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

:root {
    --color-background: #ffffff;
    --color-surface: #f6f6f6;
    --color-text-primary: #111111;
    --color-text-secondary: #1a1a1a;
    --color-text-muted: #555555;
    --color-border: #cccccc;
    --color-divider: #e0e0e0;
    --font-serif: 'Times New Roman', 'Georgia', serif;
    --font-sans: 'Inter', -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Menlo', 'Monaco', 'Consolas', monospace;
    --max-width: 1120px;
    --section-spacing: clamp(4rem, 7vw, 6rem);
    --hero-spacing: 4.5rem;
    --paragraph-max: 64ch;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.no-scroll {
    overflow: hidden;
}

body {
    background: var(--color-background);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: 1.0625rem;
    line-height: 1.7;
    font-weight: 400;
    padding: 0 1.5rem;
}

a {
    color: var(--color-text-primary);
    text-decoration: underline;
    text-underline-offset: 0.2rem;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--color-border);
    transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

a:hover,
a:focus-visible {
    color: var(--color-text-secondary);
    text-decoration-color: var(--color-text-primary);
    outline: none;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-border);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    padding: 0.8rem 1.6rem;
    background: var(--color-text-primary);
    color: var(--color-background);
    z-index: 1000;
    font-weight: 500;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 0.5rem;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

.label-mono {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    font-weight: 400;
}

.label-accent {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-primary);
    font-weight: 500;
    display: block;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    font-weight: 400;
    display: block;
    margin-bottom: 0.4rem;
}

h1 {
    font-family: var(--font-serif);
    font-size: 2.8rem;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--color-text-primary);
    margin-bottom: 1.25rem;
}

h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 400;
    line-height: 1.25;
    color: var(--color-text-primary);
    margin-bottom: 1.25rem;
}

.h2-large { font-size: 1.9rem; }
.h2-medium { font-size: 1.5rem; margin-bottom: 1rem; }

h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 400;
    line-height: 1.4;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
}

p {
    max-width: var(--paragraph-max);
    color: var(--color-text-secondary);
    margin-bottom: 1.2rem;
}

.p-lead {
    font-size: 1.2rem;
    color: var(--color-text-primary);
    max-width: 60ch;
}

.lead-compact {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    margin-bottom: 2.2rem;
}

.hero-tag {
    letter-spacing: 0.06em;
}

.p-accent {
    color: var(--color-text-primary);
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 500;
}

.site-header {
    padding: 1.6rem 0 0.8rem 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 2.25rem;
    position: relative;
    z-index: 100;
}

.site-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.8rem 1.8rem;
}

.logo img {
    display: block;
    height: 26px;
    width: auto;
}

.nav-primary {
    display: flex;
    align-items: center;
    gap: 1.8rem;
    flex-wrap: wrap;
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.nav-primary a {
    color: var(--color-text-secondary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.nav-primary a:hover {
    color: var(--color-text-primary);
    border-bottom-color: var(--color-text-primary);
}

.nav-cta {
    color: var(--color-background) !important;
    background: var(--color-text-primary);
    padding: 0.3rem 1.4rem;
    border: 1px solid var(--color-text-primary);
    text-decoration: none !important;
    transition: background 0.2s ease, color 0.2s ease;
}

.nav-cta:hover {
    background: var(--color-background);
    color: var(--color-text-primary) !important;
    border-color: var(--color-text-primary);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 10px;
    min-width: 44px;
    min-height: 44px;
    background: none;
    border: none;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all 0.3s ease;
    transform-origin: center;
}

.nav-open .hamburger span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-open .hamburger span:nth-child(2) {
    opacity: 0;
}

.nav-open .hamburger span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.img-stealth {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    display: block;
    object-fit: cover;
    filter: grayscale(100%) contrast(1.05);
    opacity: 0.85;
    border-bottom: 1px solid var(--color-border);
    transition: all 0.4s ease;
}

.img-stealth:hover {
    filter: grayscale(80%) contrast(1.1);
    opacity: 1;
    border-bottom-color: var(--color-text-primary);
}

.image-wrapper {
    margin: 0 0 1.5rem;
    overflow: hidden;
    background: var(--color-surface);
}

section {
    padding: var(--section-spacing) 0;
    border-bottom: 1px solid var(--color-border);
}

section:last-of-type {
    border-bottom: none;
}

.hero {
    padding: 2.5rem 0 4.75rem 0;
}

.hero h1 {
    font-size: 3.4rem;
    max-width: 18ch;
    margin-bottom: 1.2rem;
}

.hero .hero-sub {
    font-size: 1.15rem;
    max-width: 58ch;
    color: var(--color-text-primary);
    border-left: 3px solid var(--color-text-primary);
    padding-left: 1.5rem;
    margin: 0 0 1.9rem;
}

.hero-access {
    display: flex;
    align-items: center;
    gap: 0.6rem 1.8rem;
    flex-wrap: wrap;
    margin-top: 1.2rem;
}

.access-section {
    border-bottom: none;
    padding-bottom: 3rem;
}

.access-section .mt-1 {
    margin-top: 1.5rem;
}

.access-section .mt-2 {
    margin-top: 2rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem 3rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 2rem 2.5rem;
}

.divider {
    border: none;
    border-top: 1px solid var(--color-divider);
    margin: 2rem 0;
    width: 100%;
}

.method-step {
    border-top: 1px solid var(--color-divider);
    padding-top: 1.2rem;
}

.method-step:first-of-type {
    border-top: none;
    padding-top: 0;
}

.method-step .step-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    color: var(--color-text-primary);
    font-weight: 600;
    display: block;
    margin-bottom: 0.2rem;
}

.blockquote-accent {
    border-left: 3px solid var(--color-text-primary);
    padding-left: 1.6rem;
    margin: 2rem 0;
    max-width: 52ch;
}

.blockquote-accent p {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-style: italic;
    color: var(--color-text-primary);
    margin-bottom: 0;
}

.accordion {
    margin-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.accordion-item {
    border-bottom: 1px solid var(--color-border);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-item h3 {
    margin: 0;
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    background: none;
    border: none;
    padding: 1.2rem 0;
    cursor: pointer;
    text-align: left;
    gap: 1.5rem;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-primary);
    letter-spacing: 0.01em;
    background-color: transparent;
}

.accordion-header .accordion-indicator {
    font-size: 1.2rem;
    color: var(--color-text-primary);
    transition: transform 0.25s ease;
    flex-shrink: 0;
}

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

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.accordion-content-inner {
    padding-bottom: 1.5rem;
}

.accordion-content-inner p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.principle-item {
    border-top: 1px solid var(--color-divider);
    padding-top: 1.2rem;
}

.principle-item:first-of-type {
    border-top: none;
    padding-top: 0;
}

.principle-item h3 {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-primary);
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.principle-item p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.access-email-large {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    letter-spacing: 0.02em;
    color: var(--color-text-primary);
    display: inline-block;
    text-decoration: none;
    border-bottom: 2px solid var(--color-text-primary);
    padding-bottom: 0.2rem;
    transition: border-color 0.2s ease;
}

.access-email-large:hover {
    border-bottom-color: var(--color-text-muted);
}

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--color-text-primary);
    color: var(--color-background);
    border: 1px solid var(--color-text-primary);
    border-radius: 50%;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, background 0.2s ease, color 0.2s ease;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    text-decoration: none;
}

.back-to-top:hover {
    background: var(--color-background);
    color: var(--color-text-primary);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.site-footer {
    padding: 3rem 0 2.5rem 0;
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.8fr 1.2fr;
    gap: 2.5rem 3rem;
}

.footer-brand .logo img {
    display: block;
    height: 24px;
    width: auto;
    margin-bottom: 0.5rem;
}

.footer-brand .brand-tagline {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 0.2rem;
}

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

.footer-email {
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.footer-email a {
    color: var(--color-text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border);
}

.footer-email a:hover {
    border-bottom-color: var(--color-text-primary);
}

.footer-legal {
    grid-column: 1 / -1;
    border-top: 1px solid var(--color-divider);
    padding-top: 1.8rem;
    margin-top: 0.8rem;
}

.footer-legal p {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    max-width: 80ch;
}

@media (max-width: 900px) {
    .grid-2 { grid-template-columns: 1fr; gap: 2rem; }
    .grid-3 { grid-template-columns: 1fr 1fr; gap: 1.8rem; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-legal { grid-column: 1; }
    .hero { padding-top: 2.2rem; }
    .hero h1 { font-size: 2.6rem; }
}

@media (max-width: 640px) {
    .site-header-inner { flex-wrap: wrap; }
    .hamburger { display: flex; }
    .nav-primary {
        max-height: 0;
        opacity: 0;
        transform: translateY(-6px);
        overflow: hidden;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 1.25rem;
        padding: 0 0 0 0;
        border-top: none;
        margin-top: 0;
        transition: max-height 0.3s ease, opacity 0.3s ease, transform 0.3s ease, padding 0.3s ease, border-top 0.3s ease, margin-top 0.3s ease;
    }
    .nav-open .nav-primary {
        max-height: 450px;
        opacity: 1;
        transform: translateY(0);
        padding: 1rem 0 0.5rem 0;
        border-top: 1px solid var(--color-border);
        margin-top: 0.5rem;
    }
    .nav-cta { padding: 0.2rem 1rem; }
    .grid-3 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .hero { padding-bottom: 3.75rem; }
    .hero h1 { font-size: 2.2rem; margin-bottom: 1rem; }
    .hero .hero-sub { font-size: 1rem; padding-left: 1rem; margin-bottom: 1.45rem; }
    .lead-compact { margin-bottom: 1.8rem; }
    .hero-access { margin-top: 1.1rem; }
    .access-email-large { font-size: 1.4rem; }
}

@media (max-width: 420px) {
    .hero h1 { font-size: 1.8rem; }
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.4rem; }
    section { padding: 2.5rem 0; }
    .access-email-large { font-size: 1.1rem; }
    .hero-access { margin-top: 1.2rem; }
}