: height 0.3s ease;
}

/* Small text improvements */
small {
    font-size: 0.85rem;
    opacity: 0.9;
}

/* Better spacing for form groups */
.mb-3 {
    margin-bottom: 1rem;
}

.mb-4 {
    margin-bottom: 1.5rem;
}

/* Table and list styling */
ul, li {
    margin-bottom: 0.5rem;
}

/* Accessibility improvements */
a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent);
    text-decoration: underline;
}

/* Shape overlay styling */
#shapeOverlay {
    background: transparent !important;
    cursor: grab;
    user-select: none;
}

#shapeOverlay:active {
    cursor: grabbing;
}

/* Help document styling */
.help-section {
    scroll-margin-top: 90px;
}

.help-toc a {
    display: block;
    padding: 0.25rem 0;
}

/* Print-friendly adjustments */
@media print {
    body {
        background: white;
    }

    .navbar, footer {
        display: none;
    }
}