/* =================================================================================
    CSS Variables for Theming and Consistency
    - Manages colors, fonts, and shadows for both light and dark themes.
    - Simplifies theme switching and maintains a consistent design language.
====================================================================================
*/
:root {
    --font-quote: 'Merriweather', serif;
    --font-ui: 'Poppins', sans-serif;

    /* Light Theme Palette (Shades of Blue) */
    --bg-color-light: #f0f2f5; 
    --card-bg-light: rgba(255, 255, 255, 0.95);
    --text-color-light: #1f2937;
    --author-color-light: #4b5563;
    --primary-color-light: #3b82f6; 
    --primary-hover-light: #2563eb; 
    --secondary-color-light: #60a5fa; 
    --modal-link-color-light: #1d4ed8;
    --shadow-color-light: rgba(59, 130, 246, 0.2); 
    --icon-color-light: #374151;
    --border-color-light: rgba(0, 0, 0, 0.1);

    /* Dark Theme Palette (Muted Grays) */
    --bg-color-dark: #111827; 
    --card-bg-dark: rgba(31, 41, 55, 0.95);
    --text-color-dark: #f3f4f6;
    --author-color-dark: #9ca3af;
    --primary-color-dark: #4b5563; 
    --primary-hover-dark: #374151; 
    --secondary-color-dark: #374151; 
    --modal-link-color-dark: #f9fafb;
    --shadow-color-dark: rgba(156, 163, 175, 0.1); 
    --icon-color-dark: #f0f0f0;
    --border-color-dark: rgba(255, 255, 255, 0.1);
}

/* Applying theme variables based on the <html> data-theme attribute */
html[data-theme='light'] {
    --bg-color: var(--bg-color-light);
    --card-bg: var(--card-bg-light);
    --text-color: var(--text-color-light);
    --author-color: var(--author-color-light);
    --primary-color: var(--primary-color-light);
    --primary-hover: var(--primary-hover-light);
    --secondary-color: var(--secondary-color-light);
    --modal-link-color: var(--modal-link-color-light);
    --shadow-color: var(--shadow-color-light);
    --icon-color: var(--icon-color-light);
    --border-color: var(--border-color-light);
}

html[data-theme='dark'] {
    --bg-color: var(--bg-color-dark);
    --card-bg: var(--card-bg-dark);
    --text-color: var(--text-color-dark);
    --author-color: var(--author-color-dark);
    --primary-color: var(--primary-color-dark);
    --primary-hover: var(--primary-hover-dark);
    --secondary-color: var(--secondary-color-dark);
    --modal-link-color: var(--modal-link-color-dark);
    --shadow-color: var(--shadow-color-dark);
    --icon-color: var(--icon-color-dark);
    --border-color: var(--border-color-dark);
}

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

/* =================================================================================
    General Body and Layout Styling
====================================================================================
*/

body {
    font-family: var(--font-ui);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1.5rem;
    color: var(--text-color);
    background-color: var(--bg-color); 
    transition: background-color 0.5s ease-in-out, color 0.5s ease-in-out;
}

/* =================================================================================
    Main Quote Container and Card Styling
====================================================================================
*/
.quote-container {
    text-align: center;
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: 0 10px 30px -5px var(--shadow-color);
    width: 100%;
    max-width: 700px;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}

.quote-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 1.5rem;
    color: var(--text-color);
    text-align: left;
}

.header-buttons {
    display: flex;
    gap: 0.75rem;
}

/* Styling for icon-only buttons in the header */
.icon-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--icon-color);
    transition: transform 0.2s ease, color 0.2s ease;
}

.icon-btn:hover {
    transform: scale(1.15);
    color: var(--primary-color);
}

/* Style for the favorited heart icon */
#favorite-btn.favorited {
    color: #e74c3c; /* Red color when active */
}
#favorite-btn.favorited:hover {
    color: #c0392b; /* Darker red on hover */
}

/* =================================================================================
    Quote and Author Text Styling
====================================================================================
*/

.quote-box {
    margin-bottom: 2.5rem;
    min-height: 150px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* Quote text with fade-in/out animation */
#quote-text {
    font-family: var(--font-quote);
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    font-style: italic;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    opacity: 1;
    transition: opacity 0.5s ease-in-out;
}

#quote-text.fade-out {
    opacity: 0;
}

/* Author text with clickable span */
#quote-author {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--author-color);
    transition: color 0.3s ease;
}

#quote-author span {
    cursor: pointer;
    padding-bottom: 2px;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s;
}

#quote-author span:hover {
    border-color: var(--primary-color);
}

/* =================================================================================
    Action Button Styling
====================================================================================
*/

.button-container {
    display: flex;
    flex-wrap: wrap; /* Allows buttons to wrap on smaller screens */
    gap: 0.75rem;
    justify-content: center;
    align-items: stretch;
}

/* General button class with hover micro-interactions */
.btn {
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-family: var(--font-ui);
    font-weight: 600;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px -5px var(--shadow-color);
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 7px 20px -5px var(--shadow-color);
}

.btn:active:not(:disabled) {
    transform: translateY(-1px);
}

.btn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
    opacity: 0.7;
}

/* Primary button (New Quote) is larger */
.btn-primary {
    background-color: var(--primary-color);
    flex-grow: 2;
    flex-basis: 200px;
}
.btn-primary:hover:not(:disabled) { background-color: var(--primary-hover); }

/* Secondary buttons (Previous, Copy, Tweet) */
.btn-secondary {
    background-color: var(--secondary-color);
    flex-grow: 1;
}

.secondary-buttons {
    display: flex;
    gap: 0.75rem;
    flex-grow: 1;
}

.secondary-buttons .btn {
    flex-grow: 1; /* Make copy and tweet buttons equal width */
    padding: 0.75rem 1rem; /* Slightly less padding for smaller buttons */
}
.secondary-buttons .btn i {
    font-size: 1.2rem;
}


#error-message {
    color: #d93025;
    font-weight: bold;
}

/* =================================================================================
    Modal Styling (for Author and Favorites)
====================================================================================
*/

/* Semi-transparent background overlay */
#modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* Modal popup with scale-up animation */
#author-modal, .favorites-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background-color: var(--card-bg);
    color: var(--text-color);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 5px 25px rgba(0,0,0,0.3);
    z-index: 101;
    width: 90%;
    max-width: 500px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    text-align: left;
}

#modal-overlay.visible,
#author-modal.visible,
.favorites-modal.visible {
    opacity: 1;
    visibility: visible;
}

#author-modal.visible,
.favorites-modal.visible {
    transform: translate(-50%, -50%) scale(1);
}

#modal-close-btn, .fav-modal-close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    font-size: 2.0em;
    cursor: pointer;
    color: var(--author-color);
    transition: color 0.2s ease, transform 0.2s ease;
}

#modal-close-btn:hover, .fav-modal-close-btn:hover {
    color: var(--primary-color);
    transform: rotate(90deg);
}

/* Content styling within the modals */
#modal-author-name a {
    color: var(--modal-link-color);
    text-decoration: none;
    font-size: 1.75em;
    transition: color 0.2s ease;
}
#modal-author-name a:hover { 
    text-decoration: underline; 
    color: var(--primary-color);
}

#modal-author-title { font-style: italic; color: var(--author-color); }

#modal-flags-container img {
    width: 40px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin: 15px 10px 15px 0;
}
.favorites-modal h2 { margin-bottom: 1rem; }
.favorites-modal ul { list-style: none; max-height: 60vh; overflow-y: auto; }
.favorites-modal li { padding: 1rem 0; border-bottom: 1px solid var(--border-color); }
.favorites-modal li:last-child { border-bottom: none; }
.favorites-modal p { font-family: var(--font-quote); font-style: italic; }
.favorites-modal strong { display: block; margin-top: 0.5rem; color: var(--author-color); }
.remove-favorite-btn { background: none; border: none; color: #e74c3c; cursor: pointer; font-size: 0.9rem; margin-top: 0.5rem; padding: 0.25rem; }

/* =================================================================================
    Responsive Design for Mobile
====================================================================================
*/
@media (max-width: 600px) {
    .quote-container { padding: 1.5rem; }
    h1 { font-size: 1.25rem; }
    
    /* Stack all buttons vertically on small screens */
    .button-container {
        flex-direction: column;
        align-items: stretch; /* Make all buttons full width */
    }
    .secondary-buttons {
        width: 100%;
    }
}

