/****************************************************************
 * Copyright 2025 Spencer Williams
 * Use of this source code is governed by an MIT license:
 * https://github.com/sw23/fp-conv/blob/main/LICENSE
 ****************************************************************/

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #3b82f6;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --sign-color: #ef4444;
    --exponent-color: #3b82f6;
    --mantissa-color: #10b981;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    padding: 5px 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding-bottom: 10px;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-top: 10px;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.help-link {
    margin-top: 5px;
}

.help-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
}

.help-link a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    grid-auto-flow: column;
    gap: 8px;
}

@media (max-width: 1120px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-auto-flow: row;
    }
}

section {
    background: var(--surface);
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--shadow);
}

section h2 {
    color: var(--text-primary);
    font-size: 1.5em;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
}

section h3 {
    color: var(--text-primary);
    margin-bottom: 12px;
    font-size: 1.25em;
    font-weight: 600;
}

/* Introduction Section */
.about-section {
    margin-top: 10px;
}

.about-section p {
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.about-section a {
    color: var(--primary-color);
}

.about-section a:hover {
    text-decoration: underline;
}

.bullets {
    margin: 0 0 16px 0;
}

.bullets ul {
    padding-left: 24px;
    margin: 0;
    list-style-type: disc;
}

.bullets ol {
    padding-left: 24px;
    margin: 0;
}

.bullets li {
    padding: 0px;
    line-height: 1.6;
}

.bullets a {
    color: var(--primary-color);
}

.bullets a:hover {
    text-decoration: underline;
}

/* Format Configuration */
.preset-section {
    margin-bottom: 20px;
}

.preset-section label,
.section-label {
    display: block;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 10px;
    margin-bottom: 10px;
}

.preset-label {
    display: block;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 10px;
    margin-bottom: 8px;
}

.format-groups-container {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.format-group {
    display: flex;
    flex-direction: column;
    flex: 0 1 auto;
}

.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.preset-btn {
    padding: 10px;
    border: 2px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
}

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

.preset-btn.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-lg);
}

.preset-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    border-color: var(--border);
    background: var(--surface);
    color: var(--text-secondary);
}

.preset-btn:disabled:hover {
    border-color: var(--border);
    background: var(--surface);
    color: var(--text-secondary);
}

/* Output value presets - read-only indicators */
.output-value-preset {
    cursor: default;
    opacity: 1;
    background: var(--surface);
    border-color: var(--border);
    color: var(--text-secondary);
}

.output-value-preset:hover {
    background: var(--surface);
    border-color: var(--border);
}

.output-value-preset.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.format-inputs {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    align-items: stretch;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
    min-width: fit-content;
    justify-content: space-between;
}

.input-group label,
.input-label,
.output-label {
    display: block;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.input-group input[type="number"],
.input-group input[type="text"],
.input-group select {
    padding: 10px 4px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    transition: border-color 0.2s;
}

.input-group input[type="number"]:focus,
.input-group input[type="text"]:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    align-self: center;
    margin: auto;
}

.total-bits-display {
    padding: 10px 4px;
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-weight: 600;
    color: var(--primary-color);
    text-align: center;
}

/* Representation Display */
.rep-group {
    margin-top: 20px;
    margin-bottom: 20px;
}

.rep-group label,
.rep-label {
    display: block;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.binary-display {
    font-family: 'Courier New', monospace;
    padding: 0px;
    background: var(--background);
    border-radius: 8px;
    display: flex;
    gap: 2px;
    flex-wrap: wrap;
}

.bit-section-container {
    padding: 8px;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    max-width: 100%;
    overflow-x: auto;
}

.bit-section-container.sign-section {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--sign-color);
    flex-shrink: 0;
}

.bit-section-container.exponent-section {
    background: rgba(59, 130, 246, 0.1);
    border: 2px solid var(--exponent-color);
    flex-shrink: 1;
    min-width: 0;
}

.bit-section-container.mantissa-section {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--mantissa-color);
    flex-shrink: 1;
    min-width: 0;
}

.bit-labels {
    display: flex;
    gap: 0px;
    flex-wrap: wrap;
}

.bit-label {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 600;
}

.sign-section .bit-label {
    color: var(--sign-color);
}

.exponent-section .bit-label {
    color: var(--exponent-color);
}

.mantissa-section .bit-label {
    color: var(--mantissa-color);
}

.bits {
    display: flex;
    gap: 0px;
    flex-wrap: wrap;
}

.bit-positions {
    display: flex;
    gap: 0px;
    flex-wrap: wrap;
}

.bit-position {
    width: 20px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-family: monospace;
}

.bit {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 600;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.bit.checked,
input.bit:checked {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Interactive bit (checkbox input) */
input.bit {
    cursor: pointer;
    appearance: none;
    position: relative;
}

input.bit:checked::after {
    content: '1';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: bold;
    font-size: 0.9rem;
}

input.bit:not(:checked)::after {
    content: '0';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input.bit:hover {
    border-color: var(--primary-color);
    transform: scale(1.1);
}

.components {
    margin-top: 20px;
}

.components-label {
    display: block;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.component-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.component {
    padding: 12px;
    background: var(--background);
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.component label,
.component-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-family: inherit;
}

.component span:not(.component-label) {
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
    font-weight: 600;
}

/* Value Display Boxes */
.input-display,
.output-display {
    width: 100%;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    padding: 10px 4px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-weight: 600;
    color: var(--text-primary);
    box-sizing: border-box;
}

.input-display:focus {
    outline: none;
    border-color: var(--primary-color);
}

.output-binary .bit-section-container {
    opacity: 0.9;
}

.precision-loss {
    grid-column: 1 / -1;
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.precision-loss label,
.precision-loss .component-label {
    color: var(--sign-color);
}

/* Footer */
footer {
    margin-top: 40px;
    padding: 20px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .format-groups-container {
        flex-direction: column;
        gap: 0;
    }

    .format-group {
        width: 100%;
    }

    .preset-buttons {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 4px;
    }

    .preset-btn {
        width: 100%;
        padding: 10px 8px;
        font-size: 0.9rem;
    }

    .format-inputs {
        display: grid;
        grid-template-columns: repeat(6, 1fr);
        align-items: stretch;
    }

    .input-group {
        min-width: auto;
    }

    .binary-display {
        font-size: 0.9rem;
    }
}