/* ==================== Fonts ==================== */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;500;600;700;800&display=swap');

/* ==================== CSS Variables ==================== */
:root {
    /* Colors */
    --bg: #000000;
    --fg: #F6F7F8;
    --muted: #C7CBD1;
    --dim: #8B90A0;
    --accent: #A78BFA;
    --accent-hover: #8B5CF6;
    --accent-ghost: rgba(167, 139, 250, 0.08);
    --accent-glow: rgba(167, 139, 250, 0.15);
    --error: #FF4C6A;
    --success: #A78BFA;

    /* Spacing */
    --space-xxl: clamp(72px, 10vw, 160px);
    --space-xl: clamp(48px, 6vw, 120px);
    --space-lg: clamp(28px, 4vw, 64px);
    --space-md: 24px;
    --space-sm: 14px;

    /* Typography */
    --h1: clamp(40px, 7vw, 72px);
    --h2: clamp(28px, 5vw, 48px);
    --h3: clamp(20px, 3.5vw, 28px);
    --body: clamp(16px, 1.6vw, 20px);
    --small: clamp(13px, 1.4vw, 15px);

    /* Layout */
    --max-width: 1200px;
    --container-padding: 24px;
    --radius: 12px;
    --radius-lg: 16px;

    /* Effects */
    --shadow: 0 0 0 1px rgba(255, 255, 255, 0.06), 0 20px 50px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 30px 70px rgba(0, 0, 0, 0.7);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== Reset & Base ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: 'Sora', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-weight: 400;
    background: radial-gradient(1400px 1400px at 50% -10%, var(--accent-ghost), transparent 65%), var(--bg);
    color: var(--fg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

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

/* ==================== Skip Link ==================== */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.skip-link:focus {
    position: fixed;
    top: 10px;
    left: 10px;
    width: auto;
    height: auto;
    padding: 12px 20px;
    background: var(--accent);
    color: var(--bg);
    font-weight: 600;
    border-radius: var(--radius);
    z-index: 9999;
}

/* ==================== Header ==================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0));
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px var(--container-padding);
    max-width: var(--max-width);
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 96px;
    width: auto;
    display: block;
    transition: opacity var(--transition-fast);
}

@media (max-width: 768px) {
    .logo-img {
        height: 72px;
    }
}

.logo-img:hover {
    opacity: 0.85;
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 999px;
    color: var(--fg);
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(255, 255, 255, 0.02);
    text-decoration: none;
    font-size: var(--small);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-cta:hover {
    border-color: var(--accent);
    background: rgba(167, 139, 250, 0.05);
    transform: translateY(-1px);
}

/* ==================== Hero Section ==================== */
.hero {
    position: relative;
    padding: calc(var(--space-xxl) + 40px) 0 var(--space-xxl);
    display: grid;
    place-items: center;
    text-align: center;
    min-height: 85vh;
}

.hero-pulse {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero-pulse::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 35%;
    width: 120vmax;
    height: 120vmax;
    transform: translate(-50%, -50%);
    background: radial-gradient(closest-side, rgba(167, 139, 250, 0.08), transparent 70%);
    border-radius: 50%;
    animation: echo 8s ease-in-out infinite;
    opacity: 0.5;
}

@keyframes echo {
    0%, 100% {
        transform: translate(-50%, -50%) scale(0.92);
        opacity: 0.3;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.08);
        opacity: 0.6;
    }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: 'Sora', sans-serif;
    font-size: var(--h1);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-family: 'Sora', sans-serif;
    font-size: var(--h3);
    color: var(--accent);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.hero-description {
    max-width: 800px;
    margin: 0 auto var(--space-xl);
    color: var(--muted);
    font-size: var(--body);
    line-height: 1.8;
}

/* ==================== CTA Button ==================== */
.cta-button {
    font-family: 'Sora', sans-serif;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: 999px;
    background: var(--accent);
    color: var(--bg);
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: var(--body);
    text-decoration: none;
    transition: all var(--transition);
    box-shadow: 0 0 0 0 var(--accent-glow);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 40px var(--accent-glow);
    background: var(--accent-hover);
}

.cta-button:active {
    transform: translateY(0);
}

.cta-button:disabled {
    background: var(--dim);
    cursor: not-allowed;
    transform: none;
}

/* ==================== Sections ==================== */
section {
    padding: var(--space-xxl) 0;
}

.section-title {
    font-family: 'Sora', sans-serif;
    font-size: var(--h2);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    text-align: center;
    letter-spacing: -0.01em;
}

/* ==================== Philosophy Section ==================== */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.philosophy-card {
    padding: var(--space-lg);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition);
    text-align: center;
}

.philosophy-card:hover {
    transform: translateY(-4px);
    border-color: rgba(167, 139, 250, 0.3);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: var(--space-md);
    filter: grayscale(0.2);
}

.philosophy-card h3 {
    font-family: 'Sora', sans-serif;
    font-size: var(--h3);
    margin-bottom: 12px;
    font-weight: 600;
}

.philosophy-card p {
    color: var(--dim);
    font-size: var(--body);
    line-height: 1.7;
}

/* ==================== Difference Section ==================== */
.difference {
    background: linear-gradient(180deg, transparent, rgba(167, 139, 250, 0.02), transparent);
}

.difference-content {
    max-width: 800px;
    margin: var(--space-xl) auto 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.difference-item {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.difference-marker {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    margin-top: 8px;
    flex-shrink: 0;
    box-shadow: 0 0 16px var(--accent-glow);
}

.difference-item h3 {
    font-family: 'Sora', sans-serif;
    font-size: var(--h3);
    margin-bottom: 8px;
    font-weight: 600;
}

.muted {
    color: var(--dim);
    line-height: 1.7;
}

/* ==================== Safety Section ==================== */
.safety-list {
    list-style: none;
    padding: 0;
    margin: var(--space-lg) auto 0;
    max-width: 700px;
    display: grid;
    gap: 16px;
}

.safety-list li {
    color: var(--muted);
    font-size: var(--body);
    padding-left: 28px;
    position: relative;
}

.safety-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 24px;
    line-height: 1;
}

/* ==================== Signup Section ==================== */
.signup {
    padding: var(--space-xxl) 0;
}

.signup-wrapper {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.signup-subtitle {
    color: var(--muted);
    font-size: var(--body);
    line-height: 1.7;
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.signup-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.form-group {
    text-align: left;
}

.form-label {
    display: block;
    font-size: var(--small);
    color: var(--dim);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 14px 18px;
    font-size: var(--body);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--fg);
    outline: none;
    transition: all var(--transition);
    font-family: inherit;
}

.form-input::placeholder {
    color: var(--dim);
    opacity: 0.6;
}

.form-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(167, 139, 250, 0.12);
    background: rgba(255, 255, 255, 0.06);
}

.form-note {
    font-size: 12px;
    color: var(--dim);
    margin-top: 8px;
    line-height: 1.6;
}

/* ==================== Message ==================== */
.message {
    margin-top: var(--space-md);
    padding: 16px 20px;
    border-radius: var(--radius);
    text-align: center;
    font-weight: 500;
    font-size: var(--small);
}

.message.success {
    background: rgba(167, 139, 250, 0.1);
    color: var(--success);
    border: 1px solid var(--accent);
}

.message.error {
    background: rgba(255, 76, 106, 0.1);
    color: var(--error);
    border: 1px solid var(--error);
}

/* ==================== Final CTA / Callout ==================== */
.final-cta {
    padding: var(--space-xl) 0;
}

.callout {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-lg);
    background: rgba(255, 255, 255, 0.02);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    text-align: center;
}

.callout-text {
    color: var(--muted);
    font-size: var(--body);
    line-height: 1.8;
}

/* ==================== Footer ==================== */
.footer {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: var(--space-xl) 0 var(--space-lg);
}

.footer-content {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-lg);
    margin-bottom: var(--space-md);
}

.footer-brand strong {
    font-size: 16px;
    letter-spacing: 0.5px;
}

.footer-tagline {
    color: var(--dim);
    font-size: var(--small);
    margin-top: 6px;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--dim);
    text-decoration: none;
    font-size: var(--small);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--fg);
}

.footer-bottom {
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.footer-bottom small {
    color: var(--dim);
    font-size: 13px;
}

/* ==================== Animations ==================== */
/* Fade in animation for hero */
.fade-in {
    animation: fadeIn 1.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

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

/* Scroll animations */
.animate-on-scroll {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Only hide if JS is loaded and animations are supported */
@media (prefers-reduced-motion: no-preference) {
    .js-loaded .animate-on-scroll:not(.animated) {
        opacity: 0;
        transform: translateY(40px);
    }
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    :root {
        --container-padding: 20px;
    }

    .nav {
        padding: 16px var(--container-padding);
    }

    .nav-brand {
        font-size: 14px;
    }

    .hero {
        min-height: 75vh;
        padding: calc(var(--space-xl) + 20px) 0 var(--space-xl);
    }

    .philosophy-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 16px;
    }

    .hero-description br {
        display: none;
    }

    .cta-button {
        width: 100%;
        padding: 14px 24px;
    }

    .philosophy-card {
        padding: var(--space-md);
    }

    .card-icon {
        font-size: 2.5rem;
    }
}

/* ==================== Dark Mode Preference ==================== */
@media (prefers-color-scheme: light) {
    /* Keep dark theme regardless - this is intentional */
}