/* ============================================
   Research Publications — Stylesheet
   Modern, clean, system-like design
   ============================================ */

/* ===== CSS Variables ===== */
:root {
    /* Brand colors — kept as primary */
    --indigo: #2d2a6e;
    --indigo-light: #4a47a3;
    --indigo-soft: #e8e7f5;
    --indigo-tint: #f3f2fa;
    --terracotta: #a8321f;
    --terracotta-light: #c75a48;

    /* Neutral background palette — light, modern */
    --bg: #ffffff;
    --bg-soft: #f7f8fa;
    --bg-section: #fafafa;
    --paper: #ffffff;

    /* Text colors */
    --ink: #1a1a2e;
    --ink-soft: #2d2d44;
    --ink-muted: #5a5a72;
    --ink-faint: #8a8aa0;

    /* Lines & borders */
    --line: #e4e4ec;
    --line-strong: #d0d0dc;
    --line-faint: #f0f0f5;

    /* Layout */
    --container: 1200px;
    --container-narrow: 1000px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --transition: 200ms ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 17px;
    line-height: 1.65;
    color: var(--ink);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--indigo);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--indigo-light);
}

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

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: -0.01em;
    color: var(--ink);
}

p {
    margin-bottom: 1rem;
}
p:last-child {
    margin-bottom: 0;
}

.accent {
    color: var(--terracotta);
    font-style: italic;
}

.eyebrow {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--indigo);
}

.section-kicker {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--indigo);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--indigo);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.75rem;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--indigo);
    color: var(--paper);
    border-color: var(--indigo);
}
.btn-primary:hover:not(:disabled) {
    background: var(--indigo-light);
    border-color: var(--indigo-light);
    color: var(--paper);
}
.btn-primary:disabled {
    background: var(--ink-faint);
    border-color: var(--ink-faint);
    cursor: not-allowed;
}

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

.btn-block {
    display: flex;
    width: 100%;
}

.btn-sm {
    padding: 0.6rem 1.25rem;
    font-size: 0.9rem;
}

/* ===== Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.1rem;
    padding-bottom: 1.1rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    color: var(--ink);
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--indigo);
    color: var(--paper);
    font-weight: 700;
    font-size: 0.95rem;
    border-radius: 8px;
    letter-spacing: -0.02em;
}
.brand-dot {
    color: var(--terracotta-light);
    margin: 0 1px;
}

.brand-text {
    font-weight: 600;
    font-size: 1.05rem;
    letter-spacing: -0.01em;
}

.nav-desktop {
    display: flex;
    gap: 2rem;
}
.nav-desktop a {
    color: var(--ink-soft);
    font-weight: 500;
    font-size: 0.95rem;
}
.nav-desktop a:hover {
    color: var(--indigo);
}

.nav-cta {
    /* override to be slightly tighter */
}

@media (max-width: 720px) {
    .nav-desktop { display: none; }
}

/* ===== Hero ===== */
.hero {
    padding: 5rem 0 3rem;
    background: linear-gradient(180deg, var(--bg-soft) 0%, var(--bg) 100%);
}

.hero-inner {
    max-width: var(--container-narrow);
    text-align: center;
    margin: 0 auto;
}

.hero-meta {
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: clamp(2.4rem, 5vw, 3.75rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.025em;
}

.hero-lede {
    font-size: 1.2rem;
    line-height: 1.6;
    color: var(--ink-muted);
    max-width: 700px;
    margin: 0 auto;
}

/* ===== Service tiles (Above the fold) ===== */
.service-tiles-wrap {
    margin-top: 4rem;
    max-width: var(--container);
}

.service-tiles {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

@media (max-width: 980px) {
    .service-tiles { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 540px) {
    .service-tiles { grid-template-columns: 1fr; }
}

.service-tile {
    display: flex;
    flex-direction: column;
    background: var(--paper);
    border: 2px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 1.75rem 1.5rem;
    color: var(--ink);
    transition: var(--transition);
    text-align: left;
}
.service-tile:hover {
    border-color: var(--indigo);
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(45, 42, 110, 0.08);
}

.tile-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--ink);
    line-height: 1.35;
}

.tile-desc {
    font-size: 0.95rem;
    color: var(--ink-muted);
    line-height: 1.55;
    flex: 1;
    margin-bottom: 1rem;
}

.tile-link {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--indigo);
}

.service-tiles-note {
    text-align: center;
    margin-top: 2rem;
    font-size: 1rem;
    color: var(--ink-muted);
}

/* ===== Sections ===== */
.section {
    padding: 5rem 0;
}

.section-about,
.section-process {
    background: var(--bg);
}

.section-services-detail,
.section-why,
.section-contact {
    background: var(--bg-soft);
}

.section-header {
    margin-bottom: 2.5rem;
}

.section-title {
    font-size: clamp(1.75rem, 3.5vw, 2.4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

/* ===== About ===== */
.about-grid {
    display: grid;
    grid-template-columns: 5fr 6fr;
    gap: 3rem;
    align-items: start;
}

@media (max-width: 880px) {
    .about-grid { grid-template-columns: 1fr; gap: 1.5rem; }
}

.about-title {
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.015em;
}

.about-body {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--ink-soft);
}

.value-list {
    list-style: none;
    margin-top: 2rem;
}

.value-list li {
    display: flex;
    gap: 0.85rem;
    padding: 0.85rem 0;
    border-top: 1px solid var(--line);
}
.value-list li:last-child {
    border-bottom: 1px solid var(--line);
}

.value-mark {
    color: var(--indigo);
    font-weight: 700;
    flex-shrink: 0;
}

.value-list strong {
    color: var(--ink);
    display: block;
    margin-bottom: 0.15rem;
}

/* ===== Service detail sections ===== */
.section-services-detail .container > .section-header,
.section-services-detail .container > .section-title {
    /* let the wrapper container stay normal */
}

.service-section {
    background: var(--paper);
    padding: 4rem 0;
    border-top: 1px solid var(--line);
}

.service-section-alt {
    background: var(--bg-soft);
}

.service-section:first-of-type {
    border-top: 2px solid var(--line);
    margin-top: 2rem;
}

.service-section-inner {
    display: grid;
    grid-template-columns: 6fr 5fr;
    gap: 3.5rem;
    align-items: start;
}

@media (max-width: 980px) {
    .service-section-inner {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

.service-content {
    /* width managed by grid */
}

.service-heading {
    font-size: clamp(1.6rem, 3vw, 2rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.service-lede {
    font-size: 1.15rem;
    color: var(--indigo);
    font-weight: 500;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.service-text {
    font-size: 1.02rem;
    line-height: 1.7;
    color: var(--ink-soft);
    margin-bottom: 1.5rem;
}

.service-text p {
    margin-bottom: 1rem;
}

.service-bullets {
    list-style: none;
    padding: 1.25rem;
    background: var(--indigo-tint);
    border-radius: var(--radius-md);
    border: 1px solid var(--indigo-soft);
}

.service-bullets li {
    position: relative;
    padding-left: 1.5rem;
    padding-block: 0.4rem;
    color: var(--ink-soft);
    font-size: 0.98rem;
}

.service-bullets li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--indigo);
    font-weight: 700;
}

/* ===== Service form (in service section) ===== */
.service-form-wrap {
    position: sticky;
    top: 100px;
}

.service-form {
    background: var(--paper);
    border: 2px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.service-section-alt .service-form {
    border-color: var(--line-strong);
}

.form-heading {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--ink);
}

/* ===== Forms (shared) ===== */
.contact-form .field {
    margin-bottom: 1.1rem;
}

.contact-form label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--ink-soft);
    margin-bottom: 0.4rem;
}

.contact-form .req {
    color: var(--terracotta);
    margin-left: 2px;
}

.contact-form .optional {
    color: var(--ink-faint);
    font-weight: 400;
    font-size: 0.85rem;
    margin-left: 2px;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form input[type="tel"],
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 0.7rem 0.85rem;
    font-family: inherit;
    font-size: 1rem;
    color: var(--ink);
    background: var(--paper);
    border: 1.5px solid var(--line-strong);
    border-radius: var(--radius-sm);
    outline: none;
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    border-color: var(--indigo);
    box-shadow: 0 0 0 3px var(--indigo-soft);
}

.contact-form textarea {
    resize: vertical;
    min-height: 80px;
    font-family: inherit;
    line-height: 1.55;
}

.contact-form-general textarea {
    min-height: 140px;
}

.contact-form 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='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%235a5a72' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.85rem center;
    padding-right: 2rem;
}

.form-status {
    margin-top: 1rem;
    padding: 0;
    font-size: 0.95rem;
    line-height: 1.5;
    text-align: center;
    transition: all 250ms ease;
}
.form-status:empty {
    margin-top: 0;
}
.form-status-loading {
    color: var(--ink-muted);
    padding: 0.75rem;
}
.form-status-success {
    color: #2d5f3f;
    background: #e8f5ee;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid #c5e3d2;
}
.form-status-error {
    color: #8a2222;
    background: #fbecec;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid #e8c5c5;
}

.form-note {
    font-size: 0.85rem;
    color: var(--ink-muted);
    margin-top: 1rem;
    line-height: 1.5;
}

.hidden-field {
    position: absolute !important;
    left: -9999px !important;
    width: 1px !important;
    height: 1px !important;
    overflow: hidden !important;
    opacity: 0 !important;
    pointer-events: none !important;
}

/* ===== Process ===== */
.process-steps {
    list-style: none;
    counter-reset: step;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

@media (max-width: 980px) {
    .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 540px) {
    .process-steps { grid-template-columns: 1fr; }
}

.process-step {
    background: var(--paper);
    border: 2px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: var(--transition);
}
.process-step:hover {
    border-color: var(--indigo);
    transform: translateY(-3px);
}

.step-num {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--indigo);
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
}

.step-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--ink);
}

.process-step p {
    font-size: 0.95rem;
    color: var(--ink-muted);
    line-height: 1.6;
}

/* ===== Why ===== */
.why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

@media (max-width: 980px) {
    .why-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 540px) {
    .why-grid { grid-template-columns: 1fr; }
}

.why-card {
    background: var(--paper);
    border: 2px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 1.75rem 1.5rem;
    transition: var(--transition);
}
.why-card:hover {
    border-color: var(--indigo);
    transform: translateY(-3px);
}

.why-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--indigo-tint);
    color: var(--indigo);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
}
.why-icon svg {
    width: 24px;
    height: 24px;
}

.why-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.why-card p {
    font-size: 0.95rem;
    color: var(--ink-muted);
    line-height: 1.6;
}

/* ===== Contact (general) ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 5fr 6fr;
    gap: 3rem;
    align-items: start;
}

@media (max-width: 880px) {
    .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
}

.contact-intro {
    /* width managed by grid */
}

.contact-intro .section-title {
    margin-bottom: 1.25rem;
}

.contact-intro p {
    font-size: 1.05rem;
    line-height: 1.65;
    color: var(--ink-soft);
    margin-bottom: 1rem;
}

.contact-direct {
    margin: 2rem 0 1rem;
    padding: 1.25rem;
    background: var(--paper);
    border: 2px solid var(--line);
    border-radius: var(--radius-md);
}

.contact-label {
    display: block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    color: var(--indigo);
    margin-bottom: 0.4rem;
}

.contact-email {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--ink);
    border-bottom: 2px solid var(--indigo-soft);
    padding-bottom: 1px;
}
.contact-email:hover {
    color: var(--indigo);
    border-color: var(--indigo);
}

.contact-discreet {
    color: var(--ink-faint);
    font-size: 0.95rem;
    margin-top: 1rem;
}

.contact-form-general {
    background: var(--paper);
    border: 2px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

/* ===== Footer ===== */
.site-footer {
    background: var(--ink);
    color: rgba(255,255,255,0.85);
    padding: 3rem 0 2rem;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1.5rem;
    align-items: center;
}

@media (max-width: 720px) {
    .footer-inner { grid-template-columns: 1fr; text-align: left; }
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.footer-brand .brand-mark {
    /* keep same as header */
}

.footer-tagline {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.7);
}

.footer-meta {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
    text-align: right;
}

@media (max-width: 720px) {
    .footer-meta { text-align: left; }
}

.footer-meta a {
    color: rgba(255,255,255,0.85);
}
.footer-meta a:hover {
    color: var(--paper);
}

.footer-legal {
    grid-column: 1 / -1;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 0.82rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.6;
    text-align: center;
}
.footer-legal a {
    color: rgba(255,255,255,0.7);
    border-bottom: 1px solid rgba(255,255,255,0.18);
    padding-bottom: 1px;
}
.footer-legal a:hover {
    color: var(--paper);
    border-bottom-color: rgba(255,255,255,0.4);
}

/* ===== Reveal-on-scroll ===== */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 700ms ease, transform 700ms ease;
}
.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

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