/* ========================================
   AiLydian Knowledge Base - Professional Stylesheet
   Version: 2.1 Sardag Edition
   Design: Matches Homepage with Glassmorphism & Modern UI
   ======================================== */

/* ========== CSS Variables ========== */
:root {
    /* Colors */
    --primary: #10A37F;
    --primary-hover: #0D8F6E;
    --primary-light: rgba(16, 163, 127, 0.1);
    --accent: #FF6B4A;
    --accent-hover: #E5593A;

    /* Neutrals */
    --white: #FFFFFF;
    --black: #000000;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #10A37F 0%, #0D8F6E 100%);
    --gradient-hero: linear-gradient(135deg, rgba(16, 163, 127, 0.2) 0%, rgba(255, 107, 74, 0.2) 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.7) 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -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);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========== Navigation ========== */
.navbar {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    width: calc(100% - 40px);
    max-width: 1200px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-normal);
}

.navbar-logo:hover {
    color: var(--primary-hover);
    transform: translateY(-2px);
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.navbar-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    color: var(--gray-700);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-normal);
}

.navbar-item:hover {
    background: var(--primary-light);
    color: var(--primary);
    transform: translateY(-2px);
}

.navbar-item.active {
    background: var(--primary);
    color: var(--white);
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

/* ========== Hero Section ========== */
.knowledge-hero {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px var(--spacing-md) 80px;
    overflow: hidden;
}

.knowledge-hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: var(--gradient-hero);
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.6;
    animation: heroFloat 8s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-30px); }
}

.hero-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(16, 163, 127, 0.15) 1px, transparent 1px),
        radial-gradient(circle at 80% 70%, rgba(255, 107, 74, 0.15) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: particlesMove 20s linear infinite;
}

@keyframes particlesMove {
    0% { background-position: 0 0; }
    100% { background-position: 50px 50px; }
}

.knowledge-hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 1000px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    border: 1px solid rgba(16, 163, 127, 0.2);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    animation: dotBlink 1.5s ease-in-out infinite;
}

@keyframes dotBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-title i {
    color: var(--primary);
    font-size: 3.5rem;
}

.hero-title-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(16, 163, 127, 0.1);
    transition: var(--transition-normal);
    min-width: 120px;
}

.hero-stat:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.hero-stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.2;
}

.hero-stat-label {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-top: 0.25rem;
}

/* ========== Search Container ========== */
.search-container {
    max-width: 800px;
    margin: 0 auto;
}

.search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 2px solid transparent;
    transition: var(--transition-normal);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(16, 163, 127, 0.1), var(--shadow-xl);
}

.search-icon {
    font-size: 1.5rem;
    color: var(--gray-400);
    margin-left: 0.5rem;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1.1rem;
    color: var(--gray-900);
    padding: 0.75rem;
}

.search-input::placeholder {
    color: var(--gray-400);
}

.voice-search-btn {
    padding: 0.75rem;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-md);
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition-normal);
    font-size: 1.25rem;
}

.voice-search-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.voice-search-btn.recording {
    background: var(--accent);
    color: var(--white);
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.search-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-normal);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ========== Search Filters ========== */
.search-filters {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.filter-select {
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-normal);
    outline: none;
}

.filter-select:hover,
.filter-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

.advanced-filter-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
}

.advanced-filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

/* ========== Categories Section ========== */
.knowledge-categories {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.section-title i {
    color: var(--primary);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray-600);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.category-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.category-card:hover::before {
    transform: scaleX(1);
}

.category-icon {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    transition: var(--transition-normal);
}

.category-card:hover .category-icon {
    transform: scale(1.1) rotate(5deg);
}

/* Category Icon Colors */
.agriculture-icon {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    color: var(--white);
}

.space-icon {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color: var(--white);
}

.medicine-icon {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: var(--white);
}

.climate-icon {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    color: var(--white);
}

.technology-icon {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: var(--white);
}

.science-icon {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: var(--white);
}

.education-icon {
    background: linear-gradient(135deg, #ec4899 0%, #db2777 100%);
    color: var(--white);
}

.business-icon {
    background: linear-gradient(135deg, #14b8a6 0%, #0d9488 100%);
    color: var(--white);
}

.law-icon {
    background: linear-gradient(135deg, #64748b 0%, #475569 100%);
    color: var(--white);
}

.category-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.category-description {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.category-stats {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
}

.category-count {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}

.category-sources {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.category-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem;
    background: var(--primary-light);
    color: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.category-btn:hover {
    background: var(--primary);
    color: var(--white);
}

.view-all-categories {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.view-all-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: var(--radius-xl);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.view-all-btn:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Category Professions */
.category-professions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.profession-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    background: var(--gray-100);
    color: var(--gray-700);
    border-radius: var(--radius-full);
    white-space: nowrap;
    transition: var(--transition-normal);
}

.profession-tag:hover {
    background: var(--primary-light);
    color: var(--primary);
}

/* ========== Search Results Section ========== */
.search-results-section {
    padding: 80px 0;
    background: var(--white);
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.results-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
}

.results-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 0.95rem;
    color: var(--gray-600);
}

.results-time {
    padding: 0.5rem 1rem;
    background: var(--gray-100);
    border-radius: var(--radius-md);
}

.results-grid {
    display: grid;
    gap: var(--spacing-lg);
}

/* ========== AI Assistant Section ========== */
.ai-assistant-section {
    padding: 80px 0;
    background: var(--gradient-hero);
}

.ai-assistant-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.ai-assistant-icon {
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--white);
    flex-shrink: 0;
}

.ai-assistant-content {
    flex: 1;
}

.ai-assistant-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.ai-assistant-description {
    font-size: 1.1rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.ai-assistant-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.ai-assistant-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ========== Data Sources Section ========== */
.data-sources-section {
    padding: 80px 0;
}

.sources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.source-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: var(--transition-normal);
}

.source-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.source-logo {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary);
}

.source-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.source-stats {
    font-size: 0.9rem;
    color: var(--gray-600);
}

/* ========== Footer ========== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.footer-title i {
    color: var(--primary);
}

.footer-description {
    font-size: 0.95rem;
    line-height: 1.6;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition-normal);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-800);
    font-size: 0.9rem;
}

.footer-version {
    margin-top: 0.5rem;
    color: var(--gray-600);
}

/* ========== Loading Overlay ========== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-normal);
}

.loading-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.loading-spinner {
    text-align: center;
    color: var(--white);
}

.loading-spinner i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
}

.loading-spinner p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* ========== Responsive Design ========== */
@media (max-width: 768px) {
    .navbar {
        width: calc(100% - 20px);
        top: 10px;
    }

    .navbar-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        border-radius: var(--radius-lg);
        margin-top: 10px;
        padding: var(--spacing-sm);
        flex-direction: column;
        box-shadow: var(--shadow-lg);
    }

    .navbar-menu.active {
        display: flex;
    }

    .navbar-toggle {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-title i {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-stats {
        gap: var(--spacing-sm);
    }

    .hero-stat {
        min-width: 100px;
        padding: var(--spacing-sm);
    }

    .search-box {
        flex-wrap: wrap;
    }

    .search-input {
        width: 100%;
        min-width: 0;
    }

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

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .ai-assistant-card {
        flex-direction: column;
        text-align: center;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
        flex-direction: column;
    }

    .hero-stats {
        flex-direction: column;
        width: 100%;
    }

    .hero-stat {
        width: 100%;
    }

    .search-filters {
        flex-direction: column;
        width: 100%;
    }

    .filter-select,
    .advanced-filter-btn {
        width: 100%;
    }
}