:root {
    /* Define base variables */
    --font-family: 'Outfit', sans-serif;
    
    /* Defaults for Light Mode */
    --bg-base: #f8f9fa;
    --bg-surface: rgba(255, 255, 255, 0.7);
    --bg-surface-hover: rgba(255, 255, 255, 0.9);
    --border-color: rgba(0, 0, 0, 0.08);
    --text-primary: #1a1e23;
    --text-secondary: #4a5568;
    --accent-primary: #3b82f6; /* Modern blue */
    --accent-secondary: #10b981; /* Emerald green */
    --gradient-1: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-glow: rgba(59, 130, 246, 0.2);
    --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.05);
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] {
    --bg-base: #0f1115; /* Deep rich dark */
    --bg-surface: rgba(25, 28, 35, 0.6);
    --bg-surface-hover: rgba(35, 39, 48, 0.8);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #4ade80; /* Vibrant green matching age calc */
    --accent-secondary: #3b82f6;
    --gradient-1: linear-gradient(135deg, #4ade80 0%, #3b82f6 100%);
    --gradient-glow: rgba(74, 222, 128, 0.15);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-base);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    transition: background-color 0.4s ease, color 0.4s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background Animated Blobs */
.blob-bg {
    position: fixed;
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    border-radius: 50%;
    background: radial-gradient(circle, var(--gradient-glow) 0%, transparent 70%);
    filter: blur(80px);
    z-index: -1;
    pointer-events: none;
    animation: drift 20s infinite alternate ease-in-out;
}

.blob-2 {
    top: auto;
    bottom: -10%;
    left: auto;
    right: -10%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
    animation: drift-reverse 25s infinite alternate ease-in-out;
}

[data-theme="dark"] .blob-2 {
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
}

@keyframes drift {
    0% { transform: translate(0, 0); }
    100% { transform: translate(10%, 10%); }
}
@keyframes drift-reverse {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-10%, -10%); }
}

/* Header & Navigation */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 2rem;
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--gradient-1);
    color: white;
    font-size: 1.1rem;
    box-shadow: 0 4px 15px var(--gradient-glow);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-1);
    border-radius: 2px;
}

.main-site-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 100px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary) !important;
    font-size: 0.9rem !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease !important;
}

.main-site-btn:hover {
    background-color: var(--text-primary);
    color: var(--bg-base) !important;
    transform: translateY(-2px);
}

.theme-toggle {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background-color: var(--bg-surface-hover);
    transform: rotate(15deg);
}

[data-theme="dark"] .dark-icon { display: none; }
[data-theme="dark"] .light-icon { display: block; }

[data-theme="light"] .light-icon { display: none; }
[data-theme="light"] .dark-icon { display: block; }

.menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 8rem 2rem 4rem;
    width: 100%;
}

/* Hero Section */
.hero-section {
    text-align: center;
    margin-bottom: 5rem;
    animation: fadeInDown 0.8s ease-out;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 100px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.author-attribution {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-top: -1rem;
    margin-bottom: 2rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem;
}

.search-container {
    max-width: 550px;
    margin: 0 auto;
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--bg-surface);
    border-radius: 100px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--glass-shadow);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(12px);
}

.search-container:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 8px 32px var(--gradient-glow);
    transform: translateY(-2px);
}

.search-icon-bg {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: all 0.3s ease;
    margin-left: 0.25rem;
}

.search-container:focus-within .search-icon-bg {
    color: var(--accent-primary);
    transform: scale(1.1);
}

.search-container input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 1rem 1rem 1rem 0.5rem;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1.05rem;
    min-width: 0;
}

.search-container input:focus {
    outline: none;
}

.search-container input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.search-btn {
    padding: 0.8rem 1.75rem;
    border-radius: 100px;
    background: var(--gradient-1);
    color: white;
    border: none;
    font-weight: 600;
    font-family: var(--font-family);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--gradient-glow);
    margin-right: 0.25rem;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--gradient-glow);
}

/* Apps Grid */
.section-heading {
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-heading h2 {
    font-size: 2rem;
    font-weight: 600;
}

.heading-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--border-color) 0%, transparent 100%);
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.app-card {
    position: relative;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 28px;
    padding: 2.5rem;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.app-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 2px;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    opacity: 0.5;
    transition: opacity 0.5s ease;
}

.app-card:hover {
    transform: translateY(-10px) scale(1.02);
    border-color: transparent;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.app-card:hover::before {
    background: var(--gradient-1);
    opacity: 1;
}

.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-1);
    opacity: 0;
    transition: opacity 0.5s ease;
    z-index: -1;
}

.app-card:hover .card-glow {
    opacity: 0.06;
}

.app-icon-wrapper {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    background: var(--bg-surface-hover);
    border: 1px solid var(--border-color);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.app-logo-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: inherit;
    transition: transform 0.5s ease;
}

.app-card:hover .app-icon-wrapper {
    transform: translateY(-6px) scale(1.05);
    border-color: var(--accent-primary);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.age-calc-icon { color: #10b981; }
[data-theme="dark"] .age-calc-icon { color: #4ade80; }
.utility-icon { color: #8b5cf6; }

.app-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.app-content h3 {
    font-size: 1.6rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.app-card:hover .app-content h3 {
    color: var(--accent-primary);
}

.app-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.05rem;
    line-height: 1.6;
    flex-grow: 1;
}

.app-tags {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.tag {
    font-size: 0.85rem;
    padding: 0.4rem 1.2rem;
    border-radius: 100px;
    background-color: var(--bg-surface-hover);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-weight: 600;
    transition: all 0.3s ease;
}

.app-card:hover .tag {
    background-color: var(--bg-base);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.app-link-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--text-secondary);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.app-link-indicator i {
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.app-card:hover .app-link-indicator {
    color: var(--accent-primary);
    gap: 0.85rem;
}

.app-card:hover .app-link-indicator i {
    transform: translateX(8px);
}

.app-card.disabled {
    opacity: 0.8;
    cursor: default;
}
.app-card.disabled:hover {
    transform: none;
    border-color: var(--border-color);
    box-shadow: var(--card-shadow);
}
.app-card.disabled:hover .app-icon-wrapper {
    transform: none;
}
.app-card.disabled .coming-soon {
    color: var(--text-secondary);
}

.no-results {
    text-align: center;
    padding: 4rem 2rem;
    background-color: var(--bg-surface);
    border-radius: 24px;
    border: 1px dashed var(--border-color);
}
.no-results i {
    font-size: 3rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    opacity: 0.5;
}
.no-results h3 {
    margin-bottom: 0.5rem;
}
.no-results p {
    color: var(--text-secondary);
}

/* FAQ Section */
.faq-section {
    margin-top: 6rem;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.faq-item:hover {
    border-color: var(--accent-primary);
}

.faq-item.active {
    border-color: var(--accent-primary);
    box-shadow: 0 4px 20px var(--gradient-glow);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: all 0.3s ease;
}

.faq-question i {
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
    color: var(--accent-primary);
}

.faq-answer {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s ease;
}

.faq-item.active .faq-answer {
    grid-template-rows: 1fr;
}

.faq-answer-inner {
    overflow: hidden;
}

.faq-answer-inner p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.app-footer {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 4rem 2rem 2rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto 3rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 3rem;
}

.footer-brand {
    max-width: 350px;
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links-container {
    display: flex;
    gap: 4rem;
    flex-wrap: wrap;
}

.footer-group h4 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.footer-group a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 0.75rem;
    transition: color 0.3s ease;
}

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

.footer-group i {
    width: 20px;
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .menu-btn {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: auto;
        background-color: var(--bg-surface-hover);
        backdrop-filter: blur(35px) saturate(180%);
        -webkit-backdrop-filter: blur(35px) saturate(180%);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        padding: 6rem 2rem 2.5rem;
        border-bottom: 1px solid var(--border-color);
        border-radius: 0 0 32px 32px;
        gap: 1.5rem;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
        transform: translateY(-100%);
        transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        display: flex;
        z-index: -1;
    }
    
    .nav-links.active {
        transform: translateY(0);
    }

    .hero-title {
        font-size: 2.5rem;
    }
    
    .main-content {
        padding-top: 6rem;
    }

    .apps-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }
}