:root {
    --ink: #1D1D1F;
    --ink-soft: #6E6E73;
    --ink-faint: #A1A1A6;
    --paper: #F5F5F7;
    --paper-deep: #E8E8ED;
    --line: rgba(0, 0, 0, 0.08);
    --line-soft: rgba(0, 0, 0, 0.05);
    --blue: #0088FF;
    --blue-deep: #0066CC;
    --blue-tint: #EAF4FF;
}

* {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #FFFFFF;
    color: var(--ink);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

ul { list-style: none; }
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }
video { pointer-events: none; }
svg { display: inline-block; vertical-align: middle; }
button { font-family: inherit; border: none; cursor: pointer; }

#features, #privacy, #faq {
    scroll-margin-top: 5rem;
}

.main-content {
    flex-grow: 1;
}

.container-large { max-width: 72rem; margin: 0 auto; padding-left: 1.5rem; padding-right: 1.5rem; }
.container-medium { max-width: 42rem; margin: 0 auto; padding-left: 1.5rem; padding-right: 1.5rem; }
.container-small { max-width: 36rem; margin: 0 auto; padding-left: 1.5rem; padding-right: 1.5rem; }

.prism-glow {
    background: conic-gradient(from 180deg at 50% 50%, #7B61FF, #0088FF, #00C2A8, #FFB300, #FF5C72, #7B61FF);
    filter: blur(90px);
}

.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.media-box {
    width: 100%;
    border-radius: 1rem;
    background-color: var(--paper);
    object-fit: cover;
    padding: 0;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
}

[data-store="edge"] {
    display: none !important;
}
html.is-edge [data-store="chrome"] {
    display: none !important;
}
html.is-edge [data-store="edge"] {
    display: inline-flex !important;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    font-weight: 500;
    transition: color 0.25s, background-color 0.25s, border-color 0.25s, box-shadow 0.25s, transform 0.25s;
    border-radius: 9999px;
}

.btn svg.btn-icon {
    width: 1.5rem;
    height: 1.5rem;
    flex-shrink: 0;
}

.btn-small svg.btn-icon {
    width: 1rem;
    height: 1rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 13px;
    background-color: var(--ink);
    color: #FFFFFF;
}
.btn-small:hover {
    background-color: rgba(29, 29, 31, 0.85);
}

.btn-large {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    width: 100%;
    gap: 0.5rem;
}
@media (min-width: 640px) {
    .btn-large { width: auto; }
}

.btn-brand {
    background-color: var(--blue);
    color: #FFFFFF;
    box-shadow: 0 10px 15px -3px rgba(0, 136, 255, 0.2), 0 4px 6px -4px rgba(0, 136, 255, 0.2);
}
.btn-brand:hover {
    background-color: var(--blue-deep);
}

.btn-white {
    background-color: #FFFFFF;
    color: var(--ink);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
}
.btn-white:hover {
    background-color: rgba(255, 255, 255, 0.9);
}

.btn-submit {
    width: 100%;
    padding: 0.875rem 1.5rem;
    border-radius: 0.75rem;
    background-color: var(--ink);
    color: #FFFFFF;
    font-size: 1rem;
}
.btn-submit:hover {
    background-color: rgba(29, 29, 31, 0.85);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
}

.header-container {
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}
.brand-icon {
    border-radius: 6px;
}
.brand-text {
    font-weight: 600;
    font-size: 15px;
    letter-spacing: -0.025em;
    color: var(--ink);
}

.header-nav {
    display: none;
    align-items: center;
    gap: 20px;
    font-size: 13px;
    font-weight: 500;
    color: var(--ink-soft);
}
@media (min-width: 768px) {
    .header-nav { display: flex; }
}
.header-nav a {
    transition: color 0.2s ease;
}
.header-nav a:hover {
    color: var(--ink);
}

.hero {
    position: relative;
    padding: 5rem 1.5rem 4rem;
    text-align: center;
    overflow: hidden;
}
@media (min-width: 768px) {
    .hero { padding-top: 7rem; }
}

.hero-glow-layer {
    position: absolute;
    top: -10rem;
    left: 50%;
    transform: translateX(-50%);
    width: 720px;
    height: 420px;
    opacity: 0.12;
    pointer-events: none;
}

.hero-content {
    position: relative;
}

.hero-title {
    font-size: 2.6rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.05;
    margin-bottom: 1.5rem;
    color: var(--ink);
}
@media (min-width: 768px) {
    .hero-title { font-size: 4.75rem; }
}

.hero-desc {
    max-width: 36rem;
    margin: 0 auto 2.5rem;
    font-size: 1rem;
    line-height: 1.625;
    color: var(--ink-soft);
}
@media (min-width: 768px) {
    .hero-desc { font-size: 1.125rem; }
}

.hero-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}
@media (min-width: 640px) {
    .hero-actions { flex-direction: row; }
}

.hero-note {
    font-size: 0.75rem;
    color: var(--ink-faint);
    margin-bottom: 1.25rem;
}

.feature-section {
    padding-top: 6rem;
    padding-bottom: 6rem;
}
.feature-section.bg-paper {
    background-color: var(--paper);
}
.feature-section.bg-white {
    background-color: #FFFFFF;
}
@media (min-width: 768px) {
    .feature-section {
        padding-top: 8rem;
        padding-bottom: 8rem;
    }
}

.feature-header {
    text-align: center;
    margin-bottom: 4rem;
}
.feature-title {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
    color: var(--ink);
}
@media (min-width: 768px) {
    .feature-title { font-size: 2.25rem; }
}
.feature-subtitle {
    font-size: 0.875rem;
    color: var(--ink-soft);
    max-width: 36rem;
    margin: 0 auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3.5rem;
    align-items: center;
}
@media (min-width: 768px) {
    .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.content-first { order: 2; text-align: left; }
.media-first { order: 1; }
@media (min-width: 768px) {
    .content-first { order: 1; }
    .media-first { order: 2; }
}

.content-second { text-align: left; }

.feature-text-title {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 1.25rem;
    color: var(--ink);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
@media (min-width: 768px) {
    .feature-text-title { font-size: 2.25rem; }
}

.feature-text-desc {
    font-size: 0.875rem;
    color: var(--ink-soft);
    line-height: 1.625;
    margin-bottom: 1.5rem;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    font-size: 0.875rem;
    color: rgba(29, 29, 31, 0.8);
}
.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}
.feature-list svg {
    width: 1rem;
    height: 1rem;
    color: var(--blue);
}

.privacy-grid {
    display: grid;
    grid-template-columns: repeat(1, minmax(0, 1fr));
    gap: 1.25rem;
    text-align: left;
}
@media (min-width: 768px) {
    .privacy-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.privacy-card {
    background-color: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: 1rem;
    padding: 2rem;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.35s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.35s;
}
.privacy-card:hover {
    border-color: rgba(0, 0, 0, 0.14);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.06);
    transform: translateY(-3px);
}
.privacy-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.75rem;
    background-color: #FFFFFF;
    border: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blue);
    margin-bottom: 1.5rem;
}
.privacy-icon svg { width: 1.25rem; height: 1.25rem; }
.privacy-card-title {
    font-weight: 600;
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}
.privacy-card-desc {
    font-size: 0.875rem;
    color: var(--ink-soft);
    line-height: 1.625;
}

.faq-header {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--ink);
}
@media (min-width: 768px) {
    .faq-header { font-size: 2.25rem; }
}

.faq-list {
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.faq-list > * + * {
    border-top: 1px solid var(--line);
}

.faq-item {
    padding-top: 1.25rem;
    padding-bottom: 1.25rem;
}
.faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    cursor: pointer;
    list-style: none;
    transition: opacity 0.2s;
}
.faq-item summary::-webkit-details-marker {
    display: none;
}
.faq-question {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--ink);
}
.faq-chevron {
    width: 1rem;
    height: 1rem;
    color: var(--ink-faint);
    flex-shrink: 0;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

details.is-open .faq-chevron {
    transform: rotate(180deg);
}

details .faq-content {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
details.is-open .faq-content {
    grid-template-rows: 1fr;
}
details .faq-content > p {
    min-height: 0;
    overflow: hidden;
    margin-top: 0 !important;
    padding-top: 0;
    opacity: 0;
    font-size: 0.875rem;
    color: var(--ink-soft);
    line-height: 1.625;
    transition: padding-top 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.15s ease 0s;
}
details.is-open .faq-content > p {
    padding-top: 0.75rem;
    opacity: 1;
    transition: padding-top 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.35s ease 0.1s;
}

.cta-box {
    position: relative;
    border-radius: 1.5rem;
    background-color: var(--ink);
    padding: 2.5rem;
    text-align: center;
    overflow: hidden;
}
@media (min-width: 768px) {
    .cta-box { padding: 5rem; }
}

.cta-glow-layer {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 300px;
    opacity: 0.2;
    pointer-events: none;
}

.cta-title {
    position: relative;
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
    color: #FFFFFF;
}
@media (min-width: 768px) {
    .cta-title { font-size: 2.25rem; }
}

.cta-subtitle {
    position: relative;
    color: rgba(255, 255, 255, 0.6);
    max-width: 28rem;
    margin: 0 auto 2rem;
    font-size: 0.875rem;
}

.site-footer {
    border-top: 1px solid var(--line);
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}
@media (min-width: 768px) {
    .footer-container {
        flex-direction: row;
    }
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.footer-brand {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--ink);
}
.footer-copyright {
    font-size: 0.75rem;
    color: var(--ink-faint);
}
.footer-credit {
    font-size: 0.75rem;
    color: var(--ink-faint);
    margin-top: 0.25rem;
}
@media (min-width: 768px) {
    .footer-credit { margin-top: 0; }
}
.footer-credit a {
    color: var(--ink);
    font-weight: 600;
    transition: color 0.2s ease;
}
.footer-credit a:hover {
    color: var(--blue-deep);
}

.footer-right {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}
@media (min-width: 768px) {
    .footer-right { align-items: flex-end; }
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--ink-soft);
}
.footer-links a {
    transition: color 0.2s ease;
}
.footer-links a:hover {
    color: var(--ink);
}

.inner-hero {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    padding-top: 4rem;
    padding-bottom: 2.5rem;
    text-align: center;
}

.inner-title {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--ink);
    margin-bottom: 1rem;
}
@media (min-width: 768px) {
    .inner-title { font-size: 3rem; line-height: 1; }
}

.inner-subtitle {
    color: var(--ink-soft);
    font-size: 0.875rem;
    max-width: 28rem;
    margin: 0 auto;
}

.form-wrapper {
    max-width: 36rem;
    margin: 0 auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    padding-bottom: 6rem;
}

.form-layout {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ink-faint);
}

.form-input {
    width: 100%;
    background-color: var(--paper);
    border: 1px solid var(--line);
    border-radius: 0.75rem;
    padding: 0.85rem 1rem;
    font-size: 0.875rem;
    color: var(--ink);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    font-family: inherit;
}
.form-input::placeholder {
    color: var(--ink-faint);
}
.form-input:focus {
    outline: none;
    background-color: #FFFFFF;
    border-color: var(--blue);
    box-shadow: 0 0 0 3px var(--blue-tint);
}
textarea.form-input {
    resize: none;
}

.privacy-wrapper {
    max-width: 42rem;
    margin: 0 auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    padding-bottom: 6rem;
}
.privacy-content {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    color: var(--ink-soft);
    font-size: 0.875rem;
    line-height: 1.625;
}
.privacy-heading {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.75rem;
}
.privacy-code {
    background-color: var(--paper);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    color: var(--ink);
}
.privacy-list {
    list-style-type: disc;
    padding-left: 1.25rem;
    margin-top: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    color: var(--ink-soft);
}
.privacy-list strong {
    color: var(--ink);
}