/* ---------------------------------------------------------------
   THE BLACK ARCHIVE RESEARCH — MAIN STYLESHEET
   Approved design v4. Do not alter without sign-off.
--------------------------------------------------------------- */

/* RESET & BASE */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg:           #0f0f0f;
    --bg-card:      #0f0f0f;
    --bg-field:     #191917;
    --bg-field-focus: #1e1e1c;
    --bg-btn:       #1e1e1c;
    --bg-btn-hover: #282824;
    --bg-nav-cta:   #1a1a18;

    --border-0:     #1e1e1e;
    --border-1:     #282828;
    --border-2:     #2e2e2e;
    --border-3:     #3a3836;
    --border-btn:   #8a8880;
    --border-field: #3a3836;
    --border-focus: #7a7870;
    --border-grid:  #222222;

    --text-head:    #e8e4da;
    --text-sub:     #c0bdb2;
    --text-body:    #a8a49a;
    --text-muted:   #7a7870;
    --text-dim:     #6a6860;
    --text-ghost:   #5a5850;
    --text-faint:   #4e4c48;
    --text-deep:    #3a3836;

    --text-nav:     #9a9890;
    --text-nav-hover: #d4d0c8;
    --text-btn:     #e2ddd4;
    --text-btn-hover: #f0ece4;
    --text-field:   #c0bdb4;
    --text-placeholder: #3e3c38;

    --text-ft-name: #9a9890;
    --text-ft-desc: #6a6860;
    --text-ft-led:  #5a5850;
    --text-ft-link: #6a6860;
    --text-ft-sec:  #3a3836;

    --font-mono:    'JetBrains Mono', 'Courier New', monospace;
    --font-serif:   'Cormorant Garamond', Georgia, serif;

    --pad-page:     3rem;
    --pad-section:  3.5rem;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-mono);
    background-color: var(--bg);
    color: var(--text-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: var(--font-mono); }

/* ---------------------------------------------------------------
   SKIP LINK
--------------------------------------------------------------- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    background: var(--bg-btn);
    color: var(--text-btn);
    padding: 0.5rem 1rem;
    font-size: 12px;
    z-index: 9999;
    border: 1px solid var(--border-btn);
}
.skip-link:focus { top: 1rem; }

/* ---------------------------------------------------------------
   NAVIGATION
--------------------------------------------------------------- */
.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.4rem var(--pad-page);
    border-bottom: 0.5px solid var(--border-2);
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--bg);
}

.nav-logo-name {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--text-head);
    text-transform: uppercase;
    display: block;
}

.nav-logo-sub {
    font-size: 9px;
    letter-spacing: 0.14em;
    color: var(--text-dim);
    text-transform: uppercase;
    margin-top: 3px;
    display: block;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-nav);
    transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible { color: var(--text-nav-hover); }

.nav-cta {
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-btn);
    border: 0.5px solid var(--text-muted);
    padding: 0.6rem 1.25rem;
    background: var(--bg-nav-cta);
    transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.nav-cta:hover,
.nav-cta:focus-visible {
    border-color: var(--text-nav-hover);
    color: var(--text-btn-hover);
    background: #222220;
}

.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    padding: 0.25rem;
    cursor: pointer;
}

.nav-hamburger span {
    display: block;
    width: 22px;
    height: 1px;
    background: var(--text-nav);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ---------------------------------------------------------------
   HERO
--------------------------------------------------------------- */
.site-hero {
    padding: 5rem var(--pad-page) 4.5rem;
    border-bottom: 0.5px solid var(--border-0);
    max-width: 960px;
}

.hero-service-line {
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--text-muted);
    text-transform: uppercase;
    line-height: 1.8;
    margin-bottom: 2.25rem;
    padding-bottom: 2.25rem;
    border-bottom: 0.5px solid #282828;
}

.hero-service-line strong {
    color: #b0ada4;
    font-weight: 400;
}

.hero-headline {
    font-family: var(--font-serif);
    font-size: clamp(36px, 5vw, 52px);
    font-weight: 400;
    line-height: 1.1;
    color: var(--text-head);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.hero-headline em {
    font-style: italic;
    color: var(--text-sub);
}

.hero-standfirst {
    font-family: var(--font-serif);
    font-size: clamp(16px, 2vw, 18px);
    font-weight: 400;
    line-height: 1.65;
    color: var(--text-dim);
    max-width: 560px;
    margin-bottom: 3rem;
}

.cta-group {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.btn-primary {
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-btn);
    background: var(--bg-btn);
    border: 1px solid var(--border-btn);
    padding: 0.9rem 2rem;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--bg-btn-hover);
    border-color: var(--text-sub);
    color: var(--text-btn-hover);
}

.btn-ghost {
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-dim);
    background: none;
    border: none;
    transition: color 0.15s ease;
}

.btn-ghost:hover,
.btn-ghost:focus-visible { color: var(--text-sub); }

/* ---------------------------------------------------------------
   SECTION SHARED
--------------------------------------------------------------- */
.site-section {
    padding: var(--pad-section) var(--pad-page);
    border-bottom: 0.5px solid var(--border-0);
}

.section-label {
    font-size: 9px;
    letter-spacing: 0.32em;
    color: var(--text-ghost);
    text-transform: uppercase;
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-label::before {
    content: '';
    display: block;
    width: 20px;
    height: 0.5px;
    background: var(--text-faint);
    flex-shrink: 0;
}

/* ---------------------------------------------------------------
   METHOD GRID
--------------------------------------------------------------- */
.method-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border: 0.5px solid var(--border-1);
}

.method-item {
    padding: 2rem;
    border-right: 0.5px solid var(--border-1);
}

.method-item:last-child { border-right: none; }

.method-num {
    font-size: 9px;
    letter-spacing: 0.2em;
    color: var(--text-faint);
    margin-bottom: 1rem;
    display: block;
}

.method-title {
    font-family: var(--font-serif);
    font-size: 17px;
    font-weight: 500;
    color: #d4d0c8;
    margin-bottom: 0.75rem;
}

.method-body {
    font-size: 11px;
    line-height: 1.75;
    color: var(--text-dim);
}

/* ---------------------------------------------------------------
   CASE FILES / PUBLIC EVIDENCE AUDITS
--------------------------------------------------------------- */
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border-grid);
    border: 0.5px solid var(--border-grid);
}

.case-card {
    background: var(--bg-card);
    padding: 2rem;
}

.case-id {
    font-size: 9px;
    letter-spacing: 0.25em;
    color: var(--text-faint);
    margin-bottom: 1.5rem;
    display: block;
    text-transform: uppercase;
}

.case-title {
    font-family: var(--font-serif);
    font-size: 20px;
    font-weight: 400;
    color: #c8c5bc;
    line-height: 1.2;
    margin-bottom: 0.4rem;
}

.case-period {
    font-size: 9px;
    letter-spacing: 0.1em;
    color: var(--text-deep);
    margin-bottom: 1.5rem;
    display: block;
}

.case-status {
    font-size: 9px;
    letter-spacing: 0.18em;
    color: var(--text-ghost);
    padding-top: 1.5rem;
    border-top: 0.5px solid #252525;
    text-transform: uppercase;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.case-verdict { color: var(--text-muted); }

/* ---------------------------------------------------------------
   SERVICES GRID
--------------------------------------------------------------- */
.services-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border-grid);
    border: 0.5px solid var(--border-grid);
}

.service-item {
    background: var(--bg-card);
    padding: 2rem;
}

.service-title {
    font-family: var(--font-serif);
    font-size: 17px;
    font-weight: 500;
    color: #c8c5bc;
    margin-bottom: 0.75rem;
}

.service-body {
    font-size: 11px;
    line-height: 1.75;
    color: var(--text-dim);
}

/* ---------------------------------------------------------------
   ENQUIRY SECTION
--------------------------------------------------------------- */
.enquiry-section {
    padding: var(--pad-section) var(--pad-page);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    border-bottom: 0.5px solid var(--border-0);
    align-items: start;
}

.enquiry-heading {
    font-family: var(--font-serif);
    font-size: 30px;
    font-weight: 400;
    color: #dedad2;
    line-height: 1.2;
    margin-bottom: 1.25rem;
}

.enquiry-body {
    font-size: 11px;
    line-height: 1.85;
    color: var(--text-muted);
    margin-bottom: 0.85rem;
}

.enquiry-note {
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--text-ghost);
    margin-top: 1.75rem;
    padding-top: 1.5rem;
    border-top: 0.5px solid #252525;
    line-height: 1.8;
}

/* SUCCESS / ERROR MESSAGES */
.form-message {
    font-size: 11px;
    letter-spacing: 0.1em;
    padding: 0.85rem 1rem;
    margin-bottom: 1.25rem;
    border: 0.5px solid;
}

.form-message--success {
    color: #8ab08a;
    border-color: #3a5a3a;
    background: #111a11;
}

.form-message--error {
    color: #b08a8a;
    border-color: #5a3a3a;
    background: #1a1111;
}

/* ---------------------------------------------------------------
   ENQUIRY FORM
--------------------------------------------------------------- */
.enquiry-form { display: flex; flex-direction: column; gap: 1.1rem; }

.form-field { display: flex; flex-direction: column; gap: 0.4rem; }

.form-label {
    font-size: 9px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--text-dim);
}

.form-input,
.form-select,
.form-textarea {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-color: var(--bg-field);
    border: 0.5px solid var(--border-field);
    color: var(--text-field);
    padding: 0.75rem 1rem;
    font-family: var(--font-mono);
    font-size: 11px;
    outline: none;
    width: 100%;
    border-radius: 0;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-placeholder);
    font-family: var(--font-mono);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--border-focus);
    background-color: var(--bg-field-focus);
}

.form-select { color: var(--text-dim); cursor: pointer; }
.form-select:focus { color: var(--text-field); }
.form-select option { background-color: #191917; color: var(--text-field); }

.form-textarea { resize: vertical; min-height: 88px; }

.form-submit {
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-btn);
    background: var(--bg-btn);
    border: 1px solid var(--border-btn);
    padding: 0.9rem;
    width: 100%;
    margin-top: 0.25rem;
    -webkit-appearance: none;
    appearance: none;
    border-radius: 0;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.form-submit:hover,
.form-submit:focus-visible {
    background: var(--bg-btn-hover);
    border-color: var(--text-sub);
    color: var(--text-btn-hover);
}

/* ---------------------------------------------------------------
   FOOTER
--------------------------------------------------------------- */
.site-footer {
    padding: 2.5rem var(--pad-page);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 3rem;
    border-top: 0.5px solid var(--border-1);
    flex-wrap: wrap;
}

.footer-identity { display: flex; flex-direction: column; gap: 5px; }

.footer-name {
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-ft-name);
    font-weight: 500;
}

.footer-desc {
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--text-ft-desc);
}

.footer-led {
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--text-ft-led);
    margin-top: 0.5rem;
}

.footer-spacer { flex: 1; }

.footer-nav {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    text-align: right;
}

.footer-nav a {
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-ft-link);
    transition: color 0.15s ease;
}

.footer-nav a:hover,
.footer-nav a:focus-visible { color: var(--text-body); }

.footer-secondary {
    font-size: 9px;
    letter-spacing: 0.08em;
    color: var(--text-ft-sec);
    margin-top: 0.5rem;
    display: block;
}

.footer-copy {
    font-size: 9px;
    letter-spacing: 0.08em;
    color: var(--text-ft-sec);
    align-self: flex-end;
}

/* ---------------------------------------------------------------
   RESPONSIVE — TABLET (max 900px)
--------------------------------------------------------------- */
@media ( max-width: 900px ) {
    :root { --pad-page: 2rem; }

    .nav-links,
    .nav-cta { display: none; }

    .nav-hamburger { display: flex; }

    .nav-mobile-menu {
        display: none;
        flex-direction: column;
        gap: 0;
        background: var(--bg);
        border-bottom: 0.5px solid var(--border-2);
    }

    .nav-mobile-menu.is-open { display: flex; }

    .nav-mobile-menu a {
        font-size: 11px;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--text-nav);
        padding: 1rem 2rem;
        border-bottom: 0.5px solid var(--border-0);
        display: block;
    }

    .method-grid {
        grid-template-columns: 1fr;
    }
    .method-item { border-right: none; border-bottom: 0.5px solid var(--border-1); }
    .method-item:last-child { border-bottom: none; }

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

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

    .enquiry-section { grid-template-columns: 1fr; gap: 3rem; }

    .site-footer { flex-direction: column; gap: 2rem; }
    .footer-nav { text-align: left; }
    .footer-spacer { display: none; }
    .footer-copy { align-self: flex-start; }
}

/* ---------------------------------------------------------------
   RESPONSIVE — MOBILE (max 600px)
--------------------------------------------------------------- */
@media ( max-width: 600px ) {
    :root { --pad-page: 1.25rem; --pad-section: 2.5rem; }

    .hero-headline { font-size: 32px; }
    .hero-standfirst { font-size: 16px; }

    .cta-group { flex-direction: column; align-items: flex-start; gap: 1rem; }
    .btn-primary { width: 100%; text-align: center; }

    .case-status { flex-direction: column; align-items: flex-start; gap: 0.4rem; }
}

/* ---------------------------------------------------------------
   REDUCED MOTION
--------------------------------------------------------------- */
@media ( prefers-reduced-motion: reduce ) {
    *, *::before, *::after { transition: none !important; animation: none !important; }
    html { scroll-behavior: auto; }
}

/* ---------------------------------------------------------------
   FOCUS VISIBLE
--------------------------------------------------------------- */
:focus-visible {
    outline: 1px solid var(--border-btn);
    outline-offset: 2px;
}