/* ============================================================
   HAPIS - HAP Intel Systems — Landing Page Styles
   Mobile-first, CSS custom properties, zero frameworks
   ============================================================ */

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

:root {
    --color-bg:       #0b0f19;
    --color-surface:  #131927;
    --color-surface2: #1a2235;
    --color-border:   #232d42;
    --color-text:     #c9d1d9;
    --color-heading:  #e6edf3;
    --color-muted:    #8b949e;
    --color-primary:  #58a6ff;
    --color-primary-hover: #79b8ff;
    --color-accent:   #3fb950;
    --color-accent2:  #d2a8ff;
    --font-sans:      'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono:      'JetBrains Mono', 'Fira Code', Consolas, monospace;
    --max-width:      1140px;
    --radius:         8px;
    --radius-lg:      12px;
    --transition:     0.25s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-hover); }
ul { list-style: none; }
code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--color-surface2);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

/* --- Container --- */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 1.25rem; }

/* --- Section shared --- */
.section__title {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    color: var(--color-heading);
    text-align: center;
    margin-bottom: 0.75rem;
    line-height: 1.25;
}
.section__subtitle {
    text-align: center;
    color: var(--color-muted);
    max-width: 640px;
    margin: 0 auto 2.5rem;
    font-size: 1.05rem;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.7rem 1.6rem;
    border-radius: var(--radius);
    transition: background var(--transition), transform var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-hover); color: #fff; }
.btn--secondary {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}
.btn--secondary:hover { background: rgba(88,166,255,0.1); color: var(--color-primary-hover); }
.btn--small { padding: 0.5rem 1.2rem; font-size: 0.875rem; }
.btn--full { width: 100%; }

/* --- Navigation --- */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    padding: 0.9rem 0;
    background: transparent;
    transition: background var(--transition), box-shadow var(--transition);
}
.nav--scrolled {
    background: rgba(11,15,25,0.92);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--color-border);
}
.nav__container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav__logo { display: flex; align-items: center; gap: 0.6rem; }
.nav__logo-mark {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--color-primary);
    background: rgba(88,166,255,0.12);
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    letter-spacing: 0.04em;
}
.nav__logo-text { font-weight: 600; color: var(--color-heading); font-size: 0.95rem; }

.nav__menu { display: flex; align-items: center; gap: 1.8rem; }
.nav__link { color: var(--color-muted); font-size: 0.9rem; font-weight: 500; transition: color var(--transition); }
.nav__link:hover { color: var(--color-heading); }
.nav__link--cta {
    background: var(--color-primary);
    color: #fff !important;
    padding: 0.4rem 1rem;
    border-radius: var(--radius);
    font-weight: 600;
}
.nav__link--cta:hover { background: var(--color-primary-hover); }
.nav__link--active { color: var(--color-heading); }
.nav__link--has-dropdown { cursor: pointer; }

/* Dropdown */
.nav__item--dropdown { position: relative; }
.nav__dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 200px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.5rem 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    z-index: 101;
}
.nav__item--dropdown:hover .nav__dropdown,
.nav__item--dropdown:focus-within .nav__dropdown {
    opacity: 1;
    visibility: visible;
}
.nav__dropdown-link {
    display: block;
    padding: 0.5rem 1.25rem;
    color: var(--color-muted);
    font-size: 0.88rem;
    font-weight: 500;
    transition: background var(--transition), color var(--transition);
}
.nav__dropdown-link:hover { background: var(--color-surface2); color: var(--color-heading); }
.nav__dropdown-link--active { color: var(--color-primary); }

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav__toggle span { width: 22px; height: 2px; background: var(--color-heading); border-radius: 2px; transition: var(--transition); }
.nav__toggle--active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav__toggle--active span:nth-child(2) { opacity: 0; }
.nav__toggle--active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* --- Hero --- */
.hero {
    padding: 6rem 0 5rem;
    display: flex;
    align-items: center;
    background:
        radial-gradient(ellipse 60% 50% at 50% 0%, rgba(88,166,255,0.08) 0%, transparent 70%),
        var(--color-bg);
}
.hero .container { display: flex; align-items: center; gap: 4rem; }
.hero__content { flex: 1; }
.hero__title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    color: var(--color-heading);
    line-height: 1.15;
    margin-bottom: 1.25rem;
}
.hero__eyebrow {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: 1rem;
}
.hero__accent { color: var(--color-primary); }
.hero__subtitle {
    font-size: 1.15rem;
    color: var(--color-muted);
    max-width: 520px;
    margin-bottom: 2rem;
    line-height: 1.7;
}
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero__trust {
    margin-top: 2rem;
    font-size: 0.85rem;
    color: var(--color-muted);
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}
.hero__trust span { white-space: nowrap; }
.hero__trust-sep { color: var(--color-border); }

.hero__visual { flex: 0 0 380px; }

/* HeroProductPreview — sample API request/response card */
.hero-preview {
    margin: 0;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 16px 40px rgba(0,0,0,0.35);
}
.hero-preview__bar {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 0.85rem;
    background: var(--color-surface2);
    border-bottom: 1px solid var(--color-border);
}
.hero-preview__dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--color-border);
}
.hero-preview__file {
    margin-left: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--color-muted);
}
.hero-preview__code {
    margin: 0;
    padding: 1.1rem 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    line-height: 1.7;
    color: var(--color-text);
    overflow-x: auto;
    white-space: pre;
}
.tok-c { color: var(--color-muted); }
.tok-k { color: var(--color-primary); }
.tok-n { color: var(--color-accent); }
.tok-s { color: var(--color-accent2); }

/* --- Problem --- */
.problem { padding: 5rem 0; }
.problem .section__title { margin-bottom: 2.5rem; }
.problem__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.problem__card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
}
.problem__icon {
    display: flex;
    margin-bottom: 0.85rem;
    color: var(--color-primary);
}
.problem__icon--amber { color: #fbbf24; }
.problem__icon--red   { color: #f87171; }
.problem__icon--blue  { color: #60a5fa; }
.problem__card h3 { color: var(--color-heading); margin-bottom: 0.5rem; font-size: 1.1rem; }

/* --- Products --- */
.products { padding: 5rem 0; }
.products__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.products__more { text-align: center; margin-top: 2rem; font-size: 0.95rem; font-weight: 600; }
.product-card__actions { margin-top: auto; }

.product-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    transition: border-color var(--transition), transform var(--transition);
}
.product-card:hover { border-color: var(--color-primary); transform: translateY(-3px); }
.product-card--featured { border-color: var(--color-primary); position: relative; }
.product-card--featured::before {
    content: 'Popular';
    position: absolute; top: -10px; right: 20px;
    background: var(--color-primary); color: #fff;
    font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
    padding: 0.2rem 0.6rem; border-radius: 4px;
}

.product-card__badge {
    display: inline-block;
    font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--color-primary);
    background: rgba(88,166,255,0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.75rem;
    width: fit-content;
}
.product-card__title { color: var(--color-heading); font-size: 1.25rem; margin-bottom: 0.6rem; }
.product-card__desc { color: var(--color-muted); font-size: 0.92rem; margin-bottom: 1rem; line-height: 1.6; }
.product-card__features { margin-bottom: 1.5rem; flex: 1; }
.product-card__features li {
    padding: 0.3rem 0;
    padding-left: 1.2rem;
    position: relative;
    font-size: 0.9rem;
}
.product-card__features li::before {
    content: '\2713';
    position: absolute; left: 0;
    color: var(--color-accent);
    font-weight: 700;
}

/* --- How It Works --- */
.how-it-works { padding: 5rem 0; background: var(--color-surface); }
.steps__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.step {
    text-align: center;
    padding: 2rem 1.5rem;
}
.step__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(88,166,255,0.12);
    color: var(--color-primary);
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 1rem;
    border: 2px solid rgba(88,166,255,0.3);
}
.step h3 { color: var(--color-heading); margin-bottom: 0.5rem; font-size: 1.1rem; }
.step p { color: var(--color-muted); font-size: 0.92rem; line-height: 1.6; }

/* --- Standards --- */
.standards { padding: 5rem 0; background: var(--color-surface); }
.standards__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; margin-bottom: 3rem; }
.standards__group-title { color: var(--color-heading); font-size: 1rem; margin-bottom: 0.75rem; }
.standards__tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.tag {
    display: inline-block;
    background: var(--color-surface2);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.82rem;
    white-space: nowrap;
}

.standards__proof {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
    text-align: center;
    padding: 2rem;
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}
.standards__stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}
.standards__stat-label { font-size: 0.85rem; color: var(--color-muted); }

/* --- Use Cases --- */
.use-cases { padding: 5rem 0; }
.use-cases__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
.use-case {
    padding: 1.75rem 1.5rem;
    border-left: 3px solid var(--color-primary);
    background: var(--color-surface);
    border-radius: 0 var(--radius) var(--radius) 0;
}
.use-case h3 { color: var(--color-heading); font-size: 1.05rem; margin-bottom: 0.5rem; }
.use-case p { font-size: 0.92rem; color: var(--color-muted); }

/* --- Proof --- */
.proof { padding: 5rem 0; }
.proof__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}
.proof__card {
    display: flex;
    flex-direction: column;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem 1.5rem;
    transition: border-color var(--transition), transform var(--transition);
}
a.proof__card:hover { border-color: var(--color-primary); transform: translateY(-3px); }
.proof__card-icon { display: flex; color: var(--color-primary); margin-bottom: 0.9rem; }
.proof__card h3 { color: var(--color-heading); font-size: 1.05rem; margin-bottom: 0.4rem; }
.proof__card p { color: var(--color-muted); font-size: 0.9rem; line-height: 1.6; flex: 1; }
.proof__card-link {
    margin-top: 1rem;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-primary);
}
.proof__map { width: 100%; border-collapse: collapse; }
.proof__map td {
    padding: 0.4rem 0;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--color-border);
}
.proof__map tr:last-child td { border-bottom: none; }
.proof__map td:last-child { text-align: right; }

/* --- API Response Example (collapsible) --- */
.api-example {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    padding: 1rem 1.25rem;
    margin-top: 2.5rem;
}
.api-example summary {
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-heading);
}
.api-example__code {
    margin-top: 1rem;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.7;
    color: var(--color-text);
    white-space: pre;
}

/* --- Pricing --- */
.pricing { padding: 5rem 0; background: var(--color-surface); }
.pricing__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; max-width: 900px; margin: 0 auto; }
.pricing__card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
}
.pricing__card--featured { border-color: var(--color-primary); }
.pricing__tier { color: var(--color-heading); font-size: 1.35rem; margin-bottom: 0.25rem; }
.pricing__price {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}
.pricing__limit {
    font-size: 0.78rem;
    color: var(--color-muted);
    margin: -0.15rem 0 1rem;
}
.pricing__desc { color: var(--color-muted); font-size: 0.9rem; margin-bottom: 1.25rem; }
.pricing__features { flex: 1; margin-bottom: 1.5rem; }
.pricing__features li {
    padding: 0.35rem 0;
    padding-left: 1.2rem;
    position: relative;
    font-size: 0.9rem;
}
.pricing__features li::before {
    content: '\2713';
    position: absolute; left: 0;
    color: var(--color-accent);
    font-weight: 700;
}

/* --- About --- */
.about { padding: 5rem 0; }
.about__content { display: grid; grid-template-columns: 2fr 1fr; gap: 3rem; align-items: start; }
.about__text p { margin-bottom: 1rem; line-height: 1.7; }
.about__tech h3 { color: var(--color-heading); margin-bottom: 0.75rem; font-size: 1rem; }
.about__tech-heading { margin-top: 1.5rem; }
.about__stack { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.about__contact { color: var(--color-muted); font-size: 0.92rem; line-height: 1.8; }

/* --- Construction Banner --- */
.construction-banner {
    background: repeating-linear-gradient(
        -45deg,
        #1a1a00,
        #1a1a00 10px,
        #2a2a00 10px,
        #2a2a00 20px
    );
    border-top: 3px solid #fbbf24;
    border-bottom: 3px solid #fbbf24;
    text-align: center;
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: #fbbf24;
    letter-spacing: 0.03em;
}

.construction-banner__icon {
    display: inline-flex;
    vertical-align: -3px;
    margin-right: 0.3rem;
}

/* --- Footer --- */
.footer { padding: 3rem 0 1.5rem; border-top: 1px solid var(--color-border); }
.footer__grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 2rem; margin-bottom: 2rem; }
.footer__brand p { color: var(--color-muted); font-size: 0.9rem; margin-top: 0.75rem; }
.footer__links h4 { color: var(--color-heading); font-size: 0.9rem; margin-bottom: 0.75rem; }
.footer__links li { margin-bottom: 0.4rem; }
.footer__links a { color: var(--color-muted); font-size: 0.85rem; }
.footer__links a:hover { color: var(--color-primary); }
.footer__bottom { border-top: 1px solid var(--color-border); padding-top: 1.25rem; }
.footer__bottom-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}
.footer__bottom p { color: var(--color-muted); font-size: 0.8rem; }
.footer__social { display: flex; gap: 1rem; align-items: center; }
.footer__social a { color: var(--color-muted); transition: color var(--transition); }
.footer__social a:hover { color: var(--color-primary); }

/* --- Page Header (internal pages) --- */
.page-header {
    padding: 8rem 0 3rem;
    background:
        radial-gradient(ellipse 60% 50% at 50% 0%, rgba(88,166,255,0.06) 0%, transparent 70%),
        var(--color-bg);
}
.page-header__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--color-heading);
    margin-bottom: 0.5rem;
}
.page-header__subtitle {
    color: var(--color-muted);
    font-size: 1.05rem;
    max-width: 640px;
    line-height: 1.6;
}

/* --- Card Grid (reusable) --- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

/* --- Article Card --- */
.article-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem 1.5rem;
    transition: border-color var(--transition), transform var(--transition);
    display: flex;
    flex-direction: column;
}
.article-card:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.article-card__meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.82rem;
    color: var(--color-muted);
}
.article-card__badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    background: rgba(88,166,255,0.1);
    color: var(--color-primary);
}
.article-card__badge--itu { background: rgba(210,168,255,0.12); color: var(--color-accent2); }
.article-card__badge--3gpp { background: rgba(63,185,80,0.12); color: var(--color-accent); }
.article-card__badge--major { background: rgba(255,85,85,0.12); color: #ff5555; }
.article-card__badge--minor { background: rgba(255,183,77,0.12); color: #ffb74d; }
.article-card__title {
    color: var(--color-heading);
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    line-height: 1.35;
}
.article-card__desc {
    color: var(--color-muted);
    font-size: 0.9rem;
    line-height: 1.6;
    flex: 1;
    margin-bottom: 1rem;
}
.article-card__tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1rem; }
.article-card__link { font-size: 0.9rem; font-weight: 600; }

/* --- Tag Filter --- */
.tag--filter {
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.tag--filter:hover { border-color: var(--color-primary); color: var(--color-primary); }
.tag--filter.active {
    background: rgba(88,166,255,0.15);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* --- Filter Bar --- */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
    align-items: center;
}
.filter-bar__label {
    font-size: 0.85rem;
    color: var(--color-muted);
    font-weight: 600;
    margin-right: 0.5rem;
}

/* --- Timeline (Changelog) --- */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}
.timeline__entry {
    position: relative;
    padding-bottom: 2.5rem;
}
.timeline__entry::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.35rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 2px solid var(--color-bg);
    transform: translateX(-5px);
}
.timeline__header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}
.timeline__version {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-heading);
}
.timeline__date {
    font-size: 0.82rem;
    color: var(--color-muted);
}
.timeline__product {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    background: rgba(88,166,255,0.1);
    color: var(--color-primary);
}
.timeline__changes h4 {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
    margin-top: 0.5rem;
}
.timeline__changes h4.added { color: var(--color-accent); }
.timeline__changes h4.changed { color: var(--color-primary); }
.timeline__changes h4.fixed { color: #ffb74d; }
.timeline__changes ul {
    list-style: disc;
    padding-left: 1.25rem;
    margin-bottom: 0.5rem;
}
.timeline__changes li {
    font-size: 0.9rem;
    color: var(--color-text);
    padding: 0.15rem 0;
}

/* --- Filter Tabs --- */
.filter-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}
.filter-tab {
    padding: 0.6rem 1.25rem;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-muted);
    cursor: pointer;
    border: none;
    background: none;
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
}
.filter-tab:hover { color: var(--color-heading); }
.filter-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* --- Doc Card --- */
.doc-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    transition: border-color var(--transition), transform var(--transition);
}
.doc-card:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.doc-card__icon { font-size: 2rem; margin-bottom: 1rem; }
.doc-card__title { color: var(--color-heading); font-size: 1.2rem; margin-bottom: 0.5rem; }
.doc-card__desc { color: var(--color-muted); font-size: 0.92rem; line-height: 1.6; margin-bottom: 1.25rem; }

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--color-muted);
}
.empty-state__icon { display: flex; justify-content: center; color: var(--color-primary); margin-bottom: 1rem; }
.empty-state__title { color: var(--color-heading); font-size: 1.2rem; margin-bottom: 0.5rem; }
.empty-state p { max-width: 540px; margin: 0.75rem auto 0; line-height: 1.6; }

/* --- Content Section --- */
.content-section { padding: 3rem 0 5rem; }

/* --- Quick Start Code Block --- */
.code-block {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1.5rem 0;
}
.code-block pre {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text);
    line-height: 1.7;
    margin: 0;
    white-space: pre;
}
.code-block__label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-muted);
    margin-bottom: 0.75rem;
}

/* --- Legal Pages --- */
.legal { padding: 8rem 0 4rem; }
.legal__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--color-heading);
    margin-bottom: 0.5rem;
}
.legal__updated { color: var(--color-muted); font-size: 0.9rem; margin-bottom: 2.5rem; }
.legal__content h2 {
    color: var(--color-heading);
    font-size: 1.2rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}
.legal__content h3 {
    color: var(--color-heading);
    font-size: 1rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}
.legal__content p { margin-bottom: 0.75rem; line-height: 1.7; }
.legal__content ul {
    list-style: disc;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
}
.legal__content li { margin-bottom: 0.4rem; line-height: 1.6; }
.legal__back { margin-top: 3rem; }

/* --- Animations --- */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav__toggle { display: flex; }
    .nav__menu {
        position: fixed; top: 0; right: -100%; width: 70%; height: 100vh;
        background: var(--color-surface);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        gap: 1.5rem;
        transition: right var(--transition);
        box-shadow: -4px 0 20px rgba(0,0,0,0.4);
    }
    .nav__menu--open { right: 0; }
    .nav__link { font-size: 1.05rem; }

    /* Mobile dropdown */
    .nav__dropdown {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        background: none;
        border: none;
        box-shadow: none;
        padding: 0 0 0 1rem;
        min-width: auto;
        display: none;
    }
    .nav__item--dropdown-open .nav__dropdown { display: block; }
    .nav__dropdown-link { padding: 0.4rem 0; font-size: 0.95rem; }

    .hero .container { flex-direction: column; text-align: center; }
    .hero__subtitle { margin-left: auto; margin-right: auto; }
    .hero__actions { justify-content: center; }
    .hero__visual { flex: none; width: 100%; max-width: 440px; }
    .hero__trust { justify-content: center; }

    .about__content { grid-template-columns: 1fr; }
    .footer__grid { grid-template-columns: 1fr 1fr; }

    .card-grid { grid-template-columns: 1fr; }
    .timeline { padding-left: 1.5rem; }
    .filter-tabs { overflow-x: auto; }
}

@media (max-width: 480px) {
    .hero { padding-top: 6rem; min-height: auto; }
    .hero__title { font-size: 1.75rem; }
    .products__grid, .pricing__grid { grid-template-columns: 1fr; }
    .footer__grid { grid-template-columns: 1fr; }
    .standards__proof { grid-template-columns: 1fr 1fr; }
    .footer__bottom-row { justify-content: center; text-align: center; }
}

/* =============================================================================
   ABOUT / FOUNDER / COMPANY-INFO additions (May 2026)
   ============================================================================= */

.section__title--left {
    text-align: left;
}

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

.founder {
    max-width: 760px;
    margin: 0 auto;
}
.founder__text p {
    margin: 0 0 1rem;
    line-height: 1.7;
}
.founder__links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.founder__links-sep {
    color: var(--color-muted, #6a7180);
    font-weight: 300;
}

.company-info {
    max-width: 720px;
    margin: 0 auto;
    background: var(--color-surface2);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.75rem 2rem;
}
.company-info__list {
    display: grid;
    grid-template-columns: minmax(150px, 220px) 1fr;
    gap: 0.6rem 1.5rem;
    margin: 0 0 1rem;
}
.company-info__list dt {
    font-weight: 600;
    color: var(--color-heading, #1a1f2b);
}
.company-info__list dd {
    margin: 0;
    color: var(--color-text, #3a4151);
}
.company-info__note {
    margin: 1rem 0 0;
    padding-top: 1rem;
    border-top: 1px dashed var(--color-border, #e3e6ec);
    font-size: 0.92rem;
    color: var(--color-muted, #6a7180);
}

/* =============================================================================
   LONG-FORM ARTICLE (whitepaper) styles
   ============================================================================= */

.article {
    padding: 3rem 0 5rem;
    background: var(--color-surface);
    color: var(--color-text);
}
.container--narrow {
    max-width: 820px;
    margin: 0 auto;
    padding: 0 1.5rem;
}
.article__header {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border, #e3e6ec);
}
.article__eyebrow {
    font-size: 0.9rem;
    margin: 0 0 0.5rem;
}
.article__eyebrow a {
    color: var(--color-muted, #6a7180);
    text-decoration: none;
}
.article__eyebrow a:hover { color: var(--color-primary); }

.article__title {
    font-size: 2.1rem;
    line-height: 1.25;
    color: var(--color-heading, #1a1f2b);
    margin: 0 0 0.75rem;
}
.article__subtitle {
    font-size: 1.05rem;
    color: var(--color-muted, #6a7180);
    line-height: 1.55;
    margin: 0 0 1.5rem;
}
.article__meta {
    display: grid;
    grid-template-columns: minmax(150px, 200px) 1fr;
    gap: 0.4rem 1.25rem;
    margin: 0 0 1.5rem;
    font-size: 0.92rem;
}
.article__meta dt {
    font-weight: 600;
    color: var(--color-heading, #1a1f2b);
}
.article__meta dd {
    margin: 0;
    color: var(--color-text, #3a4151);
}
.article__status {
    background: rgba(210, 153, 34, 0.10);
    border: 1px solid rgba(210, 153, 34, 0.35);
    border-left: 4px solid #d4a72c;
    border-radius: 6px;
    padding: 0.85rem 1rem;
    font-size: 0.93rem;
    color: #e8c468;
    margin: 0;
}
.article__status strong { color: #f3d27a; }
.article__status a { color: #f3d27a; text-decoration: underline; }
.article__status a:hover { color: #ffe39a; }

.article__section {
    margin: 2.25rem 0;
    line-height: 1.7;
}
.article__section h2 {
    font-size: 1.5rem;
    color: var(--color-heading, #1a1f2b);
    margin: 1.5rem 0 0.75rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border, #e3e6ec);
}
.article__section h3 {
    font-size: 1.15rem;
    color: var(--color-heading, #1a1f2b);
    margin: 1.5rem 0 0.5rem;
}
.article__section p {
    margin: 0 0 1rem;
}
.article__section ul, .article__section ol {
    margin: 0 0 1rem;
    padding-left: 1.4rem;
}
.article__section li {
    margin: 0.25rem 0;
    line-height: 1.65;
}
.article__section code {
    background: var(--color-surface2);
    border-radius: 3px;
    padding: 0.1rem 0.4rem;
    font-size: 0.92em;
    color: var(--color-heading);
}

.article__formula,
.article__diagram {
    background: var(--color-bg);
    color: #d6e0ff;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1rem 1.25rem;
    overflow-x: auto;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0.75rem 0 1.25rem;
}
.article__diagram {
    white-space: pre;
    font-size: 0.82rem;
    line-height: 1.4;
}

.article__table {
    width: 100%;
    border-collapse: collapse;
    margin: 0.75rem 0 1.5rem;
    font-size: 0.92rem;
}
.article__table th,
.article__table td {
    text-align: left;
    padding: 0.55rem 0.75rem;
    border-bottom: 1px solid var(--color-border, #e3e6ec);
    vertical-align: top;
}
.article__table thead th {
    background: var(--color-surface2);
    color: var(--color-heading);
    font-weight: 600;
    border-bottom: 2px solid var(--color-border);
}
.article__table tbody tr:hover { background: rgba(88, 166, 255, 0.06); }
.article__table--compact { font-size: 0.86rem; }
.article__table--compact th,
.article__table--compact td { padding: 0.4rem 0.55rem; }

.article__refs {
    font-size: 0.92rem;
}
.article__refs li {
    margin: 0.35rem 0;
    line-height: 1.55;
}

.article__footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border, #e3e6ec);
    font-size: 0.92rem;
    color: var(--color-muted, #6a7180);
}
.article__footer-back { margin-top: 0.5rem; }
.article__footer-back a { color: var(--color-primary); text-decoration: none; }
.article__footer-back a:hover { text-decoration: underline; }

/* Status badges used inline in tier headings */
.status-badge {
    display: inline-block;
    margin-left: 0.5rem;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    vertical-align: middle;
    border: 1px solid transparent;
}
.status-badge--ok {
    background: rgba(63, 185, 80, 0.14);
    border-color: rgba(63, 185, 80, 0.40);
    color: #7ee297;
}
.status-badge--warn {
    background: rgba(210, 153, 34, 0.14);
    border-color: rgba(210, 153, 34, 0.40);
    color: #f3b53d;
}
.status-badge--plan {
    background: rgba(88, 166, 255, 0.14);
    border-color: rgba(88, 166, 255, 0.40);
    color: #79b8ff;
}

/* Compact variant of empty-state (used below the whitepaper card on /papers) */
.empty-state--compact {
    background: var(--color-surface);
    border: 1px dashed var(--color-border);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin-top: 2rem;
    text-align: left;
}
.empty-state--compact p {
    max-width: none;
    margin: 0 0 0.5rem;
    font-size: 0.95rem;
    color: var(--color-text);
}
.empty-state--compact p:last-child { margin-bottom: 0; }

/* Article responsive */
@media (max-width: 640px) {
    .article__title { font-size: 1.6rem; }
    .article__meta,
    .company-info__list { grid-template-columns: 1fr; gap: 0.15rem 0; }
    .article__meta dt,
    .company-info__list dt { margin-top: 0.5rem; }
    .article__table { font-size: 0.85rem; }
    .article__table--compact { font-size: 0.78rem; }
    .article__diagram { font-size: 0.72rem; }
}