/* === CSS Variables & Themes === */
:root {
    --bg-color: #f4f4f5;
    --bg-grid: #e2e8f0;
    --surface-color: #ffffff;
    --text-color: #18181b;
    --text-muted: #71717a;
    --border-color: #d4d4d8;
    --border-heavy: #18181b;
    --primary-color: #ea580c;
    --accent-color: #0f172a;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #09090b;
        --bg-grid: #18181b;
        --surface-color: #18181b;
        --text-color: #f4f4f5;
        --text-muted: #a1a1aa;
        --border-color: #27272a;
        --border-heavy: #3f3f46;
        --accent-color: #f4f4f5;
    }
}

body.light-theme {
    --bg-color: #f4f4f5;
    --bg-grid: #e2e8f0;
    --surface-color: #ffffff;
    --text-color: #18181b;
    --text-muted: #71717a;
    --border-color: #d4d4d8;
    --border-heavy: #18181b;
    --accent-color: #0f172a;
}

body.dark-theme {
    --bg-color: #09090b;
    --bg-grid: #18181b;
    --surface-color: #18181b;
    --text-color: #f4f4f5;
    --text-muted: #a1a1aa;
    --border-color: #27272a;
    --border-heavy: #3f3f46;
    --accent-color: #f4f4f5;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    background-image:
        linear-gradient(var(--bg-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
    background-size: 40px 40px;
    line-height: 1.6;
    font-size: 16px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* === Typography === */
h1 { font-size: clamp(2rem, 6vw, 3.5rem); font-weight: 900; letter-spacing: -0.03em; line-height: 1.1; }
h2 { font-size: clamp(1.5rem, 4vw, 2.2rem); font-weight: 900; letter-spacing: -0.02em; line-height: 1.15; }
h3 { font-size: 1.15rem; font-weight: 700; line-height: 1.3; }
h4 { font-size: 1rem; font-weight: 700; line-height: 1.3; }

.mono {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
}

.text-caps { text-transform: uppercase; }

/* === Header & Nav === */
.header {
    background: var(--surface-color);
    border-bottom: 2px solid var(--border-heavy);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 800;
    font-size: 0.95rem;
    color: var(--text-color);
    text-decoration: none;
    white-space: nowrap;
}

.nav-list {
    display: flex;
    gap: 24px;
    list-style: none;
    align-items: center;
}

.nav-list a, .nav-list button {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 6px 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

#theme-toggle:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.lang-toggle {
    display: inline-block;
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 6px 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    text-decoration: none;
    line-height: 1;
}

.lang-toggle:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.lang-toggle .lang-active {
    color: var(--text-color);
    font-weight: 800;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 12px 24px;
    background: var(--accent-color);
    color: var(--bg-color);
    text-decoration: none;
    font-weight: 800;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'JetBrains Mono', monospace;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(234, 88, 12, 0.35);
}

.btn:hover {
    transform: translateY(-1px);
    opacity: 0.9;
}

/* === Page Label === */
.page-label {
    display: inline-block;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 4px 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

/* === Section === */
.section {
    padding: 80px 0;
}

.section-alt {
    padding: 80px 0;
    background: var(--surface-color);
}

/* === Hero === */
.hero {
    padding: 100px 0 80px;
}

.hero-title {
    text-transform: uppercase;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.5;
    max-width: 680px;
    padding-left: 20px;
    border-left: 4px solid var(--primary-color);
    color: var(--text-color);
    margin-bottom: 16px;
}

.hero-cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* === Case Group Title === */
.case-group-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin: 60px 0 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.case-group-title:first-of-type {
    margin-top: 0;
}

/* === Case Item === */
.case-item {
    display: flex;
    background: var(--surface-color);
    border: 1px solid var(--border-heavy);
    margin-bottom: 16px;
}

.case-id-sidebar {
    background: var(--accent-color);
    color: var(--bg-color);
    width: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    flex-shrink: 0;
    text-transform: uppercase;
    padding: 20px 0;
}

.case-content {
    padding: 32px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.case-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.case-description {
    color: var(--text-muted);
    line-height: 1.6;
    font-size: 0.95rem;
}

.case-status-stamp {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 4px 12px;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 800;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    white-space: nowrap;
    flex-shrink: 0;
}

/* === Specs Table === */
.case-specs-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
    margin-top: 20px;
}

.spec-cell {
    background: var(--surface-color);
    padding: 14px 16px;
}

.spec-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 4px;
}

.spec-value {
    font-weight: 700;
    font-size: 0.85rem;
}

/* === Featured Case === */
.featured-special {
    border-width: 2px;
    border-color: var(--primary-color);
}

.featured-special .case-id-sidebar {
    background: var(--primary-color);
    color: #fff;
}

/* === Archive Item === */
.archive-item {
    opacity: 0.5;
}

/* === Tier Section === */
.tier-section {
    background: var(--accent-color);
    color: var(--bg-color);
    padding: 80px 0;
}

.tier-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 60px;
    margin-top: 40px;
}

.tier-card {
    border-top: 2px solid var(--primary-color);
    padding-top: 20px;
}

.tier-card p { color: var(--bg-color); opacity: 0.7; }

.tier-price {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

/* === Team Grid === */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

.team-card {
    padding: 32px;
    border: 1px solid var(--border-heavy);
    background: var(--surface-color);
}

.team-name {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.team-bio p {
    color: var(--text-muted);
    line-height: 1.6;
}

/* === Tech Radar === */
.radar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.radar-group {
    padding: 24px;
    border: 1px solid var(--border-heavy);
    background: var(--surface-color);
}

.radar-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 12px;
}

.radar-group ul {
    padding: 0;
}

.radar-group li {
    line-height: 2;
}

/* === Footer === */
.footer {
    padding: 60px 0;
}

/* === Forms === */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-color);
    border: 1px solid var(--border-heavy);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

/* === Accordion (services + FAQ) === */
.accordion {
    border-top: 1px solid var(--border-heavy);
}

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

.accordion-head {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: none;
    border: none;
    color: var(--text-color);
    padding: 24px 28px;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
}

.accordion-head:hover { background: var(--bg-color); }

.accordion-head h3 {
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: -0.01em;
}

.accordion-kicker {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: var(--primary-color);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-right: 16px;
    flex-shrink: 0;
    min-width: 44px;
}

.accordion-toggle {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.3rem;
    color: var(--primary-color);
    line-height: 1;
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.accordion-item.open .accordion-toggle { transform: rotate(45deg); }

.accordion-body {
    display: none;
    padding: 0 28px 28px 28px;
    color: var(--text-muted);
    line-height: 1.6;
}

.accordion-item.open .accordion-body { display: block; }

.accordion-body p { margin-bottom: 12px; }
.accordion-body .btn { margin-top: 8px; }

/* === FAQ legacy (fallback) === */
.faq-item {
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.faq-item h3 {
    margin-bottom: 8px;
}

.faq-item p {
    color: var(--text-muted);
    line-height: 1.6;
}

/* === Card Grid (services index, industry) === */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.card-grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    padding: 28px;
    border: 1px solid var(--border-heavy);
    background: var(--surface-color);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 8px;
}

.card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* === Contact Layout === */
.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
}

/* === Mono List (bullet lists in mono style) === */
.mono-list {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 2.2;
}

.mono-list-alt {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 2.2;
    padding: 28px;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
}

/* === Spec Box (result/audience grids) === */
.spec-box {
    padding: 32px;
    border: 1px solid var(--border-heavy);
    background: var(--surface-color);
}

.spec-box-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 28px;
}

.tag-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.tag-cell {
    padding: 16px;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
}

/* === Quick Option Links (contact page) === */
.quick-link {
    display: block;
    padding: 20px;
    border: 1px solid var(--border-heavy);
    background: var(--surface-color);
    text-decoration: none;
    color: var(--text-color);
    margin-bottom: 12px;
    transition: border-color 0.2s;
}

.quick-link:hover {
    border-color: var(--primary-color);
}

.contact-link-block {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-color);
}

/* === Team compact (with modal trigger) === */
.team-card-compact {
    padding: 24px;
    border: 1px solid var(--border-heavy);
    background: var(--surface-color);
    cursor: pointer;
    transition: border-color 0.2s, transform 0.2s;
    text-align: left;
    width: 100%;
    font-family: inherit;
    color: var(--text-color);
}

.team-card-compact:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.team-card-compact .team-name {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.team-card-compact .team-role {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.team-card-compact .team-more {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    color: var(--text-muted);
    margin-top: 16px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* === Modal === */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal-backdrop.open { display: flex; }

.modal-card {
    background: var(--surface-color);
    border: 1px solid var(--border-heavy);
    max-width: 640px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 40px;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    cursor: pointer;
    padding: 4px 10px;
}

.modal-close:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.modal-card h3 {
    font-size: 1.4rem;
    margin-bottom: 6px;
}

.modal-role {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

.modal-card p {
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 14px;
}

/* === Trigger list (for cases / с чем приходят) === */
.trigger-list {
    display: grid;
    gap: 16px;
}

.trigger-item {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
    padding: 24px;
    border: 1px solid var(--border-heavy);
    background: var(--surface-color);
}

.trigger-cell .spec-label { margin-bottom: 8px; }
.trigger-cell p { font-size: 0.95rem; line-height: 1.5; }
.trigger-cell blockquote {
    font-style: italic;
    color: var(--text-muted);
    border-left: 3px solid var(--primary-color);
    padding-left: 14px;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* === Simple contact form (single-field) === */
.contact-simple {
    max-width: 600px;
    margin: 0 auto;
}

.contact-simple .form-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.contact-simple .form-row .form-input { flex: 1; min-width: 180px; }

/* === Responsive === */
@media (max-width: 768px) {
    .section, .section-alt { padding: 50px 0; }
    .hero { padding: 60px 0 40px; }

    .case-item { flex-direction: column; }
    .case-id-sidebar {
        width: 100%;
        min-height: auto;
        height: 32px;
        writing-mode: horizontal-tb;
        transform: none;
    }

    .nav-list { gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
    #theme-toggle { display: none; }

    .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .tier-grid { gap: 30px; }
    .team-grid { grid-template-columns: 1fr; }

    .case-content { padding: 20px; }
    .case-specs-table { grid-template-columns: 1fr; }

    .card-grid, .card-grid-4 { grid-template-columns: 1fr; }

    .trigger-item { grid-template-columns: 1fr; gap: 14px; }
    .accordion-head { padding: 18px 20px; }
    .accordion-kicker { min-width: 38px; margin-right: 10px; }
    .accordion-body { padding: 0 20px 20px 20px; }
    .modal-card { padding: 28px 20px; }
}

@media (max-width: 480px) {
    .nav-list { gap: 8px; }
    .nav-list a, .nav-list button { font-size: 0.65rem; }
    .hero-cta { flex-direction: column; }
    .hero-cta .btn { width: 100%; text-align: center; }
    .btn { padding: 10px 16px; font-size: 0.7rem; }
}