:root {
    --navy-base: #0a192f;
    --electric-blue: #64ffda;
    --light-slate: #ccd6f6;
    --slate: #8892b0;
    --white: #e6f1ff;
    --background-light: #f0f4f8;
    --text-light: #1e2a3a;
    --card-bg-light: rgba(255, 255, 255, 0.6);
    --shadow-light: rgba(0, 0, 0, 0.1);
    --background-dark: var(--navy-base);
    --text-dark: var(--light-slate);
    --card-bg-dark: rgba(30, 42, 58, 0.6);
    --shadow-dark: rgba(0, 0, 0, 0.4);
    --font-sans: 'Inter', sans-serif;
    --transition-speed: 0.3s;
}

[data-theme='dark'] {
    --background: var(--background-dark);
    --text-primary: var(--text-dark);
    --text-secondary: var(--slate);
    --card-bg: var(--card-bg-dark);
    --card-shadow: 0 8px 32px 0 var(--shadow-dark);
    --button-bg: transparent;
    --button-text: var(--electric-blue);
    --button-border: var(--electric-blue);
    --button-hover-bg: rgba(100, 255, 218, 0.1);
    --logo-text: var(--white);
    --hamburger-color: var(--light-slate);
}

[data-theme='light'] {
    --background: var(--background-light);
    --text-primary: var(--text-light);
    --text-secondary: #5a677d;
    --card-bg: var(--card-bg-light);
    --card-shadow: 0 8px 20px 0 var(--shadow-light);
    --button-bg: var(--navy-base);
    --button-text: var(--white);
    --button-border: var(--navy-base);
    --button-hover-bg: #1e2a3a;
    --logo-text: var(--navy-base);
    --hamburger-color: var(--navy-base);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--background);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Header & Nav */
.main-header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 1rem 5%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--logo-text);
}

.logo svg path {
    stroke: var(--logo-text);
}

.logo span {
    margin-left: 0.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-speed);
}

.nav-links a:hover {
    color: var(--electric-blue);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 2rem;
    min-height: 50vh;
    background: linear-gradient(135deg, rgba(10, 25, 47, 0.8), rgba(10, 25, 47, 0.9)), url('https://images.unsplash.com/photo-1611117775350-ac395092d204?q=80&w=2070&auto=format&fit=crop') center/cover no-repeat;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    color: var(--white);
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--light-slate);
    max-width: 600px;
    margin: 1rem auto 0;
}

/* Offer Sections */
.offer-section {
    padding: 4rem 2rem;
    display: flex;
    justify-content: center;
}

.offer-card {
    width: 100%;
    max-width: 500px;
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2.5rem;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.offer-card:hover {
    transform: translateY(-10px);
}

.offer-icon {
    margin-bottom: 1.5rem;
}

.offer-icon svg {
    width: 48px;
    height: 48px;
    color: var(--electric-blue);
}

.offer-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.offer-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* CTA Button */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border: 1px solid var(--button-border);
    background-color: var(--button-bg);
    color: var(--button-text);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-speed) ease;
    gap: 0.5rem;
}

.cta-button:hover {
    background-color: var(--button-hover-bg);
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.cta-button svg {
    transition: transform var(--transition-speed) ease;
}

.cta-button:hover svg {
    transform: translateX(5px);
}

/* Theme Toggle */
.theme-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

.theme-switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--electric-blue);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

/* Footer */
.main-footer-credit {
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
    color: var(--slate);
}

/* Hamburger Menu */
.hamburger {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger rect {
    fill: var(--hamburger-color);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--card-bg);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 1rem 0;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        text-align: center;
        padding: 1rem 0;
    }

    .hamburger {
        display: block;
    }

    .hero {
        min-height: 40vh;
    }

    .offer-section {
        padding: 3rem 1rem;
    }

    .offer-card {
        padding: 2rem;
    }
}

/* Pricing Section */
.pricing-section {
    padding: 4rem 2rem;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.pricing-card:hover {
    transform: translateY(-10px);
}

.pricing-card.featured {
    border-color: var(--electric-blue);
    transform: scale(1.05);
}

.featured-badge {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--electric-blue);
    color: var(--navy-base);
    padding: 0.5rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 700;
    transform: rotate(45deg) translate(3.5rem, -1rem);
    width: 12rem;
    text-align: center;
}

.pricing-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.pricing-header .price {
    font-size: 3rem;
    font-weight: 900;
    color: var(--text-primary);
    margin: 0.5rem 0;
}

.pricing-header .price span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.billing-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.pricing-body {
    flex-grow: 1;
}

.pricing-body p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.features-list {
    list-style: none;
    padding-left: 0;
    text-align: left;
}

.features-list li {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}

.features-list li::before {
    content: '✓';
    color: var(--electric-blue);
    font-weight: bold;
    margin-right: 0.5rem;
}

.pricing-footer {
    margin-top: 2rem;
}

@media (max-width: 992px) {
    .pricing-card.featured {
        transform: scale(1);
    }
}

@media (max-width: 768px) {
    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .cta-button {
        flex-direction: column;
        padding: 1rem;
    }

    .cta-button .arrow-icon {
        display: none;
    }
}

/* Content Sections (About, How-to, etc) */
.content-section {
    padding: 4rem 2rem;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.how-to-list {
    list-style: none;
    counter-reset: how-to-counter;
    padding-left: 0;
    text-align: left;
    max-width: 600px;
    margin: 2rem auto 0;
}

.how-to-list li {
    counter-increment: how-to-counter;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    font-size: 1.1rem;
}

.how-to-list li::before {
    content: counter(how-to-counter);
    background-color: var(--electric-blue);
    color: var(--navy-base);
    font-weight: 700;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-right: 1rem;
}

/* FAQ Section */
.faq-container {
    max-width: 700px;
    margin: 0 auto;
    text-align: left;
}

.faq-item {
    background: var(--card-bg);
    border-radius: 10px;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    transition: border-color var(--transition-speed);
}

.faq-item.active {
    border-color: var(--electric-blue);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    font-size: 1.1rem;
}

.faq-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-speed);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-out, padding 0.5s ease-out;
    padding: 0 1.5rem;
}

.faq-answer p {
    color: var(--text-secondary);
    padding-bottom: 1.5rem;
}

/* Footer / Disclosure */
.footer-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Sticky Banner */
.sticky-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    z-index: 1000;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.1);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.5s ease-in-out;
    transform: translateY(100%); /* Hidden by default */
}

.sticky-banner.visible {
    transform: translateY(0); /* Shown when class is added */
}

.banner-text {
    color: var(--text-primary);
    font-weight: 500;
}

.banner-cta {
    flex-shrink: 0; /* Prevent button from shrinking */
}

.close-button {
    position: absolute;
    top: 50%;
    right: 1.5rem;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.5rem;
}

@media (max-width: 768px) {
    .sticky-banner {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
        padding-bottom: 1.5rem;
    }
    .close-button {
        top: 0.5rem;
        right: 0.5rem;
        transform: none;
    }
}