/* Global Resets and Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* CSS Custom Properties (Modern & Calm Themes) */
:root {
    --font-primary: 'Inter', sans-serif;
    --font-code: 'Roboto Mono', monospace;

    --transition-speed: 0.3s;
    --easing-modern: cubic-bezier(0.25, 0.46, 0.45, 0.94);

    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 12px;

    --shadow-color-rgb: 100, 116, 139; /* Cool Grey for shadows */
    --shadow-xs: 0 1px 2px rgba(var(--shadow-color-rgb), 0.06);
    --shadow-sm: 0 2px 4px rgba(var(--shadow-color-rgb), 0.08);
    --shadow-md: 0 4px 8px rgba(var(--shadow-color-rgb), 0.1);
    --shadow-lg: 0 10px 15px rgba(var(--shadow-color-rgb), 0.12);

    --spacing-unit: 8px;
}

/* Theme Sky (Light & Clean) */
.theme-sky {
    --bg-primary: #F0F4F8;
    --bg-secondary: #FFFFFF;
    --bg-glass: rgba(255, 255, 255, 0.9); /* Adjusted for better opacity if used for cards */
    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --border-color: #CBD5E1;
    --border-color-focus: var(--accent-primary);
    --accent-primary: #0EA5E9;
    --accent-primary-hover: #0284C7;
    --accent-secondary: #10B981;
    --accent-error: #EF4444;
    --code-bg: #E2E8F0;
    --code-text: #334155;
    --icon-color: #64748B;
    --button-text: #FFFFFF; /* Text color for buttons with accent-primary bg */
    --shadow-color-rgb: 100, 116, 139;

    /* Canvas specific colors for light mode */
    --canvas-sky-gradient-start: '#87CEEB';
    --canvas-sky-gradient-end: '#ADD8E6';
    --canvas-cloud-color: 'rgba(255, 255, 255, 0.9)';

    /* Loader specific colors for light theme */
    --loader-overlay-bg-start: color-mix(in srgb, var(--accent-primary) 20%, var(--bg-primary) 80%);
    --loader-overlay-bg-end: color-mix(in srgb, var(--accent-secondary) 15%, var(--bg-primary) 85%);
    --loader-ring-color: var(--accent-primary);
    --loader-sparkle-color: var(--accent-secondary);
    --loader-text-color: var(--text-primary);
}

/* Theme Deep (Dark & Calm) */
.theme-deep {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-glass: rgba(30, 41, 59, 0.85); /* Adjusted for better opacity if used for cards */
    --text-primary: #E2E8F0;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border-color: #334155;
    --border-color-focus: var(--accent-primary);
    --accent-primary: #38BDF8; /* Lighter blue for dark mode accent */
    --accent-primary-hover: #0EA5E9;
    --accent-secondary: #34D399; /* Lighter green for dark mode accent */
    --accent-error: #F87171;
    --code-bg: #334155;
    --code-text: #CBD5E1;
    --icon-color: #94A3B8;
    --button-text: #0F172A; /* Dark text for light-colored accent buttons */
    --shadow-color-rgb: 0, 0, 0;

    /* Canvas specific colors for dark mode */
    --canvas-night-sky-gradient-start: '#000030';
    --canvas-night-sky-gradient-mid: '#101045';
    --canvas-night-sky-gradient-end: '#202055';
    --canvas-star-color: 'rgba(255, 255, 224, 0.9)';
    --canvas-comet-head-color: 'rgba(255, 255, 224, 1)';
    --canvas-comet-tail-mid-color: 'rgba(255, 255, 224, 0.5)';

    /* Loader specific colors for dark theme */
    --loader-overlay-bg-start: color-mix(in srgb, var(--accent-primary) 25%, var(--bg-primary) 75%);
    --loader-overlay-bg-end: color-mix(in srgb, var(--accent-secondary) 20%, var(--bg-primary) 80%);
    --loader-ring-color: var(--accent-primary);
    --loader-sparkle-color: var(--accent-secondary);
    --loader-text-color: var(--text-primary);
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    font-size: 16px;
    transition: background-color var(--transition-speed) ease-in-out, color var(--transition-speed) ease-in-out;
    padding: calc(var(--spacing-unit) * 2.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

#dynamicBackgroundCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -10;
    display: block;
}

.container {
    width: 100%;
    max-width: 800px;
    padding: calc(var(--spacing-unit) * 2);
    position: relative;
    z-index: 1;
}

.theme-switcher {
    position: fixed;
    top: calc(var(--spacing-unit) * 2);
    right: calc(var(--spacing-unit) * 2);
    z-index: 100;
    background-color: var(--bg-secondary);
    color: var(--icon-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-speed) var(--easing-modern);
}
#themeToggleBtn {
    background: none;
    border: none;
    color: inherit;
    width: 100%;
    height: 100%;
    padding: 0;
    display: flex; /* Added to center icon if needed */
    justify-content: center; /* Added */
    align-items: center; /* Added */
}
.theme-switcher:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

header {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 5);
    color: var(--text-primary);
}
header h1 {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 1);
}
header h1 .fas {
    margin-right: calc(var(--spacing-unit) * 1);
    color: var(--accent-primary);
    font-size: 0.9em;
}
.modern-sup {
    font-size: 0.5em;
    color: var(--accent-secondary);
    font-weight: 600;
    margin-left: 2px;
    vertical-align: text-top;
}
header p {
    font-size: clamp(1rem, 2.5vw, 1.1rem);
    color: var(--text-secondary);
    max-width: 550px;
    margin: 0 auto;
    font-weight: 400;
}

.card {
    background: var(--bg-secondary); /* Using opaque secondary background for cards */
    border-radius: var(--border-radius-lg);
    padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 3.5);
    margin-bottom: calc(var(--spacing-unit) * 3.5);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-speed) var(--easing-modern);
    position: relative;
    overflow: hidden;
}
.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.input-section.card,
.prompt-card.card {
    /* Inherit .card styles */
}

.error-message.card {
    background-color: color-mix(in srgb, var(--accent-error) 10%, var(--bg-secondary) 70%);
    color: var(--accent-error);
    border: 1px solid var(--accent-error);
}

.input-label {
    font-size: clamp(1.05rem, 3vw, 1.2rem);
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
}
.textarea-wrapper { position: relative; }
textarea#userGoal {
    width: 100%;
    padding: calc(var(--spacing-unit) * 1.5);
    padding-bottom: calc(var(--spacing-unit) * 3);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 400;
    resize: vertical;
    min-height: 110px;
    box-shadow: var(--shadow-xs);
    transition: all var(--transition-speed) ease-in-out;
}
textarea#userGoal:focus {
    border-color: var(--border-color-focus);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-primary) 20%, transparent), var(--shadow-xs);
    outline: none;
}
.char-counter {
    position: absolute;
    bottom: calc(var(--spacing-unit) * 0.75);
    right: calc(var(--spacing-unit) * 1.25);
    font-size: 0.8rem;
    color: var(--text-muted);
    background-color: var(--bg-primary);
    padding: 2px 5px;
    border-radius: var(--border-radius-sm);
}

.radio-group-container {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 1);
}
.radio-group {
    border: 1px solid var(--border-color);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius-md);
    /* background-color: var(--bg-secondary); */ /* Optional: if card is transparent */
}
.radio-legend {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0 calc(var(--spacing-unit) * 0.75);
    margin-left: var(--spacing-unit);
}
.radio-options {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 1.25);
    align-items: center;
    margin-top: calc(var(--spacing-unit) * 0.5);
}
.radio-option { display: flex; align-items: center; }
.radio-option input[type="radio"] {
    opacity: 0; position: fixed; width: 0;
}
.radio-option label {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-speed) var(--easing-modern);
    font-size: 0.875rem;
    box-shadow: var(--shadow-xs);
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 0.75);
}
.radio-option label .fas {
    font-size: 0.9em;
    color: var(--icon-color);
    transition: color var(--transition-speed) var(--easing-modern);
}
.radio-option input[type="radio"]:checked + label {
    background-color: var(--accent-primary);
    color: var(--button-text);
    border-color: var(--accent-primary);
    box-shadow: 0 0 8px color-mix(in srgb, var(--accent-primary) 30%, transparent);
}
.radio-option input[type="radio"]:checked + label .fas {
    color: var(--button-text);
}
.radio-option input[type="radio"]:focus-visible + label {
    outline: 2px solid var(--accent-primary);
    outline-offset: 1px;
}
.radio-option label:hover {
    border-color: var(--accent-secondary);
    color: var(--text-primary);
}

.cta-button {
    background: var(--accent-primary);
    color: var(--button-text);
    border: none;
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
    border-radius: var(--border-radius-md);
    font-size: clamp(0.95rem, 2.8vw, 1.05rem);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) var(--easing-modern);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 1);
    box-shadow: var(--shadow-sm);
    margin-top: calc(var(--spacing-unit) * 1.5);
}
.cta-button:hover {
    background: var(--accent-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.cta-button:active {
    transform: translateY(0px);
    box-shadow: var(--shadow-xs);
}
.cta-button:disabled {
    opacity: 0.6; cursor: not-allowed; transform: none; box-shadow: none;
    background: var(--text-muted);
}
.cta-button .button-icon-wrapper .fas {
    transition: transform 0.3s var(--easing-modern);
    display: inline-block; font-size: 1em;
}
.cta-button:hover .button-icon-wrapper .fas {
    transform: translateX(3px);
}
.cta-button.loading .button-icon-wrapper .fas {
    animation: modern-spin 1s infinite linear;
}
@keyframes modern-spin { to { transform: rotate(360deg); } }


/* --- AESTHETIC FULLSCREEN LOADER STYLES --- */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg,
        var(--loader-overlay-bg-start, color-mix(in srgb, var(--accent-primary) 30%, var(--bg-primary) 70%)),
        var(--loader-overlay-bg-end, color-mix(in srgb, var(--accent-secondary) 20%, var(--bg-primary) 80%))
    );
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 200;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed) ease-in-out, visibility 0s var(--transition-speed) ease-in-out;
}
.loading-overlay.visible {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
}
.aesthetic-loader-wrapper {
    position: relative;
    width: 120px;
    height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
}
.loader-pulse-ring {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: var(--loader-ring-color, var(--accent-primary));
    border-bottom-color: var(--loader-ring-color, var(--accent-primary));
    opacity: 0.8;
    animation: spinAndPulse 2s infinite ease-in-out;
    position: absolute;
}
@keyframes spinAndPulse {
    0% { transform: rotate(0deg) scale(0.8); opacity: 0.5; }
    50% { transform: rotate(180deg) scale(1); opacity: 1; }
    100% { transform: rotate(360deg) scale(0.8); opacity: 0.5; }
}
.loader-sparkle {
    position: absolute;
    width: 6px;
    height: 6px;
    background-color: var(--loader-sparkle-color, var(--accent-secondary));
    border-radius: 50%;
    opacity: 0;
    animation: sparkle-animation 2s infinite ease-in-out;
}
.loader-sparkle.s1 { top: 10px; left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.loader-sparkle.s2 { right: 10px; top: 50%; transform: translateY(-50%); animation-delay: 0.5s; }
.loader-sparkle.s3 { bottom: 10px; left: 50%; transform: translateX(-50%); animation-delay: 1s; }
.loader-sparkle.s4 { left: 10px; top: 50%; transform: translateY(-50%); animation-delay: 1.5s; }

@keyframes sparkle-animation {
    0%, 100% { opacity: 0; transform: scale(0.5); } /* Adjusted transform origin by individual positioning */
    50% { opacity: 0.9; transform: scale(1.2); }
}
.loader-text {
    margin-top: calc(var(--spacing-unit) * 3);
    color: var(--loader-text-color, var(--text-primary));
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}


/* Results Section */
#resultsSection h2 {
    font-size: clamp(1.4rem, 4vw, 1.7rem);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: calc(var(--spacing-unit) * 2.5);
    padding-bottom: calc(var(--spacing-unit) * 1);
    border-bottom: 1px solid var(--border-color);
    display: flex; align-items: center; gap: var(--spacing-unit);
}
#resultsSection h2 .fas { color: var(--accent-primary); }

.prompt-category { margin-bottom: calc(var(--spacing-unit) * 4); }
.prompt-category > h3 {
    font-size: clamp(1.15rem, 3.5vw, 1.4rem);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: calc(var(--spacing-unit) * 2);
    display: flex; align-items: center; gap: var(--spacing-unit);
}
.prompt-category > h3 .fas { color: var(--accent-secondary); }

.variation-group {
    margin-bottom: calc(var(--spacing-unit) * 3);
    padding-left: calc(var(--spacing-unit) * 1.5);
    border-left: 2px solid var(--border-color);
}
.variation-group > h4 {
    font-size: clamp(1rem, 3vw, 1.15rem);
    font-weight: 500;
    color: var(--text-secondary);
    margin: calc(var(--spacing-unit) * 1.5) 0 calc(var(--spacing-unit) * 1.2) 0;
}

.prompt-card { padding-bottom: calc(var(--spacing-unit) * 6); }
.prompt-card h4, .prompt-card h5 {
    font-size: clamp(0.95rem, 2.8vw, 1.1rem);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: calc(var(--spacing-unit) * 1);
    display: flex; align-items: center; gap: var(--spacing-unit);
}
.prompt-card h4 .fas, .prompt-card h5 .fas { color: var(--icon-color); font-size: 0.9em; }

pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius-sm);
    overflow-x: auto;
    white-space: pre-wrap; word-wrap: break-word;
    font-family: var(--font-code); font-size: 0.875rem;
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease-in-out, color var(--transition-speed) ease-in-out;
    line-height: 1.5; box-shadow: var(--shadow-xs);
}

.copy-btn {
    position: absolute;
    bottom: calc(var(--spacing-unit) * 1.5); right: calc(var(--spacing-unit) * 1.5);
    background-color: var(--accent-secondary);
    color: var(--button-text);
    border: none;
    padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-primary); font-size: 0.8rem; font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed) var(--easing-modern);
    display: flex; align-items: center; gap: calc(var(--spacing-unit) * 0.75);
    box-shadow: var(--shadow-xs);
}
.copy-btn:hover {
    background-color: color-mix(in srgb, var(--accent-secondary) 85%, black);
    transform: translateY(-1px); box-shadow: var(--shadow-sm);
}
.copy-btn .fas, .copy-btn .far { font-size: 0.9em; }
.copy-btn.copied {
    background-color: var(--accent-primary);
    transform: translateY(-1px);
    color: var(--button-text);
}
.copy-btn.copied .fa-copy { display: none; }
.copy-btn.copied .fa-check { display: inline-block !important; }

footer {
    text-align: center;
    margin-top: calc(var(--spacing-unit) * 6);
    padding-top: calc(var(--spacing-unit) * 2.5);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted); font-size: 0.875rem;
    width: 100%; max-width: 800px;
    position: relative;
    z-index: 5;
}
footer .fas.fa-code-branch {
    color: var(--accent-secondary);
    transition: transform var(--transition-speed) var(--easing-modern);
    display: inline-block;
}
footer:hover .fas.fa-code-branch { transform: rotate(15deg); }

@media (max-width: 768px) {
    body { padding: calc(var(--spacing-unit) * 1.5); }
    .container { padding: calc(var(--spacing-unit) * 1); }
    .card { padding: calc(var(--spacing-unit) * 2.5); }
    .theme-switcher { top: var(--spacing-unit) * 1.5; right: var(--spacing-unit) * 1.5; width: 40px; height: 40px; }
    #themeToggleBtn {font-size: 1rem;}
    .radio-options { gap: var(--spacing-unit); }
    .radio-option label { padding: calc(var(--spacing-unit)*0.6) calc(var(--spacing-unit)*1.1); font-size: 0.825rem;}
}
@media (max-width: 480px) {
    .cta-button { width: 100%; }
    .prompt-card { padding-bottom: calc(var(--spacing-unit) * 7); }
    .radio-options { flex-direction: column; align-items: stretch; }
    .radio-option label { justify-content: center; }
}

*:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: var(--border-radius-sm);
}
textarea#userGoal:focus-visible, #themeToggleBtn:focus-visible, .radio-option input[type="radio"]:focus-visible + label {
    outline: none;
}
.copy-btn:focus-visible {
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent-primary) 30%, transparent);
}
