:root {
    --primary-color: #2578E3;
    --primary-light: #589EFF;
    --secondary-color: #1B5FBF;
    --background-color: #F2F2F7;
    --text-color: #1C1C1E;
    --text-muted: #6E6E73;
    --card-background: #FFFFFF;
    --accent-color: #34C759;
    --border-color: #E5E5EA;
    --code-background: #0D284A;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #4E9BFF;
        --primary-light: #7CB8FF;
        --secondary-color: #589EFF;
        --background-color: #1C1C1E;
        --text-color: #F5F5F7;
        --text-muted: #A1A1A6;
        --card-background: #2C2C2E;
        --accent-color: #30D158;
        --border-color: #38383A;
        --code-background: #0A1F3A;
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

a {
    color: inherit;
}

code, .mono {
    font-family: 'SF Mono', 'Menlo', 'Consolas', monospace;
    overflow-wrap: break-word;
    word-break: break-word;
}

img, svg {
    max-width: 100%;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(242, 242, 247, 0.75);
    border-bottom: 1px solid transparent;
}

@supports (backdrop-filter: blur(20px)) {
    .header {
        backdrop-filter: blur(20px) saturate(180%);
        -webkit-backdrop-filter: blur(20px) saturate(180%);
    }
}

@media (prefers-color-scheme: dark) {
    .header {
        background-color: rgba(28, 28, 30, 0.7);
    }
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 14px;
    padding-bottom: 14px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-color);
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: block;
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

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

.nav-store-badge {
    height: 34px;
    display: block;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    padding: 6px;
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
    display: block;
}

/* Hero */
.hero {
    background: linear-gradient(150deg, var(--primary-light), var(--primary-color) 60%, var(--secondary-color));
    color: white;
    padding: 168px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 85% 15%, rgba(255,255,255,0.18), transparent 55%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-text {
    flex: 1;
    max-width: 560px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 22px;
    backdrop-filter: blur(6px);
}

.hero h1 {
    font-size: 3rem;
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.hero .tagline {
    font-size: 1.3rem;
    font-weight: 600;
    opacity: 0.96;
    margin-bottom: 16px;
}

.hero p.hero-sub {
    font-size: 1.05rem;
    opacity: 0.9;
    max-width: 480px;
    margin-bottom: 36px;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
}

.app-store-button {
    display: inline-block;
    transition: transform 0.2s ease;
}

.app-store-button:hover {
    transform: scale(1.04);
}

.app-store-badge {
    height: 54px;
    display: block;
}

.hero-note {
    font-size: 0.82rem;
    opacity: 0.75;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-screenshot {
    width: 280px;
    max-width: 100%;
    height: auto;
    border-radius: 36px;
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.35);
    transition: transform 0.3s ease;
}

.hero-screenshot:hover {
    transform: translateY(-8px);
}

/* Screenshots */
.screenshots {
    padding: 90px 0;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 50px;
}

.section-header h2 {
    font-size: 2.1rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

.screenshot-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.screenshot-figure {
    margin: 0;
}

.screenshot-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 24px;
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.12);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshot-img:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 44px rgba(0, 0, 0, 0.18);
}

.screenshot-figure figcaption {
    margin-top: 14px;
    font-size: 0.88rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.5;
}

/* Features */
.features {
    padding: 90px 0;
    background: var(--card-background);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    padding: 32px 28px;
    border-radius: 18px;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.08);
}

.feature-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    color: white;
}

.feature-icon svg {
    width: 22px;
    height: 22px;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.55;
}

/* How it works */
.how-it-works {
    padding: 90px 0;
}

.steps-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    max-width: 960px;
    margin: 0 auto;
}

.step {
    text-align: left;
}

.step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.step h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.step p {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* Privacy trust block */
.privacy-trust {
    padding: 90px 0;
    background: linear-gradient(160deg, var(--secondary-color), var(--primary-color));
    color: white;
    position: relative;
    overflow: hidden;
}

.privacy-trust::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 10% 90%, rgba(255,255,255,0.12), transparent 55%);
    pointer-events: none;
}

.privacy-trust .container {
    position: relative;
    z-index: 1;
}

.privacy-trust .section-header h2,
.privacy-trust .section-header p {
    color: white;
}

.privacy-trust .section-header p {
    opacity: 0.9;
}

.privacy-trust .section-header a {
    color: white;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.privacy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 24px;
}

.privacy-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 28px 24px;
    border-radius: 16px;
    backdrop-filter: blur(6px);
}

.privacy-card .privacy-icon {
    display: block;
    margin-bottom: 14px;
}

.privacy-card .privacy-icon svg {
    width: 26px;
    height: 26px;
}

.privacy-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.privacy-card p {
    font-size: 0.9rem;
    opacity: 0.92;
    line-height: 1.5;
}

/* Download / final CTA */
.download {
    padding: 100px 0;
    text-align: center;
}

.download h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 14px;
}

.download p {
    color: var(--text-muted);
    max-width: 480px;
    margin: 0 auto 32px;
}

/* FAQ (shared by index teaser + faq.html) */
.faq {
    padding: 90px 0;
    background: var(--card-background);
}

.faq-list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.faq-item {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
}

.faq-item summary {
    padding: 20px 24px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    list-style: none;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--primary-color);
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.faq-item details[open] summary::after {
    transform: rotate(45deg);
}

.faq-item .faq-content {
    padding: 0 24px 22px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.65;
}

.faq-item .faq-content p + p {
    margin-top: 12px;
}

.faq-item .faq-content code {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    padding: 2px 6px;
    border-radius: 5px;
    font-size: 0.85em;
}

/* Support page */
.page-hero {
    padding: 150px 0 60px;
    text-align: center;
}

.page-hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    margin-bottom: 14px;
}

.page-hero p {
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto;
    font-size: 1.05rem;
}

.support-section {
    padding: 20px 0 90px;
}

.support-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 60px;
}

.support-card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 26px 26px;
}

.support-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.support-card p, .support-card li {
    color: var(--text-muted);
    font-size: 0.93rem;
    line-height: 1.6;
}

.support-card ul, .support-card ol {
    padding-left: 20px;
    margin-top: 8px;
}

.contact-box {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    padding: 36px;
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
}

.contact-box h2 {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.contact-box p {
    color: var(--text-muted);
    margin-bottom: 20px;
}

.contact-actions {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(37, 120, 227, 0.3);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.confirm-flag {
    display: inline-block;
    background: rgba(255, 149, 0, 0.15);
    color: #B25E00;
    border: 1px solid rgba(255, 149, 0, 0.35);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-left: 6px;
    vertical-align: middle;
}

@media (prefers-color-scheme: dark) {
    .confirm-flag {
        color: #FFB454;
    }
}

/* Policy / Terms pages */
.policy-page,
.terms-page {
    padding-top: 130px;
    padding-bottom: 80px;
}

.policy-content,
.terms-content {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    padding: 44px;
    border-radius: 18px;
    max-width: 780px;
    margin: 0 auto;
}

.policy-content h1,
.terms-content h1 {
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 2.1em;
    font-weight: 800;
}

.policy-meta {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 30px;
}

.policy-content h2,
.terms-content h2 {
    color: var(--primary-color);
    margin-top: 34px;
    margin-bottom: 14px;
    font-size: 1.35em;
}

.policy-content p,
.policy-content ul,
.policy-content ol,
.terms-content p,
.terms-content ul,
.terms-content ol {
    margin-bottom: 15px;
    line-height: 1.7;
    color: var(--text-color);
}

.policy-content ul,
.policy-content ol,
.terms-content ul,
.terms-content ol {
    padding-left: 22px;
}

.policy-content a,
.terms-content a {
    color: var(--primary-color);
    text-decoration: none;
}

.policy-content a:hover,
.terms-content a:hover {
    text-decoration: underline;
}

.policy-callout {
    background: rgba(37, 120, 227, 0.08);
    border-left: 3px solid var(--primary-color);
    padding: 16px 20px;
    border-radius: 0 10px 10px 0;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background-color: var(--card-background);
    padding: 60px 0 40px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 26px;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
}

.footer-logo img {
    width: 28px;
    height: 28px;
    border-radius: 7px;
}

.footer-links {
    display: flex;
    gap: 22px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.92rem;
    transition: color 0.2s ease;
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

.copyright {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-disclaimer {
    font-size: 0.8rem;
    color: var(--text-muted);
    max-width: 520px;
}

/* Responsive */
@media (max-width: 900px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .support-grid {
        grid-template-columns: 1fr;
    }

    .screenshot-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 880px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
        background: var(--card-background);
        border-bottom: 1px solid var(--border-color);
        padding: 16px 24px 22px;
    }

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

    .nav-links li {
        width: 100%;
        padding: 10px 0;
    }

    .menu-toggle {
        display: block;
    }

    .hero {
        padding: 140px 0 70px;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 44px;
    }

    .hero-text {
        max-width: 100%;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-cta {
        align-items: center;
        width: 100%;
    }

    .hero p.hero-sub {
        margin-left: auto;
        margin-right: auto;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .screenshot-row {
        grid-template-columns: 1fr;
        gap: 20px;
        max-width: 320px;
    }

    .steps-row {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .step {
        text-align: center;
    }

    .step-number {
        margin-left: auto;
        margin-right: auto;
    }

    .section-header h2 {
        font-size: 1.7rem;
    }

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

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

    .policy-content,
    .terms-content {
        padding: 28px 22px;
    }

    .page-hero {
        padding: 120px 0 40px;
    }
}