/* Neubrutalism Theme */

:root {
    --bg-color: #fce7cd;
    /* Light cream background */
    --text-color: #111;
    --border-color: #111;
    --accent-red: #ff5252;
    --accent-blue: #4facfe;
    --accent-yellow: #ffd93b;
    --accent-green: #00d26a;
    --shadow-solid: 6px 6px 0px 0px #111;
    --shadow-solid-hover: 2px 2px 0px 0px #111;
    --shadow-solid-active: 0px 0px 0px 0px #111;
    --border-width: 3px;
}

body {
    font-family: 'Courier New', Courier, monospace;
    /* Monospaced retro feel */
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: var(--accent-yellow);
    border-bottom: var(--border-width) solid var(--border-color);
    padding: 20px 20px;
    text-align: center;
}

header h1 {
    margin: 0 0 10px 0;
    font-size: 3rem;
    font-weight: 900;
    text-transform: uppercase;
}

header p {
    margin: 0;
    font-weight: bold;
    font-size: 1.2rem;
}

main {
    padding: 30px 20px;
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

section {
    margin-bottom: 40px;
    padding: 30px;
    background-color: #fff;
    border: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-solid);
    border-radius: 0;
    /* Sharp corners for brutalism */
}

section h2 {
    margin-top: 0;
    border-bottom: var(--border-width) solid var(--border-color);
    padding-bottom: 10px;
    font-weight: 900;
    text-transform: uppercase;
    font-size: 1.8rem;
    background-color: var(--accent-blue);
    margin: -30px -30px 20px -30px;
    /* Stretch to edges */
    padding: 20px 30px;
    color: #fff;
}

/* Form Elements */
.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    font-size: 1.1rem;
    text-transform: uppercase;
}

.unit-hint {
    color: #555;
    font-weight: normal;
    font-size: 0.9em;
    margin-left: 5px;
    text-transform: none;
}

input {
    width: 100%;
    padding: 15px;
    box-sizing: border-box;
    background-color: #fff;
    border: var(--border-width) solid var(--border-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: bold;
    transition: all 0.2s ease;
}

input:focus,
input:focus-visible {
    outline: none;
    background-color: #f0f0f0;
    box-shadow: inset 4px 4px 0px 0px rgba(0, 0, 0, 0.1);
}

button {
    padding: 15px 30px;
    background-color: var(--accent-red);
    color: #fff;
    border: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-solid);
    border-radius: 0;
    cursor: pointer;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 900;
    text-transform: uppercase;
    transition: all 0.1s ease;
    display: inline-block;
}

button:hover {
    transform: translate(4px, 4px);
    box-shadow: var(--shadow-solid-hover);
}

button:active {
    transform: translate(6px, 6px);
    box-shadow: var(--shadow-solid-active);
}

#calculate-btn {
    width: 100%;
    margin-top: 15px;
    background-color: var(--accent-green);
    color: var(--text-color);
    /* Better contrast on this specific green */
}

/* Empty State */
.empty-state {
    background-color: #fff;
    border: var(--border-width) dashed var(--border-color);
    box-shadow: none;
    text-align: center;
    padding: 60px 20px;
}

.empty-content svg {
    margin-bottom: 20px;
    color: var(--text-color);
    stroke-width: 3;
}

.empty-content h2 {
    background: none;
    color: var(--text-color);
    border-bottom: none;
    margin: 0;
    padding: 0;
    font-size: 2rem;
}

.empty-content p {
    font-weight: bold;
    max-width: 400px;
    margin: 15px auto 0;
}

.card {
    padding: 20px;
    background-color: #fff;
    border: var(--border-width) solid var(--border-color);
    box-shadow: 4px 4px 0px 0px #111;
}

.card p {
    margin: 10px 0;
    font-size: 1.1rem;
    font-weight: bold;
}

#stability-results {
    margin-top: 60px;
}

#pole-plot {
    width: 100%;
    height: 400px;
    border: var(--border-width) solid var(--border-color);
    background-color: #fff;
    box-shadow: var(--shadow-solid);
    margin-bottom: 20px;
}

#3d-viewer {
    width: 100%;
    height: 400px;
    background-color: #e0e0e0;
    border: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-solid);
}

/* UX Improvements */

.error-message {
    color: var(--text-color);
    background-color: var(--accent-red);
    border: var(--border-width) solid var(--border-color);
    box-shadow: 4px 4px 0px 0px #111;
    padding: 15px;
    margin-bottom: 20px;
    font-weight: bold;
    display: none;
}

.error-message:not(:empty) {
    display: block;
}

button.loading {
    opacity: 0.8;
    cursor: not-allowed;
    position: relative;
    padding-left: 50px;
}

button.loading::after {
    content: "";
    position: absolute;
    left: 20px;
    top: 50%;
    margin-top: -10px;
    width: 16px;
    height: 16px;
    border: var(--border-width) solid var(--text-color);
    border-top: var(--border-width) solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

    100% {
        transform: rotate(360deg);
    }
}

.help-text {
    display: block;
    font-size: 0.9em;
    color: #555;
    margin-top: 8px;
    font-weight: bold;
}

input:invalid {
    background-color: #ffcccc;
}

/* Preset Buttons */
.presets {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.preset-btn {
    padding: 10px 15px;
    font-size: 0.9rem;
    background-color: #fff;
    color: var(--text-color);
    box-shadow: 4px 4px 0px 0px #111;
}

.preset-btn:hover {
    background-color: #f0f0f0;
}

.preset-btn.selected {
    background-color: var(--accent-blue);
    color: #fff;
}

/* Copy Trim Results Button */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.results-header h2 {
    margin: 0;
    border: none;
    background: none;
    color: var(--text-color);
    padding: 0;
}

.icon-btn {
    background-color: #fff;
    border: var(--border-width) solid var(--border-color);
    box-shadow: 4px 4px 0px 0px #111;
    padding: 10px 15px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: bold;
}

.icon-btn:hover {
    background-color: #f0f0f0;
}

.icon-btn svg {
    width: 18px;
    height: 18px;
    stroke-width: 3;
}

.icon-btn.success {
    background-color: var(--accent-green);
}

/* Fancy Footer (Neubrutalism) */
.site-footer {
    background-color: var(--accent-yellow);
    border-top: var(--border-width) solid var(--border-color);
    color: var(--text-color);
    padding: 60px 0 20px 0;
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    padding: 0 40px;
    box-sizing: border-box;
}

.footer-section h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    margin-top: 0;
    font-weight: 900;
    text-transform: uppercase;
}

.footer-section h4 {
    background-color: var(--text-color);
    color: #fff;
    display: inline-block;
    padding: 5px 10px;
    font-size: 1.2rem;
    margin-bottom: 20px;
    text-transform: uppercase;
    margin-top: 0;
    border: var(--border-width) solid var(--border-color);
}

.footer-section p {
    line-height: 1.6;
    margin-bottom: 20px;
    font-weight: bold;
}

.footer-section.brand p {
    color: var(--text-color);
}

.social-links a {
    color: var(--text-color);
    display: inline-block;
    transition: all 0.2s ease;
    border: var(--border-width) solid transparent;
    padding: 5px;
    background-color: #fff;
    border: var(--border-width) solid var(--border-color);
    box-shadow: 4px 4px 0px 0px #111;
}

.social-links a:hover {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0px 0px #111;
    background-color: var(--accent-red);
    color: #fff;
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: 15px;
}

.footer-section ul li a,
.portfolio-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: bold;
    border-bottom: var(--border-width) solid var(--border-color);
    transition: all 0.2s ease;
}

.footer-section ul li a:hover,
.portfolio-link:hover {
    background-color: var(--text-color);
    color: var(--accent-yellow);
}

.portfolio-link {
    background-color: #fff;
    border: var(--border-width) solid var(--border-color);
    padding: 10px 15px;
    display: inline-block;
    box-shadow: 4px 4px 0px 0px #111;
    border-bottom: var(--border-width) solid var(--border-color);
    /* Overwrite default */
}

.portfolio-link:hover {
    background-color: var(--accent-blue);
    color: #fff;
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0px 0px #111;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    margin-top: 50px;
    border-top: var(--border-width) solid var(--border-color);
    font-size: 1rem;
    font-weight: bold;
    color: var(--text-color);
    background-color: #fff;
    padding-bottom: 20px;
}

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
        text-align: left;
    }
}
/* Keyboard Shortcut Hint */
.kbd-shortcut {
    font-size: 0.8em;
    opacity: 0.8;
    margin-left: 10px;
    font-weight: normal;
    border: 1px solid rgba(0,0,0,0.2);
    padding: 2px 5px;
    display: inline-block;
    vertical-align: text-bottom;
}

/* Stale Results Visualization */
#results.stale, #visualization.stale {
    opacity: 0.6;
    filter: grayscale(100%);
    transition: opacity 0.3s, filter 0.3s;
}

#results.stale::before {
    content: "Results outdated - Recalculate";
    display: block;
    background: var(--accent-yellow);
    color: var(--text-color);
    padding: 10px;
    text-align: center;
    font-weight: bold;
    border: var(--border-width) solid var(--border-color);
    margin-bottom: 20px;
    box-shadow: 4px 4px 0px 0px #111;
}