/*
    Vanguard Procurement Group — "The Ledger" design system
    Warm paper, brand navy ink, chevron green, audit red.
    Display: Archivo Expanded · Body: Archivo · Data: Spline Sans Mono
*/

:root {
    --paper: #F6F4EF;
    --paper-deep: #EEEBE2;
    --ink: #14264C;
    --ink-deep: #0D1A36;
    --ink-soft: #47526B;
    --green: #17724B;
    --green-deep: #0F5B3A;
    --red: #B23A2A;
    --line: rgba(20, 38, 76, 0.16);
    --line-soft: rgba(20, 38, 76, 0.09);
    --on-ink: #EEF1F8;
    --on-ink-soft: #A9B4CC;
    --line-on-ink: rgba(238, 241, 248, 0.15);

    --font-body: 'Archivo', 'Noto Sans SC', system-ui, sans-serif;
    --font-mono: 'Spline Sans Mono', 'Noto Sans SC', monospace;

    --r-sm: 3px;
    --r-md: 6px;
    --r-lg: 10px;

    --shadow-card:
        0 1px 2px rgba(13, 26, 54, 0.06),
        0 4px 12px rgba(13, 26, 54, 0.07),
        0 16px 32px rgba(13, 26, 54, 0.06);

    --ease: cubic-bezier(0.2, 0, 0, 1);
    --header-h: 76px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
    font-family: var(--font-body);
    background-color: var(--paper);
    color: var(--ink);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
    font-family: var(--font-body);
    line-height: 1.1;
    text-wrap: balance;
}

p { text-wrap: pretty; }

a { color: inherit; }

img { max-width: 100%; height: auto; display: block; }

.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

.visually-hidden {
    position: absolute;
    width: 1px; height: 1px;
    margin: -1px; padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* Numbers never shift layout */
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

:focus-visible {
    outline: 2px solid var(--green);
    outline-offset: 3px;
    border-radius: var(--r-sm);
}

/* ---------- Skip link ---------- */
.skip-link {
    position: absolute;
    top: -60px; left: 24px;
    z-index: 200;
    background: var(--ink);
    color: var(--on-ink);
    padding: 10px 18px;
    border-radius: var(--r-md);
    font-weight: 600;
    font-size: 0.875rem;
    text-decoration: none;
    transition: top 200ms var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- Shared vocabulary ---------- */
.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--green);
    margin-bottom: 20px;
}

.section { padding: 104px 0; }

.section-head {
    max-width: 640px;
    margin-bottom: 64px;
}

.section-title {
    font-size: clamp(1.9rem, 4vw, 2.75rem);
    font-weight: 750;
    font-stretch: 118%;
    letter-spacing: -0.015em;
    margin-bottom: 18px;
}

.section-desc {
    font-size: 1.06rem;
    color: var(--ink-soft);
}

/* Ink (dark navy) sections */
.section-ink {
    background: var(--ink-deep);
    color: var(--on-ink);
}
.section-ink .section-desc { color: var(--on-ink-soft); }
.section-ink .eyebrow { color: #5FBF92; }
.section-ink :focus-visible { outline-color: #5FBF92; }

/* Tinted paper section */
.section-tint { background: var(--paper-deep); }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 26px;
    border: 1px solid transparent;
    border-radius: var(--r-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition-property: background-color, border-color, color, transform;
    transition-duration: 160ms;
    transition-timing-function: var(--ease);
}
.btn:active { transform: scale(0.96); }

.btn-primary {
    background: var(--green);
    color: #FFFFFF;
}
.btn-primary:hover { background: var(--green-deep); }

.btn-ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--ink); }

.btn-block { width: 100%; }

/* ---------- Header ---------- */
.header {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--header-h);
    background: rgba(246, 244, 239, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    z-index: 100;
    transition: border-color 240ms var(--ease);
}
.header.scrolled { border-bottom-color: var(--line-soft); }

.nav-bar {
    height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo img { height: 48px; width: auto; }

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

.nav-link {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--ink-soft);
    text-decoration: none;
    padding: 12px 2px;
    transition: color 160ms var(--ease);
}
.nav-link:hover { color: var(--ink); }

.nav-cta { min-height: 42px; padding: 9px 20px; font-size: 0.88rem; }

.nav-tools { display: flex; align-items: center; gap: 12px; }

.lang-select {
    appearance: none;
    -webkit-appearance: none;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--ink);
    background:
        url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%2314264C' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E")
        no-repeat right 12px center,
        transparent;
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    padding: 10px 32px 10px 14px;
    min-height: 42px;
    cursor: pointer;
    transition: border-color 160ms var(--ease);
}
.lang-select:hover { border-color: var(--ink); }

/* Mobile toggle */
.mobile-toggle {
    display: none;
    width: 44px; height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
}
.mobile-toggle span {
    position: absolute;
    left: 10px;
    width: 24px; height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition-property: transform, top;
    transition-duration: 220ms;
    transition-timing-function: var(--ease);
}
.mobile-toggle span:nth-child(1) { top: 17px; }
.mobile-toggle span:nth-child(2) { top: 25px; }
.mobile-toggle[aria-expanded="true"] span:nth-child(1) { top: 21px; transform: rotate(45deg); }
.mobile-toggle[aria-expanded="true"] span:nth-child(2) { top: 21px; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
    padding: calc(var(--header-h) + 88px) 0 96px;
    border-bottom: 1px solid var(--line-soft);
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 64px;
    align-items: center;
}

.hero-title {
    font-size: clamp(2.4rem, 5.4vw, 4rem);
    font-weight: 800;
    font-stretch: 122%;
    letter-spacing: -0.02em;
    line-height: 1.04;
    margin-bottom: 26px;
}

/* Struck-through cost — the audit red line */
.hero-title s {
    display: block;
    color: var(--ink-soft);
    text-decoration: line-through;
    text-decoration-color: var(--red);
    text-decoration-thickness: 0.07em;
}
@media (prefers-reduced-motion: no-preference) {
    .hero-title s {
        text-decoration-color: transparent;
        animation: strike 10ms linear 750ms forwards;
    }
    @keyframes strike { to { text-decoration-color: var(--red); } }
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--ink-soft);
    max-width: 520px;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* ---------- The Ledger (signature) ---------- */
.ledger {
    background: #FFFFFF;
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-card);
    outline: 1px solid rgba(0, 0, 0, 0.08);
    outline-offset: -1px;
    padding: 26px 26px 22px;
}

.ledger-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--ink);
    margin-bottom: 4px;
}

.ledger-ref {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--red);
}

.ledger-name {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    color: var(--ink-soft);
    text-align: right;
}

.ledger-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.ledger-table th {
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-soft);
    text-align: right;
    padding: 12px 0 8px;
}
.ledger-table th:first-child { text-align: left; }

.ledger-table td {
    padding: 11px 0;
    border-top: 1px solid var(--line-soft);
    text-align: right;
}
.ledger-table td:first-child { text-align: left; font-weight: 500; }
.ledger-table td.num { font-size: 0.85rem; color: var(--ink-soft); }
.ledger-table td.save { color: var(--green); font-weight: 600; }

.ledger-table tfoot td {
    border-top: 2px solid var(--ink);
    padding-top: 13px;
    font-weight: 600;
}
.ledger-table tfoot td.save.total { font-size: 1.05rem; }

.ledger-stamp {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    padding: 8px 14px;
    border: 1.5px solid var(--green);
    border-radius: var(--r-sm);
    color: var(--green);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    transform: rotate(-1.5deg);
}

/* ---------- ERP strip ---------- */
.erp-strip {
    margin-top: 88px;
    text-align: center;
}

.erp-title {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-soft);
    margin-bottom: 20px;
}

.erp-list {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px 40px;
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--ink);
    opacity: 0.55;
}

/* ---------- Audit findings ---------- */
.findings {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 72px;
}

.finding {
    display: flex;
    gap: 22px;
    padding: 26px 0;
    border-top: 1px solid var(--line);
}

.finding-ref {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--red);
    padding-top: 3px;
    flex-shrink: 0;
}

.finding-body h3 {
    font-size: 1.1rem;
    font-weight: 650;
    margin-bottom: 6px;
}

.finding-body p {
    font-size: 0.94rem;
    color: var(--ink-soft);
}

/* ---------- Services / modules ---------- */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 56px;
    border-bottom: 1px solid var(--line-on-ink);
}

.tab {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    padding: 14px 18px;
    min-height: 48px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--on-ink-soft);
    cursor: pointer;
    transition-property: color, border-color;
    transition-duration: 160ms;
    transition-timing-function: var(--ease);
}
.tab:hover { color: var(--on-ink); }
.tab[aria-selected="true"] {
    color: var(--on-ink);
    border-bottom-color: #5FBF92;
}

.panel-intro {
    max-width: 680px;
    margin-bottom: 48px;
}

.panel-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #5FBF92;
    margin-bottom: 14px;
}

.panel-title {
    font-size: clamp(1.4rem, 2.6vw, 1.9rem);
    font-weight: 700;
    font-stretch: 115%;
    margin-bottom: 14px;
}

.panel-desc { color: var(--on-ink-soft); font-size: 1rem; }

.modules {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.module {
    border: 1px solid var(--line-on-ink);
    border-radius: var(--r-lg);
    padding: 28px;
    transition: border-color 200ms var(--ease);
}
.module:hover { border-color: rgba(95, 191, 146, 0.5); }

.module-code {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: #5FBF92;
    margin-bottom: 14px;
}

.module h4 { font-size: 1.08rem; font-weight: 650; margin-bottom: 8px; }
.module p { font-size: 0.92rem; color: var(--on-ink-soft); }

/* Panel switch animation */
@media (prefers-reduced-motion: no-preference) {
    .panel:not([hidden]) { animation: panel-in 320ms var(--ease); }
    @keyframes panel-in {
        from { opacity: 0; transform: translateY(10px); }
        to { opacity: 1; transform: translateY(0); }
    }
}

/* ---------- ROI calculator ---------- */
.calc-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 28px;
    align-items: stretch;
}

.calc-card {
    background: #FFFFFF;
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-card);
    outline: 1px solid rgba(0, 0, 0, 0.08);
    outline-offset: -1px;
    padding: 40px;
}

.calc-title {
    font-size: 1.3rem;
    font-weight: 700;
    font-stretch: 112%;
    margin-bottom: 32px;
}

.calc-field label {
    display: block;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--ink-soft);
    margin-bottom: 10px;
}

.calc-readout {
    display: block;
    font-size: clamp(1.8rem, 3.4vw, 2.4rem);
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.01em;
    margin-bottom: 16px;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 4px;
    background: var(--line);
    outline-offset: 6px;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px; height: 22px;
    border-radius: 50%;
    background: var(--green);
    border: 3px solid #FFFFFF;
    box-shadow: 0 1px 4px rgba(13, 26, 54, 0.35);
    transition: transform 140ms var(--ease);
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.12); }
input[type="range"]::-moz-range-thumb {
    width: 16px; height: 16px;
    border-radius: 50%;
    background: var(--green);
    border: 3px solid #FFFFFF;
    box-shadow: 0 1px 4px rgba(13, 26, 54, 0.35);
}

.calc-results {
    margin-top: 36px;
    border-top: 2px solid var(--ink);
}

.calc-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
    padding: 15px 0;
    border-bottom: 1px solid var(--line-soft);
}
.calc-row:last-child { border-bottom: none; }

.calc-row dt { font-size: 0.9rem; color: var(--ink-soft); }
.calc-row dd { font-size: 1.02rem; font-weight: 600; text-align: right; }
.calc-row dd.accent { color: var(--green); font-size: 1.25rem; }

.guarantee {
    background: var(--ink-deep);
    color: var(--on-ink);
    border-radius: var(--r-lg);
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.guarantee-seal {
    width: 64px; height: 64px;
    border: 2px solid #5FBF92;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 600;
    color: #5FBF92;
    margin-bottom: 24px;
    transform: rotate(-6deg);
}

.guarantee h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; }
.guarantee p { color: var(--on-ink-soft); font-size: 0.98rem; }

/* ---------- Why Vanguard checklist ---------- */
.checklist {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 44px 56px;
}

.checklist li { position: relative; padding-left: 34px; }

.checklist li::before {
    content: '';
    position: absolute;
    left: 0; top: 2px;
    width: 20px; height: 20px;
    border-radius: 50%;
    background:
        url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24'%3E%3Cpolyline points='20 6 9 17 4 12' fill='none' stroke='%23FFFFFF' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
        no-repeat center,
        var(--green);
}

.checklist h3 { font-size: 1.05rem; font-weight: 650; margin-bottom: 6px; }
.checklist p { font-size: 0.92rem; color: var(--ink-soft); }

/* ---------- Founder ---------- */
.founder-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 64px;
    align-items: center;
}

.founder-photo img {
    border-radius: var(--r-lg);
    outline: 1px solid rgba(0, 0, 0, 0.1);
    outline-offset: -1px;
}

.founder-quote {
    font-size: clamp(1.3rem, 2.4vw, 1.65rem);
    font-weight: 650;
    font-stretch: 110%;
    line-height: 1.3;
    letter-spacing: -0.01em;
    border-left: 3px solid var(--green);
    padding-left: 24px;
    margin-bottom: 28px;
}

.founder-copy > p {
    font-size: 0.98rem;
    color: var(--ink-soft);
    margin-bottom: 18px;
}

.founder-sig { margin-top: 30px; }
.founder-sig strong {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
}
.founder-sig span {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--ink-soft);
}

/* ---------- Contact ---------- */
.contact-wrap { max-width: 560px; margin: 0 auto; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.form-field { margin-bottom: 20px; }

.form-field label {
    display: block;
    font-size: 0.86rem;
    font-weight: 500;
    color: var(--on-ink-soft);
    margin-bottom: 8px;
}

.form-field input,
.form-field select {
    width: 100%;
    min-height: 48px;
    padding: 12px 14px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--on-ink);
    background: rgba(238, 241, 248, 0.06);
    border: 1px solid var(--line-on-ink);
    border-radius: var(--r-md);
    transition-property: border-color, background-color;
    transition-duration: 160ms;
    transition-timing-function: var(--ease);
}

.form-field select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23A9B4CC' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}
.form-field select option { color: var(--ink); background: #FFFFFF; }

.form-field input:focus,
.form-field select:focus {
    outline: none;
    border-color: #5FBF92;
    background-color: rgba(238, 241, 248, 0.1);
}

.form-field input.invalid { border-color: #E07B6A; }

.form-error {
    margin-top: 16px;
    text-align: center;
    font-size: 0.88rem;
    color: #E07B6A;
}

.contact-alt {
    margin-top: 22px;
    text-align: center;
    font-size: 0.88rem;
    color: var(--on-ink-soft);
}
.contact-alt a {
    color: #5FBF92;
    font-weight: 600;
    text-decoration: none;
}
.contact-alt a:hover { text-decoration: underline; }

.form-success {
    text-align: center;
    padding: 56px 32px;
    border: 1px solid var(--line-on-ink);
    border-radius: var(--r-lg);
}
.form-success svg { color: #5FBF92; margin: 0 auto 20px; }
.form-success h3 { font-size: 1.35rem; font-weight: 700; margin-bottom: 10px; }
.form-success p { color: var(--on-ink-soft); }

@media (prefers-reduced-motion: no-preference) {
    .form-success:not([hidden]) { animation: panel-in 320ms var(--ease); }
}

/* ---------- Footer ---------- */
.footer {
    background: var(--ink-deep);
    color: var(--on-ink-soft);
    padding: 72px 0 36px;
    border-top: 1px solid var(--line-on-ink);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 56px;
    margin-bottom: 56px;
}

.footer-logo {
    height: 48px;
    width: auto;
    margin-bottom: 20px;
    filter: brightness(0) invert(1);
    opacity: 0.9;
}

.footer-brand p { font-size: 0.9rem; max-width: 340px; }

.footer h4 {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--on-ink);
    margin-bottom: 18px;
}

.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; font-size: 0.9rem; }
.footer a {
    color: var(--on-ink-soft);
    text-decoration: none;
    transition: color 160ms var(--ease);
}
.footer a:hover { color: var(--on-ink); }

.footer-rights {
    padding-top: 28px;
    border-top: 1px solid var(--line-on-ink);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    text-align: center;
}

/* ---------- Scroll reveal ---------- */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(14px);
        transition-property: opacity, transform;
        transition-duration: 560ms;
        transition-timing-function: var(--ease);
    }
    .reveal.in { opacity: 1; transform: translateY(0); }
}

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

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .hero-grid { gap: 44px; }
    .checklist { grid-template-columns: repeat(2, 1fr); gap: 36px 44px; }
    .founder-grid { gap: 44px; }
}

@media (max-width: 860px) {
    .section { padding: 80px 0; }

    .hero { padding-top: calc(var(--header-h) + 56px); padding-bottom: 72px; }
    .hero-grid { grid-template-columns: 1fr; gap: 48px; }
    .hero-desc { max-width: none; }

    .findings { grid-template-columns: 1fr; column-gap: 0; }
    .modules { grid-template-columns: 1fr; }
    .calc-grid { grid-template-columns: 1fr; }
    .founder-grid { grid-template-columns: 1fr; }
    .founder-photo { max-width: 380px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }

    /* Mobile navigation */
    .mobile-toggle { display: block; }

    .nav-menu {
        position: fixed;
        top: var(--header-h);
        left: 0; right: 0;
        background: var(--paper);
        border-bottom: 1px solid var(--line);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 12px 24px 24px;
        transform: translateY(-8px);
        opacity: 0;
        visibility: hidden;
        transition-property: transform, opacity, visibility;
        transition-duration: 240ms;
        transition-timing-function: var(--ease);
    }
    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .nav-link {
        padding: 14px 0;
        font-size: 1.05rem;
        border-bottom: 1px solid var(--line-soft);
    }
    .nav-cta { margin-top: 18px; }
}

@media (max-width: 520px) {
    .container { padding: 0 18px; }
    .logo img { height: 42px; }
    .ledger { padding: 20px 16px 16px; }
    .ledger-name { display: none; }
    .ledger-table td.num { font-size: 0.78rem; }
    .checklist { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; gap: 0; }
    .hero-actions .btn { width: 100%; }
    .tabs { flex-direction: column; border-bottom: none; gap: 4px; }
    .tab { text-align: left; border-left: 2px solid transparent; border-bottom: none; margin-bottom: 0; }
    .tab[aria-selected="true"] { border-left-color: #5FBF92; border-bottom-color: transparent; background: rgba(95, 191, 146, 0.08); }
    .footer-grid { grid-template-columns: 1fr; }
}