/* Modern & Minimal Stylesheet for Turing Machine Simulator */

/* 1. CSS Variables - The foundation of our design system */
:root {
    --font-family-sans: 'Lato', sans-serif;
    --font-family-heading: 'Outfit', sans-serif;
    --font-family-mono: 'Fira Code', monospace;

    --background-color: #F8F9FA;
    --surface-color: #FFFFFF; /* Pure white for cards/panels */
    --text-color: #212529;
    --text-muted-color: #6C757D;

    --border-color: #DEE2E6;
    --border-radius: 8px;
    --border-width: 1px;

    --tape-border-color: #B0B4B8;

    --accent-color: #007BFF;
    --accent-color-hover: #0056B3;

    --success-color: #28A745;
    --warning-color: #FFC107;
    --danger-color: #DC3545;

    --success-bg: #E8F5E9;
    --warning-bg: #FFF8E1;
    --danger-bg: #FFEBEE;

    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);

    /* override daisyUI theme */
    --color-primary: oklch(62% 0.214 259.815);
    --color-primary-content: oklch(97% 0.034 272.788);
    --color-secondary: oklch(65% 0.241 354.308);
    --color-secondary-content: oklch(97% 0.028 342.258);
    --color-accent: oklch(77% 0.152 181.912);
    --color-accent-content: oklch(38% 0.063 188.416);
    --color-neutral: oklch(14% 0.005 285.823);
    --color-neutral-content: oklch(92% 0.004 286.32);
    --color-info: oklch(74% 0.16 232.661);
    --color-info-content: oklch(29% 0.066 243.157);
    --color-success: oklch(76% 0.177 163.223);
    --color-success-content: oklch(98% 0.03 173.94);
    --color-warning: oklch(87% 0.169 91.605);
    --color-warning-content: oklch(41% 0.112 45.904);
    --color-error: oklch(71% 0.194 13.428);
    --color-error-content: oklch(27% 0.105 12.094);
}

/* 2. General Body & Reset Styles */
* {
    margin: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-sans);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    font-size: 16px;
    padding-top: 1.5rem;
}

/* 3. Main App Layout & Header */
.app {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1.5rem;
}

.header {
    font-family: var(--font-family-heading);
    text-align: center;
    margin-bottom: 0.5rem;
}

.header h1 {
    font-size: 1.6rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    background: linear-gradient(45deg, var(--color-success), var(--color-primary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.header .tagline {
    color: var(--text-muted-color);
    font-weight: 300;
    font-size: 1.1rem;
}

.main-layout {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 1.5rem;
}

.left-panel, .right-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 0;
}

/* Generic section style */

/* 4. Component-Specific Styles */

.card {
    box-shadow: var(--shadow-sm);
}

.card-title {
    font-weight: 500; /* Adjust as needed */
}

.tape-content-display {
    font-family: var(--font-family-mono);
    background-color: var(--background-color);
    padding: 0.2rem 0.5rem;
    display: inline-block;
    border: 1px solid var(--border-color);
    font-weight: 500;
}

/* Tape View */
.tape-machine {
    position: relative;
    margin: 0 0 1rem;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    width: 100%;
    max-width: 100%;
    display: flex;
    justify-content: center;
    height: 70px; /* Fixed height to contain the tape */
    /* Ensure the container doesn't expand beyond its bounds */
    min-width: 0; /* Allow shrinking */
}

.tape-container {
    display: flex;
    min-height: 64px;
    align-items: center;
    justify-content: flex-start;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: transform;
    width: 100%;
    position: absolute;
    top: 50%;
    left: 0;
    transform-origin: left center;
    /* Position absolutely so the wide container doesn't affect page layout */
}

.tape-cell {
    flex-shrink: 0;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-color);
    border-left: var(--border-width) solid var(--tape-border-color);
    font-family: var(--font-family-mono);
    font-size: 1.2rem;
    font-weight: 600;
    transition: all 0.2s ease-in-out;
    font-feature-settings: "liga" 1, "calt" 1;
}

.tape-cell:last-child {
    border-right: var(--border-width) solid var(--tape-border-color);
}

.tape-cell.under-head {
    border-color: var(--accent-color);
    background-color: #eaf3fe;
    color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.2);
}

.tape-head {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    pointer-events: none;
}

.head-pointer {
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 15px solid var(--accent-color);
    filter: drop-shadow(0 2px 4px rgba(74, 144, 226, 0.3));
    margin-left: 1px; /* TODO: remove this and find why the `x` is not center. */
    margin-top: -25px; /* Adjust positioning to point at cells */
}

.head-info {
    text-align: center;
    color: var(--text-muted-color);
    font-size: 0.75rem;
    margin-top: 0.5rem;
    font-family: var(--font-family-mono);
}

.head-info-inline {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-muted-color);
    font-family: var(--font-family-mono);
    font-feature-settings: "liga" 1, "calt" 1;
}

.tape-header, .editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: var(--border-width) solid var(--border-color);
}

.tape-header h3 {
    margin: 0;
    padding: 0;
    border: none;
}

.tape-controls {
    display: flex;
    gap: 0.5rem;
}

/* Speed Control */
.speed-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.speed-control label {
    font-size: 0.9rem;
    color: var(--text-muted-color);
    font-weight: 500;
}

.speed-control select {
    padding: 0.4rem 0.6rem;
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    background-color: var(--surface-color);
    color: var(--text-color);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%236C757D%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 0.6em auto;
    cursor: pointer;
}

.speed-control select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

/* State Display */
.state-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
}

.state-item {
    padding: 0.75rem;
    background: #f0f7ff; /* Brighter shade */
    border-radius: var(--border-radius);
}

.label {
    font-weight: 600;
    color: var(--text-muted-color);
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

.value {
    font-weight: 400;
    font-size: 1.1rem;
}

.state-name {
    color: var(--accent-color);
}

.symbol {
    font-family: var(--font-family-mono);
    background: #fff;
    padding: 2px 6px;
    border-radius: 4px;
    font-feature-settings: "liga" 1, "calt" 1;
    font-weight: 500;
}

.status.running { color: var(--success-color); font-weight: 700; }
.status.halted { color: var(--danger-color); font-weight: 700; }
.status.ready { color: var(--accent-color); font-weight: 700; }

/* Control Panel & Buttons */
.controls {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Program Editor */
.program-editor {
    /* No specific styles here, inherits from .section */
}

.editor-container {
    position: relative;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.syntax-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 1rem;
    font-family: var(--font-family-mono);
    font-size: 0.95rem;
    font-weight: 400;
    line-height: 1.6;
    color: transparent;
    background: transparent;
    border: var(--border-width) solid transparent;
    border-radius: var(--border-radius);
    pointer-events: none;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow: hidden;
    z-index: 1;

    /* Enable ligatures to match textarea */
    font-feature-settings: "liga" 1, "calt" 1;
    font-variant-ligatures: common-ligatures contextual;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* CodeMirror styling */
.CodeMirror {
    font-family: var(--font-family-mono) !important;
    font-size: 0.95rem !important;
    line-height: 1.6 !important;
    border: var(--border-width) solid var(--border-color) !important;
    border-radius: var(--border-radius) !important;
    background: var(--background-color);
    color: var(--text-color) !important;
    height: auto !important;
    min-height: 300px !important;
}

.CodeMirror-scroll {
    padding: 1rem !important;
}

.CodeMirror-focused .CodeMirror-cursor {
    border-left: 2px solid var(--accent-color) !important;
}

/* Syntax highlighting for Turing machine language */
.cm-operator {
    color: #E36209;
    font-weight: 500;
}

.editor-content .cm-s-cobalt span.cm-bracket,
.cm-punctuation {
    color: #777; /* A distinct color for punctuation */
}

.editor-controls {
    margin-bottom: 1rem;
}

.editor-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.program-textarea {
    width: 100%;
    flex-grow: 1;
    padding: 1rem;
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: var(--font-family-mono);
    font-size: 0.95rem;
    font-weight: 400;
    line-height: 1.6;
    resize: none;
    background: var(--background-color);
    transition: border-color 0.2s, box-shadow 0.2s;
    color: var(--text-color);

    /* Enable ligatures for better coding experience */
    font-feature-settings: "liga" 1, "calt" 1;
    font-variant-ligatures: common-ligatures contextual;

    /* Better text rendering */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    margin-bottom: 1rem;
}

.program-textarea {
    margin-bottom: 1rem;
}

.program-selector-dropdown {
    width: 100%;
    margin-bottom: 1rem;
}

.program-status {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    margin-top: 1rem;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    border: var(--border-width) solid transparent;
}

.program-status.success {
    background-color: var(--success-bg);
    color: var(--success-color);
    border-color: var(--success-color);
}

.program-status.error {
    background-color: var(--danger-bg);
    color: var(--danger-color);
    border-color: var(--danger-color);
}

.program-status svg {
    height: 1.25rem;
    width: 1.25rem;
    margin-right: 0.5rem;
}

.program-editor .alert {
    margin-top: 1rem;
}

.program-textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
}

.program-textarea.error {
    border-color: var(--danger-color);
    background: var(--danger-bg);
}

/* Program Format Help */
.editor-help {
    position: relative; /* Establish positioning context for absolute child */
    margin-top: 1rem;
}

.editor-help button {
  border: none;
  font-size: 1.1rem;
  background-color: rgba(255, 255, 255, 0.2);
  opacity: 0.5;
  box-shadow: none;
}

.editor-help button:hover {
  opacity: 1;
}

.editor-help-link {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    font-size: 0.85rem;
    color: var(--accent-color); /* Use accent color for links */
    text-decoration: underline;
    cursor: pointer;
    z-index: 10; /* Ensure it's above the textarea */
}

.editor-help-link:hover {
    color: var(--accent-color-hover);
}

.help-section li {
  margin-bottom: 0.5rem;
}

.help-details {
    background: var(--surface-color);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-top: 1rem; /* Keep existing margin-top from .editor-help details */
}

.help-summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-color);
    padding: 0.5rem 0;
    list-style: none; /* Remove default marker */
    display: block; /* Ensure it takes full width */
}

.help-summary::-webkit-details-marker {
    display: none; /* Hide default marker for Webkit browsers */
}

.help-summary::before {
    content: '▶'; /* Custom marker */
    display: inline-block;
    width: 1em;
    margin-right: 0.5em;
    transition: transform 0.2s ease-in-out;
}

.help-details[open] .help-summary::before {
    transform: rotate(90deg);
}

.help-content {
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    margin-top: 1rem;
}

.help-heading {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.75rem;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 0.25rem;
}

.help-paragraph {
    margin-bottom: 0.75rem;
    line-height: 1.5;
    color: var(--text-color);
}

.help-list {
    list-style: disc;
    margin-left: 1.5rem;
    margin-bottom: 0.75rem;
}

.help-list-item {
    margin-bottom: 0.25rem;
    color: var(--text-color);
}

.help-code-block {
    background-color: #f8f8f8; /* Light background for code */
    border: 1px solid #ddd;
    border-left: 4px solid var(--accent-color); /* Accent border */
    padding: 1rem;
    margin-top: 0.75rem;
    margin-bottom: 1rem;
    font-family: var(--font-family-mono);
    font-size: 0.9rem;
    line-height: 1.4;
    overflow-x: auto; /* Enable horizontal scrolling for long lines */
    border-radius: var(--border-radius);
    color: #333;
}

.help-kbd {
    display: inline-block;
    padding: 0.1em 0.6em;
    font-family: var(--font-family-mono);
    font-size: 0.85em;
    line-height: 1;
    color: #444;
    background-color: #f7f7f7;
    border: 1px solid #ccc;
    border-radius: 3px;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 2px #fff inset;
    white-space: nowrap;
}

/* Graph View */
#graph-container {
    width: 100% !important;
    height: 400px !important;
    border: none !important;
    border-radius: var(--border-radius) !important;
    background: #F5F7FA !important;
}

.visualization-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tape-and-state-section {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Status Section */
.status-section {
    text-align: center;
}
.status-message {
    font-size: 1rem;
    color: var(--text-muted-color);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 1000px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .app {
        padding: 1.5rem;
    }
    .main-layout, .left-panel, .right-panel {
        gap: 1.5rem;
    }
    .card, .program-selector-section, .editor-section, .tape-view,
.state-display,
.control-panel,
.graph-view,
.multi-tape-view,
.status-section {
    /* These styles are now handled by .section */
}
    .btn {
        padding: 0.7rem 1.4rem;
        font-size: 0.9rem;
    }
}

.socials {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    display: flex;
    gap: 5px;
    z-index: 10;
}
/* Share Button Styles */
.share-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.share-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.share-url-display {
    display: flex;
    flex: 1;
    min-width: 0;
}

.share-url-display input {
    font-family: var(--font-family-mono);
    font-size: 0.75rem;
    min-width: 0;
    flex: 1;
}

.share-section .alert {
    margin-top: 0.5rem;
}

.share-section .alert svg {
    flex-shrink: 0;
    width: 1rem;
    height: 1rem;
}

/* Responsive adjustments for share functionality */
@media (max-width: 768px) {
    .share-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .share-url-display {
        width: 100%;
    }
}

/* Loading spinner for share button */
.loading.loading-spinner.loading-xs {
    width: 1rem;
    height: 1rem;
}
.share-section .btn svg {
    width: 1rem !important;
    height: 1rem !important;
}

.socials img {
    height: 20px;
}