:root {
    /* M3 Light Theme Colors */
    --primary-light: #445E91;
    --on-primary-light: #FFFFFF;
    --primary-container-light: #D8E2FF;
    --on-primary-container-light: #2B4678;
    --secondary-light: #575E71;
    --on-secondary-light: #FFFFFF;
    --tertiary-light: #006A63;
    --on-tertiary-light: #FFFFFF;
    
    --bg-light: #F9F9FF;
    --on-bg-light: #1A1B20;
    --surface-light: #F9F9FF;
    --on-surface-light: #1A1B20;
    --surface-variant-light: #E1E2EC;
    --on-surface-variant-light: #44474F;
    --outline-light: #74777F;
    --outline-variant-light: #C4C6D0;
    --surface-container-light: #EDEDF4;
    --surface-container-highest-light: #E2E2E9;

    /* M3 Dark Theme Colors */
    --primary-dark: #ADC6FF;
    --on-primary-dark: #102F60;
    --primary-container-dark: #2B4678;
    --on-primary-container-dark: #D8E2FF;
    --secondary-dark: #BFC6DC;
    --on-secondary-dark: #293041;
    --tertiary-dark: #81D5CC;
    --on-tertiary-dark: #003733;

    --bg-dark: #111318;
    --on-bg-dark: #E2E2E9;
    --surface-dark: #111318;
    --on-surface-dark: #E2E2E9;
    --surface-variant-dark: #44474F;
    --on-surface-variant-dark: #C4C6D0;
    --outline-dark: #8E9099;
    --surface-container-dark: #1E1F25;
    --surface-container-high-dark: #282A2F;
    --outline-variant-dark: #44474F;

    /* Variables for active theme (Light by default for body) */
    --bg-main: var(--bg-light);
    --text-main: var(--on-bg-light);
    --text-muted: var(--on-surface-variant-light);
    --surface: var(--surface-light);
    --surface-card: var(--surface-container-lowest-light, #FFFFFF);
    --border-color: var(--outline-variant-light);
    --btn-primary-bg: var(--primary-light);
    --btn-primary-text: var(--on-primary-light);
    --icon-color: var(--primary-light);

    /* Dimensions & Fonts */
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

h1, h2, h3, h4, .logo {
    font-family: 'Outfit', sans-serif;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.text-center { text-align: center; }

/* Hybrid Structure Classes */
.theme-dark {
    background-color: var(--bg-dark);
    color: var(--on-bg-dark);
    --text-main: var(--on-bg-dark);
    --text-muted: var(--on-surface-variant-dark);
    --surface: var(--surface-dark);
    --surface-card: var(--surface-container-dark);
    --border-color: var(--outline-variant-dark);
    /* For high contrast on dark bg, button uses dark theme primary (light blue) */
    --btn-primary-bg: var(--primary-dark);
    --btn-primary-text: var(--on-primary-dark);
    --icon-color: var(--primary-dark);
}

.theme-privacy {
    background-color: var(--surface-container-high-dark);
    color: var(--on-bg-dark);
}

/* Base Components */
.card-light {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
    transition: var(--transition);
}

.card-light:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
    border-color: var(--outline-light);
}

.gradient-text-dark {
    background: linear-gradient(135deg, var(--tertiary-dark), var(--primary-dark));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 100px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: 'Inter', sans-serif;
}

.btn-primary {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    box-shadow: 0 4px 12px rgba(68, 94, 145, 0.2);
}

.theme-dark .btn-primary {
    box-shadow: 0 4px 15px rgba(173, 198, 255, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
    box-shadow: 0 6px 20px rgba(68, 94, 145, 0.3);
}

.theme-dark .btn-primary:hover {
    box-shadow: 0 6px 20px rgba(173, 198, 255, 0.3);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.1rem;
}

/* Navbar (Dark) */
.navbar {
    padding: 24px 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: rgba(17, 19, 24, 0.85); /* bg-dark with opacity */
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--outline-variant-dark);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--on-bg-dark);
}

.logo-icon {
    color: var(--tertiary-dark);
}

/* Hero Section (Dark) */
.hero {
    display: flex;
    align-items: center;
    min-height: 100vh;
    padding-top: 100px;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--surface-variant-dark);
    border: 1px solid var(--outline-dark);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--tertiary-dark);
    margin-bottom: 24px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.hero-title {
    font-size: 4.5rem;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1.5px;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 500px;
}

.sub-cta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 12px;
    text-align: center;
    width: max-content;
}

/* Glow on Dark Section */
.glow-blob {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(68, 94, 145, 0.25) 0%, rgba(17,19,24,0) 70%);
    top: -100px;
    left: -200px;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 0;
    pointer-events: none;
}
.hero-content, .hero-mockup {
    z-index: 1;
    position: relative;
}

/* Mockups */
.hero-mockup {
    flex: 1;
    display: flex;
    justify-content: center;
    perspective: 1000px;
}

.phone-frame {
    width: 320px;
    height: 650px;
    background: #000;
    border-radius: 40px;
    border: 8px solid #282A2F;
    box-shadow: 0 35px 60px rgba(0,0,0,0.6), inset 0 0 0 2px #444;
    position: relative;
    overflow: hidden;
    transform: rotateY(-15deg) rotateX(5deg);
    transition: transform 0.5s ease;
}

.phone-frame:hover {
    transform: rotateY(-5deg) rotateX(2deg);
}

.phone-notch {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 25px;
    background: #282A2F;
    border-bottom-left-radius: 16px;
    border-bottom-right-radius: 16px;
    z-index: 10;
}

.phone-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Privacy Block (Dark) */
.privacy-wrapper {
    padding: 100px 0;
}

.privacy-card {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 60px 40px;
    background: var(--surface-container-high-dark);
    border: 1px solid var(--outline-variant-dark);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.icon-wrapper-privacy {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--primary-container-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--on-primary-container-dark);
}

.privacy-card h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--on-surface-dark);
}

.privacy-card p {
    color: var(--on-surface-variant-dark);
    font-size: 1.1rem;
    max-width: 600px;
}

/* Features Grid (Light) */
.features {
    padding: 120px 0;
    background-color: var(--bg-light);
}

.section-header {
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 3rem;
    margin-bottom: 16px;
    color: var(--on-surface-light);
}

.section-header p {
    color: var(--on-surface-variant-light);
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.feature-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    padding: 0;
}

.feature-card .feature-text {
    padding: 32px;
    flex-grow: 1;
}

.feature-text h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--on-surface-light);
}

.feature-text p {
    color: var(--on-surface-variant-light);
}

.feature-icon {
    position: absolute;
    top: 32px;
    right: 32px;
    color: var(--primary-light);
    background: var(--surface-light);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    z-index: 2;
}

/* Images in light mode pop more when they have dark content */
.feature-img-mock {
    width: 100%;
    height: 250px;
    object-fit: cover;
    object-position: top;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover .feature-img-mock {
    transform: scale(1.03);
}

/* FAQ Accordion (Light) */
.faq-wrapper {
    padding: 100px 0;
    background-color: var(--surface-container-light);
}

.faq {
    max-width: 800px;
    margin: 0 auto;
}

.accordion {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.accordion-item {
    background: #FFFFFF;
    border: 1px solid var(--outline-variant-light);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.accordion-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 32px;
    background: transparent;
    border: none;
    color: var(--on-surface-light);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
}

.accordion-icon {
    transition: var(--transition);
    color: var(--primary-light);
}

.accordion-header[aria-expanded="true"] .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.accordion-content p {
    padding: 0 32px 32px;
    color: var(--on-surface-variant-light);
    line-height: 1.7;
}

.accordion-item.active {
    border-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(68, 94, 145, 0.08);
}

/* Footer (Dark) */
.footer {
    padding: 80px 0 40px;
    position: relative;
    overflow: hidden;
}

.footer-cta {
    margin-bottom: 60px;
}

.closing-phrase {
    font-size: 1.8rem;
    margin-bottom: 40px;
    background: linear-gradient(to right, #FFFFFF, var(--primary-dark));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 992px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 140px;
    }
    .hero-title {
        font-size: 3.5rem;
    }
    .hero-description {
        margin: 0 auto 40px;
    }
    .hero-mockup {
        perspective: none;
    }
    .phone-frame {
        transform: none;
    }
    .phone-frame:hover {
        transform: translateY(-10px);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.8rem;
    }
    .privacy-card h2, .section-header h2 {
        font-size: 2.2rem;
    }
    .closing-phrase {
        font-size: 1.4rem;
    }
}

.logo-img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}
.logo {
    text-decoration: none;
    transition: opacity 0.2s;
}
.logo:hover {
    opacity: 0.8;
}
.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}
.nav-links a {
    color: var(--on-bg-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a:hover {
    color: var(--primary-dark);
}
.icon-btn {
    background: transparent;
    border: none;
    color: var(--on-bg-dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s;
}
.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-right {
    display: flex;
    align-items: center;
}

/* Language Switcher in Nav */
.lang-switcher-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 16px;
    padding-left: 16px;
    border-left: 1px solid rgba(255,255,255,0.2);
}
.lang-switcher-nav a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    color: var(--on-bg-dark);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}
.lang-switcher-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--on-bg-dark);
}
.lang-switcher-nav a.active {
    background: rgba(173, 198, 255, 0.15);
    border-color: var(--primary-dark);
    color: var(--primary-dark);
}
.lang-switcher-nav .fi {
    border-radius: 50%;
    font-size: 1.1rem;
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* Hide links on very small screens to prevent overflow */
    }
    .lang-switcher-nav {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
    }
}