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

:root {
    --bg: #0d1117;
    --bg-alt: #11161d;
    --panel: #161b22;
    --panel-2: #1c232c;
    --border: #21262d;
    --border-2: #30363d;
    --text: #c9d1d9;
    --text-dim: #8b949e;
    --muted: #6e7681;
    --accent: #58a6ff;
    --good: #3fb950;
    --warn: #d29922;
    --bad: #f85149;
    --sans: 'IBM Plex Sans', system-ui, sans-serif;
    --mono: 'IBM Plex Mono', 'JetBrains Mono', monospace;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    font-size: 15px;
}

h1,
h2,
h3,
h4 {
    font-family: var(--sans);
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em;
    line-height: 1.25;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

code,
.mono {
    font-family: var(--mono);
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

.page-narrow {
    max-width: 820px;
}

/* ============ TERMINAL BAR ============ */
.terminal-bar {
    background: #05080c;
    border-bottom: 1px solid var(--border);
    font-family: var(--mono);
    font-size: 0.76rem;
}

.terminal-inner {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 24px;
    color: var(--text-dim);
}

.terminal-prompt {
    color: var(--good);
    font-weight: 600;
}

.terminal-text {
    flex: 1;
}

.terminal-status {
    color: var(--good);
    font-size: 0.72rem;
    animation: blink 2s infinite;
}

@keyframes blink {
    50% {
        opacity: 0.5;
    }
}

/* ============ HEADER ============ */
.header {
    background: rgba(13, 17, 23, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 66px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--mono);
    font-size: 1.05rem;
    font-weight: 500;
}

.brand:hover {
    text-decoration: none;
}

.brand-hex {
    color: var(--accent);
    font-size: 1.3rem;
    line-height: 1;
}

.brand-name {
    color: var(--text);
}

.brand-dot {
    color: var(--accent);
}

.nav {
    display: flex;
    gap: 4px;
}

.nav a {
    color: var(--text-dim);
    font-size: 0.88rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 6px;
    transition: background .15s, color .15s;
}

.nav a:hover {
    background: var(--panel);
    color: var(--text);
    text-decoration: none;
}

.nav a.active {
    background: var(--panel-2);
    color: var(--accent);
}

.burger {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ============ HERO ============ */
.hero {
    padding: 80px 0 70px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-label {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 20px;
    letter-spacing: 0.02em;
}

.hero h1 {
    font-size: clamp(1.9rem, 4vw, 3rem);
    line-height: 1.1;
    margin-bottom: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.hero h1 .accent {
    color: var(--accent);
    font-family: var(--mono);
    font-weight: 500;
}

.hero p {
    font-size: 1rem;
    color: var(--text-dim);
    max-width: 540px;
    margin-bottom: 30px;
}

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

/* Кнопки */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 22px;
    border-radius: 8px;
    font-family: var(--sans);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background .15s, border-color .15s, color .15s;
}

.btn-primary {
    background: var(--accent);
    color: #0d1117;
    font-weight: 600;
}

.btn-primary:hover {
    background: #79b8ff;
    text-decoration: none;
    color: #0d1117;
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border-color: var(--border-2);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    text-decoration: none;
}

/* Hero formula */
.hero-formula {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    font-family: var(--mono);
}

.formula-head {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--panel-2);
}

.formula-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border-2);
}

.formula-dot:nth-child(1) {
    background: #ff5f56;
}

.formula-dot:nth-child(2) {
    background: #ffbd2e;
}

.formula-dot:nth-child(3) {
    background: #27c93f;
}

.formula-title {
    margin-left: 10px;
    font-size: 0.78rem;
    color: var(--text-dim);
}

.formula-body {
    padding: 24px;
    font-size: 1rem;
    line-height: 2;
}

.formula-line {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.f-var {
    color: var(--accent);
    font-weight: 500;
}

.f-op {
    color: var(--text-dim);
}

.f-sum {
    color: var(--warn);
    font-size: 1.2rem;
}

.f-brack {
    color: var(--text-dim);
}

.f-num {
    color: var(--good);
}

.formula-comment {
    color: var(--muted);
    font-size: 0.82rem;
    margin: 12px 0;
    line-height: 1.5;
}

/* ============ STATS BAR ============ */
.stats-bar {
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 30px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stat-label {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-family: var(--mono);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent);
}

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

.section-alt {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-head {
    margin-bottom: 44px;
    max-width: 640px;
}

.section-tag {
    display: block;
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-head h2 {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    margin-bottom: 10px;
}

.section-head p {
    color: var(--text-dim);
}

.section-cta {
    text-align: center;
    margin-top: 40px;
}

/* ============ EDGE TABLE ============ */
.edge-table {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    font-family: var(--mono);
    font-size: 0.88rem;
}

.edge-row {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr 1fr 1.2fr;
    gap: 16px;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    transition: background .15s;
}

.edge-row:last-child {
    border-bottom: none;
}

.edge-row:not(.edge-header):hover {
    background: var(--panel-2);
}

.edge-header {
    background: var(--panel-2);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
    font-weight: 500;
}

.edge-name {
    color: var(--text);
}

.edge-value {
    font-weight: 600;
}

.edge-value.good {
    color: var(--good);
}

.edge-value.mid {
    color: var(--warn);
}

.edge-value.bad {
    color: var(--bad);
}

.edge-tag {
    font-size: 0.78rem;
    color: var(--text-dim);
}

/* ============ LEGEND ============ */
.legend {
    display: flex;
    gap: 24px;
    margin-top: 20px;
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--text-dim);
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.good {
    background: var(--good);
}

.legend-dot.mid {
    background: var(--warn);
}

.legend-dot.bad {
    background: var(--bad);
}

/* ============ FILTERS ============ */
.filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.filter {
    background: var(--panel);
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 8px 16px;
    border-radius: 6px;
    font-family: var(--mono);
    font-size: 0.78rem;
    cursor: pointer;
    transition: all .15s;
}

.filter:hover {
    border-color: var(--accent);
    color: var(--text);
}

.filter.active {
    background: var(--accent);
    color: #0d1117;
    border-color: var(--accent);
    font-weight: 600;
}

/* ============ EXPLAIN GRID ============ */
.explain-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.explain-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 26px 22px;
}

.explain-num {
    font-family: var(--mono);
    font-size: 1.4rem;
    color: var(--accent);
    display: block;
    margin-bottom: 14px;
}

.explain-card h3 {
    font-size: 1rem;
    margin-bottom: 10px;
}

.explain-card p {
    color: var(--text-dim);
    font-size: 0.88rem;
}

/* ============ CALC BOX ============ */
.calc-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    font-family: var(--mono);
    font-size: 0.92rem;
}

.calc-row {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr;
    gap: 20px;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
    align-items: center;
}

.calc-row:last-child {
    border-bottom: none;
}

.calc-label {
    color: var(--text-dim);
}

.calc-eq {
    color: var(--accent);
}

.calc-val {
    color: var(--text);
    font-weight: 500;
    text-align: right;
}

.calc-highlight {
    background: rgba(88, 166, 255, 0.06);
}

.calc-highlight .calc-val {
    color: var(--good);
    font-weight: 600;
    font-size: 1.05rem;
}

/* ============ EDITORIAL ============ */
.editorial {
    padding: 80px 0;
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
}

.editorial-inner {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 60px;
    align-items: center;
}

.editorial h2 {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    margin: 12px 0 20px;
}

.editorial p {
    color: var(--text-dim);
    margin-bottom: 24px;
}

.editorial-side {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.side-item {
    background: var(--panel);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: 0 8px 8px 0;
    padding: 18px 20px;
}

.side-label {
    display: block;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.side-value {
    color: var(--text);
    font-size: 0.9rem;
}

/* ============ PAGE ============ */
.page {
    padding: 60px 0 80px;
}

.page h1 {
    font-size: clamp(1.7rem, 3.4vw, 2.5rem);
    margin: 8px 0 20px;
}

.page-lead {
    color: var(--text-dim);
    font-size: 1rem;
    margin-bottom: 32px;
    max-width: 640px;
}

.page h2 {
    font-size: 1.15rem;
    margin: 32px 0 12px;
    color: var(--text);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.page p,
.page li {
    color: var(--text-dim);
    margin-bottom: 10px;
}

.page ul {
    margin-left: 22px;
    margin-bottom: 18px;
}

.page ul li::marker {
    color: var(--accent);
}

.muted {
    color: var(--muted);
    font-family: var(--mono);
    font-size: 0.82rem;
    margin-bottom: 24px;
}

/* ============ FORMULA BLOCK ============ */
.formula-block {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px 28px;
    margin: 20px 0 24px;
    font-family: var(--mono);
    font-size: 0.95rem;
    line-height: 1.9;
}

/* ============ CALLOUT ============ */
.callout {
    display: flex;
    gap: 16px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-left: 3px solid var(--warn);
    border-radius: 0 10px 10px 0;
    padding: 20px 24px;
    margin-top: 32px;
}

.callout-icon {
    font-family: var(--mono);
    font-size: 1.2rem;
    color: var(--warn);
    font-weight: 600;
    flex-shrink: 0;
}

.callout strong {
    display: block;
    margin-bottom: 6px;
    color: var(--text);
}

.callout p {
    color: var(--text-dim);
    font-size: 0.9rem;
    margin: 0;
}

/* ============ CALCULATOR ============ */
.calc-panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-bottom: 30px;
}

.calc-input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.calc-input-group label {
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.calc-input-group input {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 12px 16px;
    border-radius: 8px;
    font-family: var(--mono);
    font-size: 0.95rem;
    transition: border-color .15s;
}

.calc-input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.calc-panel .btn {
    grid-column: 1 / -1;
    justify-self: start;
}

.calc-results {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    font-family: var(--mono);
    font-size: 0.92rem;
    margin-bottom: 24px;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

.result-row:last-child {
    border-bottom: none;
}

.result-label {
    color: var(--text-dim);
}

.result-value {
    color: var(--text);
    font-weight: 500;
}

.result-highlight {
    background: rgba(88, 166, 255, 0.06);
}

.result-highlight .result-value {
    color: var(--good);
    font-weight: 600;
    font-size: 1.05rem;
}

.calc-note {
    background: var(--panel);
    border-left: 3px solid var(--accent);
    border-radius: 0 8px 8px 0;
    padding: 20px 24px;
}

.calc-note h3 {
    font-size: 0.98rem;
    margin-bottom: 8px;
}

.calc-note p {
    color: var(--text-dim);
    font-size: 0.9rem;
}

/* ============ CONTACTS ============ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 30px 0 50px;
}

.contact-item {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 26px 22px;
}

.contact-icon {
    font-size: 1.3rem;
    color: var(--accent);
    display: block;
    margin-bottom: 14px;
    font-family: var(--mono);
}

.contact-item h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.contact-item p {
    color: var(--text-dim);
    font-size: 0.85rem;
    margin-bottom: 14px;
}

.form-title {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.15rem;
}

/* ============ FORM ============ */
.form {
    max-width: 560px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.form input,
.form textarea {
    background: var(--panel);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 13px 16px;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.92rem;
    transition: border-color .15s;
}

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

.form .btn {
    align-self: flex-start;
}

/* ============ FOOTER ============ */
.footer {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    padding: 50px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 36px;
}

.footer-desc {
    margin-top: 14px;
    font-size: 0.85rem;
    color: var(--muted);
    max-width: 260px;
}

.footer h4 {
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 14px;
    font-weight: 500;
}

.footer a {
    display: block;
    color: var(--text-dim);
    font-size: 0.88rem;
    margin-bottom: 8px;
    transition: color .15s;
}

.footer a:hover {
    color: var(--accent);
    text-decoration: none;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 20px;
    text-align: center;
    font-family: var(--mono);
    font-size: 0.76rem;
    color: var(--muted);
}

/* ============ PRIVACY MODAL ============ */
.privacy-modal {
    position: fixed;
    inset: 0;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 24px;
    animation: fadeIn .25s ease;
}

.privacy-modal.show {
    display: flex;
}

.privacy-box {
    background: var(--panel);
    border: 1px solid var(--border-2);
    border-radius: 14px;
    padding: 30px;
    max-width: 540px;
    width: 100%;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
    animation: popIn .35s cubic-bezier(0.2, 0.9, 0.3, 1.2);
    position: relative;
    font-family: var(--sans);
}

.privacy-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 30px;
    right: 30px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--good));
}

.privacy-head {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-bottom: 20px;
}

.privacy-icon {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    background: var(--bg-alt);
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 10px;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.privacy-head h3 {
    font-size: 1.1rem;
    margin-bottom: 2px;
}

.privacy-sub {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--muted);
}

.privacy-text {
    color: var(--text-dim);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

.privacy-text a {
    color: var(--accent);
    font-weight: 500;
}

.privacy-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.privacy-foot {
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--muted);
    display: flex;
    gap: 10px;
    justify-content: center;
    align-items: center;
}

.privacy-foot a {
    color: var(--muted);
}

.privacy-foot a:hover {
    color: var(--accent);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes popIn {
    from {
        transform: translateY(20px) scale(0.96);
        opacity: 0;
    }

    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

/* ============ АДАПТИВ ============ */
@media (max-width: 980px) {
    .hero-inner {
        grid-template-columns: 1fr;
    }

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

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

    .editorial-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

    .calc-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .edge-row {
        grid-template-columns: 1fr;
        gap: 4px;
        padding: 14px 18px;
    }

    .edge-row>span:not(.edge-name) {
        font-size: 0.82rem;
    }

    .edge-header {
        display: none;
    }

    .edge-row:not(.edge-header)::before {
        content: '';
        display: none;
    }

    .calc-row {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .calc-val {
        text-align: left;
    }
}

@media (max-width: 640px) {
    .terminal-inner {
        justify-content: center;
    }

    .nav {
        display: none;
    }

    .nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 66px;
        right: 24px;
        background: var(--panel);
        border: 1px solid var(--border-2);
        border-radius: 10px;
        padding: 12px;
        gap: 4px;
        min-width: 220px;
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
        z-index: 100;
    }

    .burger {
        display: block;
    }

    .hero {
        padding: 50px 0 40px;
    }

    .section {
        padding: 55px 0;
    }

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

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

    .privacy-box {
        padding: 24px 20px;
    }

    .privacy-actions {
        flex-direction: column-reverse;
    }

    .privacy-actions .btn {
        width: 100%;
        justify-content: center;
    }

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