/* ═══════════════════════════════════════════════════════════════════
   InVariants Landing Page — landing.css
   ═══════════════════════════════════════════════════════════════════ */

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

:root {
    /* ── Exact app palette ── */
    --bg:         #1e1e1e;
    --bg-sidebar: #252526;
    --bg-card:    #2d2d2d;
    --bg-card2:   #333333;
    --bg-input:   #3c3c3c;
    --accent:     #d18c4e;
    --accent-h:   #e0a06a;
    --accent-glow:rgba(209,140,78,0.25);
    --success:    #4ec9b0;
    --warning:    #dcdcaa;
    --danger:     #f44747;
    --text:       #d4d4d4;
    --text-mid:   #9d9d9d;
    --text-dim:   #6d6d6d;
    --border:     #404040;
    --radius:     8px;
    --radius-sm:  6px;
    --transition: 0.2s ease;
    --shadow:     0 8px 32px rgba(0,0,0,0.6);
    --glow:       0 0 32px rgba(209,140,78,0.2);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

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

/* ── Gradient text — amber → teal ──────────────────────────────────── */
.gradient-text {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-h) 45%, var(--success) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ── Shared section styles ─────────────────────────────────────────── */
.section-tag {
    display: block;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    font-size: .75rem;
    font-weight: 600;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--accent);
    background: rgba(209,140,78,0.1);
    border: 1px solid rgba(209,140,78,0.3);
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 18px;
}
.section-tag.light { color: var(--accent-h); background: rgba(209,140,78,0.08); border-color: rgba(209,140,78,0.2); }
.section-title { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; line-height: 1.2; margin-bottom: 16px; color: var(--text); text-align: center; }
.section-title.light { color: var(--text); }
.section-sub { font-size: 1.05rem; color: var(--text-mid); max-width: 680px; margin-bottom: 48px; text-align: center; margin-left: auto; margin-right: auto; }
.section-sub.light { color: var(--text-mid); }

/* ── Fade-in animation ─────────────────────────────────────────────── */
.mod-card, .uc-card, .tech-card, .tda-feat,
.wf-step, .vision-card, .dr-algo, .ts-item, .ml-algo {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s var(--transition), transform 0.5s var(--transition);
}
.mod-card.visible, .uc-card.visible, .tech-card.visible, .tda-feat.visible,
.wf-step.visible, .vision-card.visible, .dr-algo.visible, .ts-item.visible, .ml-algo.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ════════════════════════════════ NAVBAR ════════════════════════════════ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 14px 0;
    transition: background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
    background: rgba(30, 30, 30, 0.96);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 32px;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
}
.nav-logo i { color: var(--accent); font-size: 1.2rem; }
.nav-links-outer {
    display: flex;
    list-style: none;
    gap: 18px;
    flex: 1;
}
.nav-links-outer a {
    font-size: .83rem;
    font-weight: 500;
    color: var(--text-mid);
    white-space: nowrap;
    transition: color var(--transition);
}
.nav-links-outer a:hover { color: var(--text); }
.nav-cta { display: flex; align-items: center; gap: 8px; }
.nav-link-beta {
    color: var(--accent) !important;
    font-weight: 600 !important;
}
.nav-tools {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 14px;
}
.nav-lang-form {
    display: flex;
    align-items: center;
    gap: 10px;
}
.nav-lang-label {
    font-size: .78rem;
    font-weight: 600;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: .08em;
}
.nav-lang-select-wrap {
    position: relative;
    display: flex;
    align-items: center;
}
.nav-lang-select-wrap i {
    position: absolute;
    right: 12px;
    pointer-events: none;
    color: var(--text-dim);
    font-size: .72rem;
}
.nav-lang-select {
    appearance: none;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 9px 34px 9px 12px;
    font-size: .83rem;
    font-weight: 600;
    min-width: 130px;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.nav-lang-select:hover,
.nav-lang-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(209,140,78,0.12);
    outline: none;
}
.btn-nav-primary {
    background: var(--accent);
    color: #fff;
    padding: 8px 20px;
    border-radius: var(--radius);
    font-size: .85rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    transition: background var(--transition), box-shadow var(--transition);
}
.btn-nav-primary:hover {
    background: var(--accent-h);
    box-shadow: 0 4px 14px var(--accent-glow);
}
.nav-burger {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: auto;
}

/* ════════════════════════════════ HERO ════════════════════════════════ */
.hero {
    min-height: clamp(700px, 100vh, 920px);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    overflow: hidden;
    padding: 110px 0 0;
}
.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(209,140,78,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(209,140,78,0.05) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 30%, transparent 80%);
}
.hero-glow {
    position: absolute;
    top: -10%;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(209,140,78,0.12) 0%, transparent 70%);
    pointer-events: none;
}
.hero-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.particle {
    position: absolute;
    border-radius: 50%;
    background: var(--accent);
    animation: float-particle linear infinite;
}
@keyframes float-particle {
    0%, 100% { transform: translateY(0) scale(1); }
    50%       { transform: translateY(-24px) scale(1.4); }
}

/* ── Hero text block ─────── */
.hero-inner {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: .73rem;
    font-weight: 600;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--accent);
    background: rgba(209,140,78,0.1);
    border: 1px solid rgba(209,140,78,0.28);
    padding: 5px 16px;
    border-radius: 20px;
    margin-bottom: 28px;
}
.hero-title {
    font-size: clamp(2.6rem, 6vw, 4.2rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 20px;
    color: var(--text);
    max-width: 860px;
}
.hero-subtitle {
    font-size: 1.08rem;
    color: var(--text-mid);
    margin-bottom: 36px;
    max-width: 660px;
    line-height: 1.7;
}
.hero-subtitle strong { color: var(--text); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin-bottom: 40px; }

.btn-hero-primary {
    background: var(--accent);
    color: #fff;
    padding: 13px 30px;
    border-radius: var(--radius);
    font-size: .97rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
    box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-hero-primary:hover {
    background: var(--accent-h);
    transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(209,140,78,0.45);
}
.btn-hero-secondary {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 13px 26px;
    border-radius: var(--radius);
    font-size: .97rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    transition: border-color var(--transition), background var(--transition);
}
.btn-hero-secondary:hover { border-color: var(--accent); background: rgba(209,140,78,0.06); }

.hero-stats {
    display: flex;
    gap: 0;
    flex-wrap: wrap;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-card);
    margin-bottom: 52px;
}
.hero-stat {
    padding: 14px 32px;
    text-align: center;
    border-right: 1px solid var(--border);
}
.hero-stat:last-child { border-right: none; }
.stat-number {
    display: block;
    font-size: 1.55rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 3px;
}
.stat-label { font-size: .7rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .09em; }

/* ── Hero platform mockup ─────────────────────────────────────────── */
.hero-platform {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1100px;
    padding: 0 24px;
    /* Fade into the section below */
    mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
}
.platform-window {
    background: var(--bg-sidebar);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 24px 80px rgba(0,0,0,0.7), 0 0 0 1px rgba(255,255,255,0.04);
    overflow: hidden;
}
/* Window chrome */
.pw-chrome {
    background: #1a1a1a;
    border-bottom: 1px solid var(--border);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.pw-dots { display: flex; gap: 7px; }
.pw-dot { width: 12px; height: 12px; border-radius: 50%; }
.pw-dot.r { background: #f44747; }
.pw-dot.y { background: #dcdcaa; }
.pw-dot.g { background: var(--success); }
.pw-url {
    flex: 1;
    background: var(--bg-input);
    border-radius: 5px;
    padding: 4px 12px;
    font-size: .72rem;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
    max-width: 320px;
    margin: 0 auto;
    text-align: center;
}
/* Window body = sidebar + main */
.pw-body {
    display: flex;
    height: 420px;
    overflow: hidden;
}
.pw-sidebar {
    width: 180px;
    flex-shrink: 0;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    padding: 16px 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.pw-sidebar-header {
    padding: 0 16px 14px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 10px;
}
.pw-sidebar-header span {
    font-size: .8rem;
    font-weight: 700;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 7px;
}
.pw-sidebar-header small { font-size: .65rem; color: var(--text-dim); display: block; margin-top: 2px; }
.pw-nav-item {
    padding: 9px 16px;
    font-size: .75rem;
    color: var(--text-mid);
    display: flex;
    align-items: center;
    gap: 9px;
    border-left: 3px solid transparent;
    cursor: default;
}
.pw-nav-item.active {
    background: rgba(209,140,78,0.1);
    color: var(--accent);
    border-left-color: var(--accent);
}
.pw-nav-item i { width: 14px; text-align: center; font-size: .75rem; }
.pw-main {
    flex: 1;
    padding: 16px;
    background: var(--bg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.pw-main.pw-main-screenshot {
    padding: 0;
    position: relative;
}
.pw-crossfade {
    position: relative;
    width: 100%;
    height: 100%;
}
.pw-cf-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top left;
    display: block;
}
.pw-cf-img-1 { animation: cf4-1 12s ease-in-out infinite; }
.pw-cf-img-2 { animation: cf4-2 12s ease-in-out infinite; }
.pw-cf-img-3 { animation: cf4-3 12s ease-in-out infinite; }
.pw-cf-img-4 { animation: cf4-4 12s ease-in-out infinite; }

@keyframes cf4-1 {
    0%   { opacity: 1; }
    20%  { opacity: 1; }
    25%  { opacity: 0; }
    95%  { opacity: 0; }
    100% { opacity: 1; }
}
@keyframes cf4-2 {
    0%   { opacity: 0; }
    24%  { opacity: 0; }
    25%  { opacity: 1; }
    45%  { opacity: 1; }
    50%  { opacity: 0; }
    100% { opacity: 0; }
}
@keyframes cf4-3 {
    0%   { opacity: 0; }
    49%  { opacity: 0; }
    50%  { opacity: 1; }
    70%  { opacity: 1; }
    75%  { opacity: 0; }
    100% { opacity: 0; }
}
@keyframes cf4-4 {
    0%   { opacity: 0; }
    74%  { opacity: 0; }
    75%  { opacity: 1; }
    95%  { opacity: 1; }
    100% { opacity: 0; }
}
.pw-fullscreen-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top left;
    display: block;
}
.pw-main-title {
    font-size: .9rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}
.pw-panels {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 10px;
    flex: 1;
    overflow: hidden;
}
.pw-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    overflow: hidden;
}
.pw-panel-wide { grid-column: span 2; }
.pp-label {
    font-size: .65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--text-dim);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 5px;
}
.pp-label i { color: var(--accent); }

/* Scatter plot dots */
.pp-scatter { position: relative; height: 90px; }
.pp-scatter svg { width: 100%; height: 100%; }

/* Persistence diagram */
.pp-pd { position: relative; height: 90px; }
.pp-pd svg { width: 100%; height: 100%; }

/* Mini line chart */
.pp-line { height: 72px; }
.pp-line svg { width: 100%; height: 100%; }

/* Metric rows */
.pp-metrics { display: flex; flex-direction: column; gap: 5px; }
.pp-metric-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: .7rem;
}
.pp-metric-row span:first-child { color: var(--text-mid); }
.pp-metric-val { font-weight: 700; font-family: 'JetBrains Mono', monospace; }
.pp-metric-val.good { color: var(--success); }
.pp-metric-val.warn { color: var(--accent); }

/* Mini bar */
.pp-bar-row { display: flex; flex-direction: column; gap: 4px; }
.pp-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.pp-bar-fill { height: 100%; border-radius: 3px; background: var(--accent); transition: width 1.2s ease; }
.pp-bar-label { display: flex; justify-content: space-between; font-size: .62rem; color: var(--text-dim); }

/* ════════════════════════════════ TRUSTED ══════════════════════════════ */
.trusted {
    padding: 28px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--bg-sidebar);
}
.trusted-label { text-align: center; font-size: .72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 16px; }
.trusted-logos {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px 28px;
}
.trusted-logos span {
    font-size: .83rem;
    font-weight: 600;
    color: var(--text-dim);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color var(--transition);
}
.trusted-logos span:hover { color: var(--text-mid); }
.trusted-logos i { color: var(--accent); }

/* ════════════════════════════════ VISION ═══════════════════════════════ */
.vision {
    padding: 90px 0;
    text-align: center;
}
.vision-grid {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 0;
    max-width: 860px;
    margin: 0 auto;
}
.vision-card {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: left;
    transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
    cursor: default;
}
.vision-card:hover {
    border-color: rgba(209,140,78,0.55);
    box-shadow: 0 0 40px rgba(209,140,78,0.18), 0 8px 32px rgba(0,0,0,0.5);
    transform: translateY(-3px);
}
.vision-card.vision-card-inv {
    border-color: rgba(209,140,78,0.4);
    box-shadow: 0 0 28px rgba(209,140,78,0.12);
}
.vision-card.vision-card-inv:hover {
    border-color: var(--accent);
    box-shadow: 0 0 56px rgba(209,140,78,0.28), 0 8px 32px rgba(0,0,0,0.5);
    transform: translateY(-3px);
}
.vc-icon { font-size: 1.6rem; margin-bottom: 12px; }
.vision-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.vision-card ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.vision-card ul li {
    font-size: .85rem;
    color: var(--text-mid);
    padding-left: 16px;
    position: relative;
}
.vision-card ul li::before {
    content: '·';
    position: absolute;
    left: 4px;
    color: var(--accent);
}
.vision-arrow {
    display: flex;
    align-items: center;
    padding: 0 20px;
    color: var(--accent);
    font-size: 1.3rem;
    flex-shrink: 0;
}

/* ════════════════════════════════ MODULES ══════════════════════════════ */
.modules { padding: 90px 0; text-align: center; }
.modules-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}
.mod-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 24px;
    transition: border-color var(--transition), box-shadow var(--transition), opacity 0.5s, transform 0.5s;
}
.mod-card:hover { border-color: rgba(209,140,78,0.45); box-shadow: 0 0 24px rgba(209,140,78,0.1); }
.mod-card-wide { grid-column: 1 / -1; }
.mod-icon {
    width: 42px; height: 42px;
    background: rgba(209,140,78,0.1);
    border: 1px solid rgba(209,140,78,0.22);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.15rem;
    color: var(--accent);
    margin-bottom: 14px;
}
.mod-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.mod-card p { font-size: .84rem; color: var(--text-mid); line-height: 1.65; margin-bottom: 14px; }
.mod-tags { display: flex; flex-wrap: wrap; gap: 5px; }
.mod-tags span {
    font-size: .7rem;
    font-weight: 600;
    background: rgba(209,140,78,0.08);
    border: 1px solid rgba(209,140,78,0.18);
    color: var(--accent-h);
    padding: 2px 9px;
    border-radius: 4px;
}

/* DR algorithms grid */
.dr-algo-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 14px;
}
.dr-algo {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
}
.dr-algo b { display: block; font-size: .85rem; color: var(--accent); margin-bottom: 3px; }
.dr-algo span { font-size: .75rem; color: var(--text-mid); }

/* Time Series grid */
.ts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 14px;
}
.ts-item {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
}
.ts-item i { font-size: .9rem; color: var(--success); display: block; margin-bottom: 5px; }
.ts-item b { display: block; font-size: .82rem; color: var(--text); margin-bottom: 3px; }
.ts-item span { font-size: .73rem; color: var(--text-mid); }

/* ML grid */
.ml-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 14px;
}
.ml-algo {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
}
.ml-algo b { display: block; font-size: .85rem; color: var(--success); margin-bottom: 3px; }
.ml-algo span { font-size: .75rem; color: var(--text-mid); }

/* ════════════════════════════════ TDA SECTION ══════════════════════════ */
.tda-section {
    padding: 90px 0;
    position: relative;
    overflow: hidden;
    background: var(--bg-sidebar);
}
.tda-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 70% at 85% 50%, rgba(209,140,78,0.08), transparent);
}
.tda-inner {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 56px;
    align-items: center;
    position: relative;
    z-index: 2;
}
.tda-features { display: flex; flex-direction: column; gap: 18px; }
.tda-feat {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.tda-feat > i {
    font-size: 1.1rem;
    color: var(--accent);
    margin-top: 2px;
    flex-shrink: 0;
    width: 26px;
    text-align: center;
}
.tda-feat b { display: block; font-size: .9rem; color: var(--text); margin-bottom: 3px; }
.tda-feat p { font-size: .81rem; color: var(--text-mid); line-height: 1.6; }

/* Persistence diagram */
.tda-diagram { display: flex; flex-direction: column; gap: 12px; }
.pd-container, .betti-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0;
    overflow: hidden;
}
.tda-screenshot {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius);
}
.pd-title { font-size: .72rem; font-weight: 600; color: var(--text-mid); margin-bottom: 8px; letter-spacing: .08em; text-transform: uppercase; }
.pd-svg { width: 100%; max-height: 200px; }
.h0-p { fill: var(--accent); }
.h1-p { fill: var(--success); }
.h2-p { fill: var(--warning); }
.pd-legend { display: flex; gap: 10px; margin-top: 6px; }
.pdl { font-size: .7rem; font-weight: 700; padding: 2px 8px; border-radius: 3px; }
.pdl.h0 { background: rgba(209,140,78,0.15); color: var(--accent-h); }
.pdl.h1 { background: rgba(78,201,176,0.15); color: var(--success); }
.pdl.h2 { background: rgba(220,220,170,0.12); color: var(--warning); }
.betti-svg { width: 100%; }
.betti-line { fill: none; stroke-width: 2; }
.betti-line.b0 { stroke: var(--accent); }
.betti-line.b1 { stroke: var(--success); }

/* ════════════════════════════════ USE CASES ════════════════════════════ */
.usecases { padding: 90px 0; text-align: center; }
.uc-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}
.uc-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 20px;
    transition: border-color var(--transition), box-shadow var(--transition), opacity 0.5s, transform 0.5s;
}
.uc-card:hover { border-color: rgba(209,140,78,0.4); box-shadow: 0 0 20px rgba(209,140,78,0.1); }
.uc-icon {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 12px;
    display: block;
}
.uc-card h4 { font-size: .95rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.uc-card p { font-size: .82rem; color: var(--text-mid); margin-bottom: 12px; line-height: 1.65; }
.uc-results { display: flex; flex-direction: column; gap: 4px; }
.uc-results span { font-size: .76rem; color: var(--text-mid); display: flex; align-items: center; gap: 6px; font-weight: 500; }

/* ════════════════════════════════ TECHNOLOGY ═══════════════════════════ */
.tech { padding: 90px 0; background: var(--bg-sidebar); text-align: center; }
.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}
.tech-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 20px;
    transition: border-color var(--transition), box-shadow var(--transition), opacity 0.5s, transform 0.5s;
}
.tech-card:hover { border-color: rgba(78,201,176,0.4); box-shadow: 0 0 20px rgba(78,201,176,0.08); }
.tech-card > i { font-size: 1.6rem; color: var(--success); display: block; margin-bottom: 12px; }
.tech-card h4 { font-size: .95rem; font-weight: 700; margin-bottom: 7px; color: var(--text); }
.tech-card p { font-size: .82rem; color: var(--text-mid); line-height: 1.65; }

/* ════════════════════════════════ WORKFLOW ═════════════════════════════ */
.workflow { padding: 90px 0; text-align: center; }
.workflow-steps {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 0;
    flex-wrap: wrap;
    margin-top: 48px;
}
.wf-step {
    flex: 1;
    min-width: 160px;
    max-width: 210px;
    padding: 20px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}
.wf-step:hover { border-color: rgba(209,140,78,0.4); }
.wf-num { font-size: .7rem; font-weight: 800; color: var(--accent); letter-spacing: .1em; margin-bottom: 8px; }
.wf-icon { font-size: 1.4rem; color: var(--accent); margin-bottom: 10px; }
.wf-step h4 { font-size: .9rem; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.wf-step p { font-size: .78rem; color: var(--text-mid); }
.wf-arrow {
    color: var(--text-dim);
    font-size: .9rem;
    padding: 0 8px;
    flex-shrink: 0;
    align-self: center;
}

/* ════════════════════════════════ CTA ═══════════════════════════════════ */
.cta-section {
    padding: 90px 0;
    position: relative;
    overflow: hidden;
    text-align: center;
    background: var(--bg);
}
.cta-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 80% 80% at 50% 50%, rgba(209,140,78,0.07), transparent);
}
.cta-inner { position: relative; z-index: 2; }
.cta-inner h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; color: var(--text); margin-bottom: 14px; }
.cta-inner > p { font-size: 1rem; color: var(--text-mid); margin-bottom: 32px; }
.cta-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 20px; }
.btn-cta-primary {
    background: var(--accent);
    color: #fff;
    padding: 14px 38px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    box-shadow: 0 4px 20px var(--accent-glow);
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-cta-primary:hover {
    background: var(--accent-h);
    transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(209,140,78,0.4);
}
.btn-cta-secondary {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-mid);
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    transition: border-color var(--transition), color var(--transition);
}
.btn-cta-secondary:hover { border-color: var(--accent); color: var(--text); }
.cta-note { font-size: .8rem; color: var(--text-dim); display: flex; align-items: center; justify-content: center; gap: 6px; }
.cta-note i { color: var(--success); }

/* ════════════════════════════════ FOOTER ═══════════════════════════════ */
.footer {
    padding: 52px 0 28px;
    border-top: 1px solid var(--border);
    background: var(--bg-sidebar);
}
.footer-inner {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
    margin-bottom: 36px;
}
.footer-brand { flex: 1; min-width: 180px; }
.footer-brand .nav-logo { margin-bottom: 8px; }
.footer-brand p { font-size: .8rem; color: var(--text-dim); margin-top: 7px; }
.footer-links { display: flex; gap: 40px; flex-wrap: wrap; }
.footer-col { display: flex; flex-direction: column; gap: 9px; }
.footer-col h5 { font-size: .75rem; font-weight: 700; color: var(--text-mid); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 4px; }
.footer-col a { font-size: .82rem; color: var(--text-dim); transition: color var(--transition); }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 18px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    font-size: .78rem;
    color: var(--text-dim);
}

/* ════════════════════════════════ RESPONSIVE ═══════════════════════════ */
@media (max-width: 1024px) {
    .tda-inner { grid-template-columns: 1fr; }
    .tda-diagram { flex-direction: row; flex-wrap: wrap; }
    .pd-container, .betti-container { flex: 1; min-width: 200px; }
    .ts-grid { grid-template-columns: repeat(2, 1fr); }
    .ml-grid { grid-template-columns: repeat(2, 1fr); }
    .dr-algo-grid { grid-template-columns: repeat(2, 1fr); }
    .pw-body { height: 340px; }
    .pw-panels { grid-template-columns: 1fr 1fr; }
    .pw-panel-wide { grid-column: span 2; }
}
@media (max-width: 900px) {
    .pw-sidebar { display: none; }
    .hero-stats .hero-stat { padding: 12px 20px; }
}
@media (max-width: 768px) {
    .nav-links-outer {
        display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0;
        background: rgba(30,30,30,0.98); padding: 16px 20px; gap: 16px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links-outer.open { display: flex; }
    .nav-burger { display: block; }
    .nav-cta { display: none; }
    .nav-tools { gap: 10px; }
    .nav-lang-label { display: none; }
    .nav-lang-select { min-width: 112px; padding-left: 10px; }
    .modules-grid { grid-template-columns: 1fr; }
    .uc-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .vision-grid { flex-direction: column; }
    .vision-arrow { transform: rotate(90deg); padding: 12px 0; }
    .dr-algo-grid, .ts-grid, .ml-grid { grid-template-columns: 1fr; }
    .workflow-steps { flex-direction: column; align-items: center; }
    .wf-arrow { transform: rotate(90deg); padding: 8px 0; }
    .pw-body { height: 260px; }
    .pw-panels { grid-template-columns: 1fr 1fr; }
    .hero-stats { flex-direction: column; align-items: center; gap: 0; }
    .hero-stat { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
    .hero-stat:last-child { border-bottom: none; }
}
@media (max-width: 480px) {
    .nav-inner { gap: 14px; }
    .nav-tools { width: auto; }
    .nav-lang-select { min-width: 98px; font-size: .78rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .btn-hero-primary, .btn-hero-secondary { width: 100%; justify-content: center; }
    .pw-panels { grid-template-columns: 1fr; }
    .pw-panel-wide { grid-column: span 1; }
}