:root {
    /* M3 Official Purple Palette */
    --primary: #6750A4;
    --on-primary: #FFFFFF;
    --primary-container: #EADDFF;
    --on-primary-container: #21005E;

    --secondary: #625B71;
    --on-secondary: #FFFFFF;

    --surface: #FEF7FF;
    --on-surface: #1D1B20;
    --surface-variant: #E7E0EB;
    --on-surface-variant: #49454F;

    --background: #FFFFFF;
    --on-background: #1D1B20;

    --outline: #79747E;

    --container-padding: 1.5rem;
    --max-width: 1200px;

    --font-main: 'Nunito', sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary: #D0BCFF;
        --on-primary: #381E72;
        --primary-container: #4F378B;
        --on-primary-container: #EADDFF;

        --surface: #141218;
        --on-surface: #E6E1E5;
        --surface-variant: #49454F;
        --on-surface-variant: #CAC4D0;

        --background: #0F172A;
        /* App Slate Background */
        --on-background: #E6E1E5;
    }
}

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

body {
    font-family: var(--font-main);
    background-color: var(--background);
    color: var(--on-background);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
span {
    font-family: var(--font-main);
}

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

/* Typography */
h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.highlight {
    background: linear-gradient(120deg, var(--primary), #AF52DE);
    background-clip: text;
    /* Fixed compatibility */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    padding-top: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--container-padding);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
    font-family: 'Outfit';
}

.logo img {
    height: 40px;
    width: auto;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--on-surface-variant);
    font-weight: 600;
    transition: color 0.3s;
}

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

.hero-content {
    text-align: center;
    padding: 6rem 0 4rem;
    max-width: 800px;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--on-surface-variant);
    margin-bottom: 2.5rem;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Buttons */
.btn {
    padding: 0.8rem 2rem;
    border-radius: 100px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, background-color 0.3s, box-shadow 0.3s;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--on-primary);
    box-shadow: 0 4px 12px rgba(103, 80, 164, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(103, 80, 164, 0.4);
}

.btn-secondary {
    background-color: var(--primary-container);
    color: var(--on-primary-container);
}

.btn-text {
    color: var(--primary);
}

/* Hero Visual */
.hero-visual {
    width: 100%;
    display: flex;
    justify-content: center;
    padding-bottom: 4rem;
}

.phone-mockup {
    max-width: 300px;
    width: 90%;
    background: var(--surface-variant);
    border-radius: 40px;
    padding: 10px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border: 8px solid #1D1B20;
}

.phone-mockup img {
    width: 100%;
    border-radius: 30px;
    display: block;
}

/* Tutorial Section */
.orma-phonetic {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    align-items: center;
    margin-top: 4rem;
}

.tutorial-image {
    width: 100%;
    max-width: 600px;
}

.tutorial-image img {
    width: 100%;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.tutorial-step {
    margin-bottom: 2rem;
    display: flex;
    gap: 1.5rem;
}

.step-num {
    background: var(--primary);
    color: var(--on-primary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 800;
}

/* Sections */
section {
    padding: 8rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    text-align: center;
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 3rem;
    font-size: 0.875rem;
}

/* Philosophy */
.philosophy {
    background-color: var(--surface);
}

.philosophy-text {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.25rem;
    color: var(--on-surface-variant);
    text-align: center;
}

.philosophy-text p {
    margin-bottom: 1.5rem;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.feature-card {
    background: var(--surface);
    padding: 2.5rem;
    border-radius: 28px;
    transition: transform 0.3s, background-color 0.3s;
    border: 1px solid var(--outline);
}

.feature-card:hover {
    transform: translateY(-8px);
    background-color: var(--primary-container);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

/* Footer */
.footer {
    background: var(--surface);
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--surface-variant);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4rem;
}

.footer-brand p {
    margin-top: 1rem;
    color: var(--on-surface-variant);
}

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

.link-group h4 {
    margin-bottom: 1.5rem;
    color: var(--on-surface);
}

.link-group a {
    display: block;
    text-decoration: none;
    color: var(--on-surface-variant);
    margin-bottom: 0.75rem;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    color: var(--on-surface-variant);
    font-size: 0.875rem;
    padding-top: 2rem;
    border-top: 1px solid var(--surface-variant);
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 0.8s forwards ease-out;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.6s;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    .hero-content {
        padding-top: 4rem;
    }

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

    .footer-content {
        flex-direction: column;
        gap: 3rem;
    }
}