/* Futuristic Theme - Everlasting Intelligence */

:root {
    --primary-bg: #0a0a0f;
    --secondary-bg: #1a1a2e;
    --card-bg: #16213e;
    --accent-cyan: #00d9ff;
    --accent-purple: #a855f7;
    --accent-pink: #ec4899;
    --text-primary: #ffffff;
    --text-secondary: #b0b0c0;
    --glow-cyan: rgba(0, 217, 255, 0.5);
    --glow-purple: rgba(168, 85, 247, 0.5);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Animated background particles effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(168, 85, 247, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 217, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
    z-index: -1;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

/* Navigation */
nav {
    background: rgba(26, 26, 46, 0.8);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--accent-cyan);
    box-shadow: 0 4px 30px rgba(0, 217, 255, 0.2);
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    align-items: center;
}

nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

nav a:hover {
    color: var(--accent-cyan);
    background: rgba(0, 217, 255, 0.1);
    box-shadow: 0 0 20px var(--glow-cyan);
    transform: translateY(-2px);
}

nav a.logo {
    font-size: 1.4rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Hamburger Menu Button */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
    background: transparent;
    border: none;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--accent-cyan);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 3px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Logo */
.mobile-logo {
    display: none;
    font-size: 1.2rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}


/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInDown 1s ease;
}

.hero p {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 2rem;
    animation: fadeInUp 1s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    margin: 0.5rem;
    border: 2px solid var(--accent-cyan);
    background: transparent;
    color: var(--accent-cyan);
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: var(--accent-cyan);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
    z-index: -1;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    color: var(--primary-bg);
    box-shadow: 0 0 30px var(--glow-cyan);
    transform: translateY(-3px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border: none;
    color: white;
}

.btn-primary::before {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 2rem;
    border: 1px solid rgba(0, 217, 255, 0.2);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(168, 85, 247, 0.1));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 40px var(--glow-cyan);
    border-color: var(--accent-cyan);
}

.card:hover::before {
    opacity: 1;
}

/* Scroll-based highlighting for mobile */
.card.in-view {
    transform: translateY(-10px);
    box-shadow: 0 10px 40px var(--glow-cyan);
    border-color: var(--accent-cyan);
}

.card.in-view::before {
    opacity: 1;
}

.card h3 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    position: relative;
    z-index: 1;
}

.card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    position: relative;
    z-index: 1;
}

/* Clickable Cards */
.card-clickable {
    cursor: pointer;
    user-select: none;
}

/* Section Titles */
.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin: 3rem 0 2rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Tool specific styles */
.tool-container {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--card-bg);
    border-radius: 15px;
    padding: 2rem;
    border: 1px solid rgba(0, 217, 255, 0.2);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--accent-cyan);
    font-weight: 500;
}

input[type="number"],
input[type="text"],
select,
textarea {
    width: 100%;
    padding: 0.8rem;
    background: var(--secondary-bg);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px var(--glow-cyan);
}

/* Results display */
.result {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(0, 217, 255, 0.05);
    border-radius: 10px;
    border: 1px solid var(--accent-cyan);
    text-align: center;
}

.result.mismatch {
    border-color: #ff4c4c;
    background: rgba(255, 76, 76, 0.05);
}

.result.no-mismatch {
    border-color: #4caf50;
    background: rgba(76, 175, 80, 0.05);
}

/* YouTube Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.video-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid rgba(0, 217, 255, 0.2);
    transition: all 0.3s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--glow-cyan);
}

.video-thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--secondary-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--accent-cyan);
}

.video-embed {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--secondary-bg);
    position: relative;
    overflow: hidden;
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-info {
    padding: 1.5rem;
}

.video-info h3 {
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
}

.video-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Knowledge/Blog Posts */
.post {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(0, 217, 255, 0.2);
    transition: all 0.3s ease;
}

.post:hover {
    border-color: var(--accent-cyan);
    box-shadow: 0 5px 20px var(--glow-cyan);
}

.post h2 {
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
}

.post-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.post-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
    border-top: 1px solid rgba(0, 217, 255, 0.2);
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    /* Disable hover effects on mobile - use scroll-based highlighting instead */
    .card:hover {
        transform: none;
        box-shadow: none;
        border-color: rgba(0, 217, 255, 0.2);
    }

    .card:hover::before {
        opacity: 0;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    /* Mobile Navigation */
    nav {
        padding: 1rem;
    }

    nav ul {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(26, 26, 46, 0.98);
        backdrop-filter: blur(10px);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        padding: 0;
        box-shadow: 0 4px 30px rgba(0, 217, 255, 0.2);
    }

    nav ul.active {
        max-height: 400px;
        padding: 1rem 0;
    }

    nav ul li {
        width: 100%;
        text-align: center;
        border-bottom: 1px solid rgba(0, 217, 255, 0.1);
    }

    nav ul li:last-child {
        border-bottom: none;
    }

    nav ul li a {
        display: block;
        padding: 1rem;
        width: 100%;
    }

    /* Show hamburger on mobile */
    .hamburger {
        display: flex;
        position: absolute;
        right: 1rem;
        top: 50%;
        transform: translateY(-50%);
    }

    /* Keep logo visible and positioned */
    nav ul li:first-child {
        display: none; /* Hide logo from menu list */
    }

    nav .mobile-logo {
        display: block;
    }

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

    .container {
        padding: 1rem;
    }
}

/* Loading animation for images/content */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0, 217, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-cyan);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Utility classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }