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

:root {
    --primary-color: #0077cc;
    --primary-dark: #005fa3;
    --secondary-color: #ffcc00;
    --secondary-dark: #e6b800;
    --gradient-1: #6a11cb;
    --gradient-2: #2575fc;
    --text-primary: #333;
    --text-secondary: #666;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --border-radius: 10px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.8;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background-image: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    color: white;
    padding: 60px 20px;
    text-align: center;
    box-shadow: var(--shadow-md);
    position: relative;
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
}

.header-top {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 10px;
}

header h1 {
    margin: 0;
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -2px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

header p {
    margin: 10px 0 0;
    font-size: 1.3rem;
    opacity: 0.95;
    font-weight: 400;
}

.under-development {
    margin-top: 20px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary-color);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Theme Toggle */
.theme-toggle {
    background-color: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 10px 16px;
    border-radius: 50px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.moon-icon {
    display: none;
}

body.dark-mode .sun-icon {
    display: none;
}

body.dark-mode .moon-icon {
    display: inline;
}

/* Auth Buttons */
.auth-buttons {
    margin-top: 25px;
    display: flex;
    justify-content: center;
    gap: 15px;
}

.auth-buttons button {
    background-color: var(--secondary-color);
    color: var(--text-primary);
    border: none;
    padding: 12px 30px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.auth-buttons button:hover {
    background-color: var(--secondary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Search Bar */
.search-bar {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

#search-input {
    padding: 14px 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px 0 0 50px;
    width: 100%;
    font-size: 1rem;
    background-color: rgba(255, 255, 255, 0.95);
    transition: var(--transition);
    outline: none;
}

#search-input:focus {
    border-color: rgba(255, 255, 255, 0.6);
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.1);
}

#search-btn {
    padding: 14px 30px;
    background-color: var(--secondary-color);
    color: var(--text-primary);
    border: 2px solid var(--secondary-color);
    border-radius: 0 50px 50px 0;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

#search-btn:hover {
    background-color: var(--secondary-dark);
    border-color: var(--secondary-dark);
    transform: translateX(2px);
}

/* Ask Question Button */
.ask-question {
    text-align: right;
    margin-bottom: 30px;
}

#ask-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

#ask-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.filter-tab {
    background-color: var(--bg-white);
    border: 2px solid #e0e0e0;
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-tab.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Questions Section */
#questions {
    margin-top: 40px;
}

#questions h2 {
    font-size: 2.2rem;
    margin-bottom: 25px;
    color: var(--primary-color);
    font-weight: 700;
}

#question-list {
    list-style-type: none;
    padding: 0;
}

#question-list li {
    background-color: var(--bg-white);
    margin-bottom: 20px;
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border-left: 4px solid transparent;
}

#question-list li:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--primary-color);
}

.question-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.question-title:hover {
    color: var(--primary-dark);
}

.question-author {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.question-author span {
    font-weight: 600;
    color: var(--text-primary);
}

.answer {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 18px;
    border-radius: 8px;
    margin-top: 15px;
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.answer:hover {
    background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);
}

.answer-author {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.answer-author span {
    font-weight: 600;
    color: var(--primary-color);
}

.answer-text {
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.7;
}

/* Top Contributors Section */
#top-contributors {
    margin-top: 50px;
}

#top-contributors h2 {
    font-size: 2.2rem;
    margin-bottom: 25px;
    color: var(--primary-color);
    font-weight: 700;
}

#contributor-list {
    list-style-type: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

#contributor-list li {
    background: linear-gradient(135deg, var(--bg-white) 0%, #f8f9fa 100%);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

#contributor-list li:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.contributor-name {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.contributor-score {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Footer */
footer {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 30px 20px;
    text-align: center;
    margin-top: 60px;
    box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.1);
}

footer p {
    margin: 8px 0;
    font-size: 1rem;
}

footer strong {
    font-weight: 700;
}

.footer-links {
    margin-top: 15px;
}

.footer-links a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
    opacity: 0.9;
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-white);
    padding: 40px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease;
    max-width: 500px;
    position: relative;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.modal-content h2 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.8rem;
}

.modal-content p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    line-height: 1;
}

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

/* Dark Mode */
body.dark-mode {
    --bg-light: #1a1a1a;
    --bg-white: #2d2d2d;
    --text-primary: #f4f4f9;
    --text-secondary: #bbb;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
}

body.dark-mode header {
    background-image: linear-gradient(135deg, #004080, #0066cc);
}

body.dark-mode footer {
    background: linear-gradient(135deg, #004080, #003060);
}

body.dark-mode .answer {
    background: linear-gradient(135deg, #3d3d3d 0%, #2d2d2d 100%);
}

body.dark-mode .answer:hover {
    background: linear-gradient(135deg, #4d4d4d 0%, #3d3d3d 100%);
}

body.dark-mode .question-title,
body.dark-mode .contributor-name,
body.dark-mode #questions h2,
body.dark-mode #top-contributors h2 {
    color: #00aaff;
}

body.dark-mode .answer-author span {
    color: #00aaff;
}

body.dark-mode #search-input {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

body.dark-mode #search-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

body.dark-mode .filter-tab {
    background-color: var(--bg-white);
    border-color: #444;
    color: var(--text-primary);
}

body.dark-mode #contributor-list li {
    background: linear-gradient(135deg, var(--bg-white) 0%, #252525 100%);
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2.5rem;
    }

    header p {
        font-size: 1.1rem;
    }

    .header-top {
        flex-direction: column;
        gap: 15px;
    }

    .search-bar {
        flex-direction: column;
        gap: 10px;
    }

    #search-input,
    #search-btn {
        border-radius: 50px;
        width: 100%;
        justify-content: center;
    }

    #questions h2,
    #top-contributors h2 {
        font-size: 1.8rem;
    }

    .question-title {
        font-size: 1.3rem;
    }

    .auth-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .auth-buttons button,
    #ask-btn {
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
    }

    .filter-tabs {
        justify-content: center;
    }

    #contributor-list {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }

    .container {
        padding: 15px;
    }

    #question-list li {
        padding: 20px;
    }

    .modal-content {
        padding: 30px 20px;
        margin: 20px;
    }
}