:root {
    /* @tweakable primary color for buttons and key UI elements */
    --primary-color: #ED682B;
    /* @tweakable secondary color for accents and highlights */
    --secondary-color: #F5945E;
    /* @tweakable accent color for call-to-action elements */
    --accent-color: #fd79a8;

    /* Light Mode Colors (for future toggle) */
    --light-bg: #f8f9fa;
    --light-card-bg: #ffffff;
    --light-text-primary: #212529; 
    --light-text-secondary: #6c757d; 

    /* @tweakable dark mode background color */
    --dark-bg: #121212;
    /* @tweakable dark mode card background color */
    --dark-card-bg: #1e1e1e;
    /* @tweakable dark mode primary text color */
    --dark-text-primary: #ffffff;
    /* @tweakable dark mode secondary text color */
    --dark-text-secondary: #a0a0a0;

    --success-color: #48c78e;
    --warning-color: #ffe08a;
    --error-color: #f14668;
    /* @tweakable border radius for cards and buttons */
    --border-radius: 4px;
    /* @tweakable shadow for cards and elements */
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s ease;

    /* @tweakable base font size */
    --base-font-size: 16px;
    /* @tweakable spacing unit used for margins and padding */
    --spacing-unit: 8px;
    /* @tweakable heading font family */
    --heading-font: 'Bebas Neue', sans-serif;
    /* @tweakable primary font family */
    --primary-font: 'Space Grotesk', sans-serif;
    /* @tweakable secondary font family */
    --body-font: 'Raleway', sans-serif;
    /* @tweakable heading font weight */
    --heading-font-weight: 400;
    /* @tweakable body font weight */
    --body-font-weight: 300;
}

/* Apply dark mode by default */
html.dark-mode {
    --bg-color: var(--dark-bg);
    --card-bg: var(--dark-card-bg);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --input-bg: rgba(0, 0, 0, 0.2);
    --border-color: rgba(255, 255, 255, 0.1);
    --border-color-light: rgba(255, 255, 255, 0.05);
}

/* Optional: Add light mode styles */
html.light-mode {
    --bg-color: var(--light-bg);
    --card-bg: var(--light-card-bg);
    --text-primary: var(--light-text-primary);
    --text-secondary: var(--light-text-secondary);
    --input-bg: rgba(0, 0, 0, 0.05);
    --border-color: rgba(0, 0, 0, 0.1);
    --border-color-light: rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--primary-font);
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: var(--base-font-size);
    transition: background-color 0.3s ease, color 0.3s ease; 
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: var(--heading-font-weight);
    letter-spacing: 1px;
    color: var(--text-primary); 
}

p {
    font-family: var(--body-font); 
    font-weight: var(--body-font-weight);
    color: var(--text-secondary); 
    margin-bottom: var(--spacing-unit);
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 4);
}

.header {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.header h1 {
    color: var(--text-primary);
    font-size: 3rem;
    margin-bottom: calc(var(--spacing-unit));
    letter-spacing: 2px;
    text-transform: uppercase;
}

.header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
    font-weight: var(--body-font-weight);
    font-family: var(--body-font);
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing-unit) * 4);
    align-items: start; 
}

@media (max-width: 992px) { 
    .main-content {
        grid-template-columns: 1fr;
    }
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: calc(var(--spacing-unit) * 3);
    transition: var(--transition);
    border: 1px solid var(--border-color-light);
    height: 100%; 
}

.card:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2); 
}

.card-header {
    margin-bottom: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--border-color-light);
    padding-bottom: calc(var(--spacing-unit));
}

.card-header h2 {
    color: var(--text-primary);
    font-size: 1.8rem;
    letter-spacing: 1.5px;
}

.upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 4);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background-color: rgba(237, 104, 43, 0.05);
    margin-bottom: calc(var(--spacing-unit) * 2);
    display: flex; 
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.upload-area:hover {
    background-color: rgba(237, 104, 43, 0.1);
    border-color: var(--secondary-color); 
}

.upload-area.active {
    border-color: var(--success-color);
    background-color: rgba(72, 199, 142, 0.1);
}

.upload-icon {
    width: 48px; 
    height: 48px;
    stroke: var(--primary-color); 
    margin-bottom: calc(var(--spacing-unit) * 1.5); 
}

.upload-text {
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-weight: var(--body-font-weight);
    font-family: var(--body-font);
    color: var(--text-secondary); 
}

.upload-input {
    display: none;
}

.upload-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
    border-radius: calc(var(--border-radius) / 2);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.9rem;
    margin-top: var(--spacing-unit); 
}

.upload-btn:hover {
    background-color: var(--secondary-color); 
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2); 
}

.image-preview {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin-top: calc(var(--spacing-unit) * 2); 
    margin-bottom: calc(var(--spacing-unit) * 2);
    border: 1px solid var(--border-color-light); 
    display: block; 
}

.analysis-section {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.analysis-section h3 {
    color: var(--secondary-color); 
    margin-bottom: calc(var(--spacing-unit));
    font-size: 1.4rem;
    font-weight: 400;
    letter-spacing: 1px;
    border-bottom: 1px solid var(--border-color-light); 
    padding-bottom: calc(var(--spacing-unit) / 2);
}

.analysis-section p {
    margin-bottom: calc(var(--spacing-unit));
    font-weight: var(--body-font-weight);
    font-family: var(--body-font);
    color: var(--text-secondary); 
}

.analysis-section strong {
    font-weight: 500;
    color: var(--text-primary); 
}

.color-palette {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 1.5); 
    margin-bottom: calc(var(--spacing-unit) * 2);
    align-items: flex-end; 
}

.color-swatch {
    width: 40px; 
    height: 40px;
    border-radius: 50%; 
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    position: relative; 
    margin-bottom: 24px; 
    transition: var(--transition);
    border: 2px solid var(--card-bg); 
    cursor: default; 
}

.color-swatch:hover {
    transform: scale(1.1); 
    border-color: var(--text-secondary); 
}

.color-code {
    position: absolute;
    bottom: -20px; 
    left: 50%; 
    transform: translateX(-50%); 
    width: max-content; 
    text-align: center;
    font-size: 0.75rem; 
    color: var(--text-secondary);
    font-family: monospace;
    background-color: var(--card-bg); 
    padding: 0 4px;
    border-radius: 2px;
    opacity: 0.8;
}

.style-tags {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit));
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.tag {
    background-color: var(--secondary-color);
    color: white;
    padding: calc(var(--spacing-unit) / 2) calc(var(--spacing-unit) * 1.5);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    transition: background-color 0.2s ease;
}
.tag:hover {
    background-color: var(--primary-color); 
}

.prompt-container {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.prompt-text {
    width: 100%;
    min-height: 150px; 
    border: 1px solid var(--border-color); 
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 2);
    resize: vertical; 
    font-family: monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: calc(var(--spacing-unit) * 1.5); 
    background-color: var(--input-bg); 
    color: var(--text-primary); 
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.prompt-text:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(237, 104, 43, 0.25); 
}

.prompt-controls {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 2);
    flex-wrap: wrap; 
}

.button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: calc(var(--spacing-unit) * 1.2) calc(var(--spacing-unit) * 2.5); 
    border-radius: calc(var(--border-radius) / 2);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: calc(var(--spacing-unit));
    font-size: 0.9rem;
    text-transform: uppercase; 
    letter-spacing: 0.5px;
}
.button svg {
    width: 16px;
    height: 16px;
}

.button:hover:not(:disabled) { 
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.button.secondary {
    background-color: var(--secondary-color);
}
.button.secondary:hover:not(:disabled) {
    background-color: var(--primary-color); 
}

.button.accent {
    background-color: var(--accent-color);
}
.button.accent:hover:not(:disabled) {
    opacity: 0.85;
}

.button.outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.button.outline:hover:not(:disabled) {
    background-color: rgba(237, 104, 43, 0.1);
    color: var(--secondary-color); 
    border-color: var(--secondary-color);
}

.loading-spinner {
    display: block; 
    width: 60px; 
    height: 60px;
    margin: calc(var(--spacing-unit) * 4) auto;
}

.loading-spinner:after {
    content: " ";
    display: block;
    width: 48px; 
    height: 48px;
    border-radius: 50%;
    border: 5px solid var(--primary-color); 
    border-color: var(--primary-color) transparent var(--primary-color) transparent;
    animation: spinner 1.2s linear infinite;
}

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

.saved-analyses {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit));
    margin-top: var(--spacing-unit);
}

.saved-analysis {
    cursor: pointer;
    transition: var(--transition);
    position: relative; 
}

.saved-analysis:hover {
    transform: scale(1.05);
}

.saved-analysis img {
    display: block; 
    border: 2px solid transparent;
    transition: var(--transition);
    border-radius: calc(var(--border-radius) / 2); 
}

.saved-analysis:hover img {
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(237, 104, 43, 0.5); 
}

/* Tooltip Styles */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltip-text {
    visibility: hidden;
    width: max-content; 
    max-width: 200px; 
    background-color: #333; 
    color: #fff;
    text-align: center;
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 1.5); 
    position: absolute;
    z-index: 10; 
    bottom: 115%; 
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    font-size: 0.85rem; 
    font-family: var(--body-font); 
    font-weight: 400; 
    pointer-events: none; 
    white-space: normal; 
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

/* Arrow for Tooltip */
.tooltip .tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%; 
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #333 transparent transparent transparent;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 0.95; 
}

/* --- Settings Row Styles --- */
.settings-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: calc(var(--spacing-unit) * 1.5); 
    padding-bottom: calc(var(--spacing-unit));
    gap: var(--spacing-unit) * 2; 
}

.settings-label {
    font-weight: 500;
    color: var(--text-secondary);
    flex-shrink: 0; 
    display: inline-flex; 
    align-items: center;
}

.settings-control {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.5); 
    flex-grow: 1; 
}
.settings-control span {
    font-size: 0.9rem;
    color: var(--text-secondary);
    min-width: 60px; 
    text-align: right;
}

/* --- Slider Styles --- */
.slider {
    -webkit-appearance: none;
    appearance: none; 
    width: 100%;
    height: 8px; 
    border-radius: 5px;
    background: var(--input-bg); 
    outline: none;
    transition: background 0.3s ease;
    cursor: pointer;
}
.slider:hover {
    background: rgba(237, 104, 43, 0.2); 
}

/* Slider Thumb (Chrome, Edge, Safari) */
.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px; 
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid var(--card-bg); 
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15); 
    background: var(--secondary-color); 
}

/* Slider Thumb (Firefox) */
.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid var(--card-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.slider::-moz-range-thumb:hover {
    transform: scale(1.15);
    background: var(--secondary-color);
}

/* --- Empty State Styles --- */
.empty-state {
    text-align: center;
    padding: calc(var(--spacing-unit) * 6) 0; 
    color: var(--text-secondary);
    border: 2px dashed var(--border-color); 
    border-radius: var(--border-radius);
    margin-top: var(--spacing-unit) * 2;
}

.empty-state p {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    font-weight: 300;
    font-size: 1rem;
    max-width: 80%;
    margin-left: auto;
    margin-right: auto;
}

.empty-state-small {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: var(--spacing-unit) * 2;
    text-align: center;
}

/* --- Footer Styles --- */
.footer {
    text-align: center;
    margin-top: calc(var(--spacing-unit) * 6);
    padding-top: calc(var(--spacing-unit) * 2);
    border-top: 1px solid var(--border-color-light);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 300;
}

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
    :root {
        --base-font-size: 14px;
    }

    .app-container {
        padding: calc(var(--spacing-unit) * 2);
    }

    .header h1 {
        font-size: 2.2rem; 
    }
    .header p {
        font-size: 1rem;
    }

    .main-content {
        gap: calc(var(--spacing-unit) * 3); 
    }

    .card {
        padding: calc(var(--spacing-unit) * 2.5); 
    }

    .prompt-controls {
        flex-direction: column; 
        align-items: stretch; 
    }

    .button {
        width: 100%; 
        justify-content: center; 
    }

    .settings-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-unit);
    }
    .settings-control {
        width: 100%;
    }
    .settings-control span {
        text-align: left;
        min-width: auto;
    }
}