/* EyeAI shared design kit — the "EyeAI Lab" light system extracted from
   index.html so every page speaks one visual language. Load after fonts:
   Inter (body), Space Grotesk (headings/wordmark), JetBrains Mono (data).
   Pages add their own layout CSS on top of these primitives; anything dark
   inside an app page scopes itself with .instrument (see bottom). */

:root {
    --paper: #FAFAF8;
    --surface: #FFFFFF;
    --ink: #0E1116;
    --muted: #5C6570;
    --hairline: #E4E2DC;
    --accent: #1E4FD8;
    --accent-hover: #1a44bb;
    --signal: #C7551F;
    --signal-text: #A8441A;        /* --signal darkened for small text (AA) */
    --signal-text-inverse: #E06A30;
    --ink-inverse: #FAFAF8;
    /* on-ink (footer / dark band) ramp */
    --ink-body: #B9C0C8;
    --ink-muted: #98A1AB;
    --ink-hairline: #2A3037;
    /* status colors that hold AA contrast on light backgrounds */
    --ok-text: #0A7D43;
    --warn-text: #8A6400;
    --danger-text: #B3261E;
    --shadow-1: 0 1px 2px rgba(14, 17, 22, 0.06);
    --shadow-2: 0 8px 24px rgba(14, 17, 22, 0.12);
}

/* ---- reset + base ---- */

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

html {
    -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--paper);
    color: var(--ink);
    font-size: 1.0625rem;
    font-weight: 400;
    line-height: 1.65;
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2 {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.15;
}

h1 { font-size: clamp(2.1rem, 5vw, 3.2rem); }
h2 { font-size: 1.9rem; }

h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
}

p { max-width: 65ch; }
a { color: var(--accent); }
img { max-width: 100%; }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Icons: quiet by default */
.fas, .fa-solid {
    font-size: 0.9em;
    color: var(--muted);
}

.btn-primary .fas, .cta-nav .fas, .submit-button .fas {
    color: #FFFFFF;
}

/* ---- utility type ---- */

.eyebrow {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 0.9rem;
}

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

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- header / nav ---- */

.skip-link {
    position: absolute;
    left: -9999px;
    background: var(--surface);
    color: var(--ink);
    padding: 0.5rem 1rem;
    z-index: 1100;
}

.skip-link:focus-visible {
    left: 12px;
    top: 12px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--paper);
    border-bottom: 1px solid var(--hairline);
}

nav#main-nav { width: 100%; }

nav#main-nav.scrolled {
    box-shadow: var(--shadow-1);
}

.nav-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    position: relative;
}

.logo {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    color: var(--ink);
    text-decoration: none;
}

.logo:hover { color: var(--accent); }

.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 1.35rem;
}

.nav-links a {
    color: var(--ink);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.35rem 0;
    white-space: nowrap;
    transition: color 150ms ease;
}

.nav-links a:hover { color: var(--accent); }

.nav-links a.active {
    box-shadow: inset 0 -2px 0 var(--accent);
}

.nav-links a.nav-quiet { color: var(--muted); }
.nav-links a.nav-quiet:hover { color: var(--ink); }

.nav-links li.nav-sep {
    width: 1px;
    height: 18px;
    background: var(--hairline);
}

ul.nav-links a.cta-nav {
    background: var(--accent);
    color: #FFFFFF;
    border-radius: 6px;
    padding: 0.5rem 1.1rem;
    font-weight: 500;
    transition: background-color 150ms ease;
}

ul.nav-links a.cta-nav:hover {
    background: var(--accent-hover);
    color: #FFFFFF;
}

.hamburger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 16px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger-menu span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--ink);
    border-radius: 2px;
    transition: transform 150ms ease, opacity 150ms ease;
}

.hamburger-menu.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger-menu.open span:nth-child(2) { opacity: 0; }
.hamburger-menu.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 1099px) {
    .hamburger-menu { display: flex; }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--paper);
        border-bottom: 1px solid var(--hairline);
        padding: 0.5rem 24px 1rem;
    }

    .nav-links.active { display: flex; }

    .nav-links a {
        display: block;
        padding: 0.7rem 0;
    }

    .nav-links a.active { box-shadow: none; color: var(--accent); }

    .nav-links li.nav-sep {
        width: 100%;
        height: 1px;
        margin: 0.4rem 0;
    }

    ul.nav-links a.cta-nav {
        display: inline-block;
        margin-top: 0.6rem;
        text-align: center;
    }
}

/* ---- buttons ---- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.4;
    padding: 0.65rem 1.25rem;
    border-radius: 6px;
    border: 1px solid transparent;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease, transform 150ms ease;
}

.btn-primary {
    background: var(--accent);
    color: #FFFFFF;
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--ink);
    border-color: var(--ink);
}

.btn-secondary:hover {
    background: var(--surface);
    transform: translateY(-1px);
}

.btn-block { width: 100%; }

button[aria-busy="true"] {
    opacity: 0.7;
    cursor: not-allowed;
    pointer-events: none;
}

.text-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
}

.text-link:hover { text-decoration: underline; }

/* ---- cards + badges ---- */

.card {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: 8px;
    box-shadow: var(--shadow-1);
}

.card--interactive {
    transition: border-color 150ms ease, transform 150ms ease;
}

.card--interactive:hover {
    border-color: var(--ink);
    transform: translateY(-1px);
}

.badge {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    border: 1px solid var(--hairline);
    border-radius: 6px;
    padding: 0.3rem 0.7rem;
}

.badge--ok { color: var(--ok-text); border-color: var(--ok-text); }
.badge--warn { color: var(--warn-text); border-color: var(--warn-text); }

/* ---- forms ---- */

.form-group { margin-bottom: 1.15rem; }

.form-group label {
    display: block;
    margin-bottom: 0.35rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
}

.form-group label .required {
    color: var(--signal-text);
    margin-left: 0.15rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.6rem 0.75rem;
    background: var(--paper);
    border: 1px solid var(--hairline);
    border-radius: 6px;
    color: var(--ink);
    font-size: 0.95rem;
    font-family: 'Inter', sans-serif;
    transition: border-color 150ms ease;
}

.form-group input:focus-visible,
.form-group select:focus-visible,
.form-group textarea:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-color: var(--accent);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--muted);
    opacity: 1;
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--signal);
}

.error-message {
    display: block;
    color: var(--signal-text);
    font-size: 0.82rem;
    margin-top: 0.3rem;
}

.error-message:empty { display: none; }

.form-success-message,
.form-error-message {
    padding: 0.85rem 1rem;
    border-radius: 6px;
    margin-bottom: 1.15rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.92rem;
    border: 1px solid var(--hairline);
    background: var(--surface);
}

.form-success-message { border-color: var(--accent); color: var(--ink); }
.form-success-message .fas { color: var(--accent); }
.form-error-message { border-color: var(--signal); color: var(--ink); }
.form-error-message .fas { color: var(--signal-text); }

/* ---- footer ---- */

.site-footer {
    background: var(--ink);
    color: var(--ink-inverse);
    padding: 64px 0 32px;
    margin-top: 96px;
    font-size: 0.9rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2.5rem;
}

.footer-wordmark {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    color: var(--ink-inverse);
}

.footer-brand p {
    color: var(--ink-body);
    font-size: 0.9rem;
    max-width: 34ch;
    margin-top: 0.8rem;
}

.footer-h {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-muted);
    margin-bottom: 1rem;
}

.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 0.55rem; }

.site-footer a {
    color: var(--ink-body);
    font-size: 0.9rem;
    text-decoration: none;
    transition: color 150ms ease;
}

.site-footer a:hover { color: var(--ink-inverse); }

.site-footer a:focus-visible,
.site-footer button:focus-visible,
.site-footer input:focus-visible {
    outline-color: var(--ink-inverse);
}

.footer-bottom {
    border-top: 1px solid var(--ink-hairline);
    margin-top: 3rem;
    padding-top: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.75rem;
    font-size: 0.8rem;
    color: var(--ink-muted);
}

.footer-bottom a {
    color: var(--ink-muted);
    font-size: 0.8rem;
}

@media (max-width: 960px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 540px) {
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}

/* ---- chatbot (light, shared) ---- */

.chatbot-widget {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 10000;
}

.chatbot-button {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--ink);
    border: 1px solid var(--ink);
    color: var(--ink-inverse);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1px;
    box-shadow: var(--shadow-1);
    transition: transform 150ms ease, background-color 150ms ease;
}

.chatbot-button:hover {
    transform: translateY(-1px);
    background: #1c222b;
}

.chatbot-button .fas {
    color: var(--ink-inverse);
    font-size: 1rem;
}

.chatbot-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.5rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: rgba(250, 250, 248, 0.72);
}

.chat-interface {
    position: fixed;
    bottom: 92px;
    right: 24px;
    width: 360px;
    height: 480px;
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: 8px;
    box-shadow: var(--shadow-2);
    z-index: 9999;
    overflow: hidden;
}

.chat-header {
    background: var(--ink);
    color: var(--ink-inverse);
    padding: 0.8rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.chat-header .fas { color: rgba(250, 250, 248, 0.72); }

.chat-close {
    background: none;
    border: none;
    color: var(--ink-inverse);
    font-size: 1.1rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    transition: background-color 150ms ease;
}

.chat-close:hover { background: rgba(250, 250, 248, 0.15); }

.chat-body {
    height: calc(100% - 42px);
    display: flex;
    flex-direction: column;
    background: var(--surface);
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.chat-message {
    max-width: 85%;
    padding: 0.6rem 0.85rem;
    border-radius: 8px;
    font-size: 0.9rem;
    line-height: 1.5;
}

.chat-message.bot {
    background: var(--paper);
    border: 1px solid var(--hairline);
    color: var(--ink);
    align-self: flex-start;
}

.chat-message.user {
    background: var(--accent);
    color: #FFFFFF;
    align-self: flex-end;
}

.chat-message.typing { color: var(--muted); }

.llm-response { border-left: 2px solid var(--accent) !important; }

.ai-indicator {
    color: var(--accent);
    font-weight: 500;
    font-size: 0.85em;
}

.chat-error {
    border: 1px solid var(--signal);
    color: var(--signal-text);
    background: var(--surface);
    padding: 0.6rem 0.85rem;
    border-radius: 6px;
    font-size: 0.85rem;
}

.chat-input-area {
    padding: 0.75rem;
    border-top: 1px solid var(--hairline);
    display: flex;
    gap: 0.5rem;
}

.chat-input {
    flex: 1;
    padding: 0.55rem 0.75rem;
    background: var(--paper);
    border: 1px solid var(--hairline);
    border-radius: 6px;
    color: var(--ink);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    transition: border-color 150ms ease;
}

.chat-input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-color: var(--accent);
}

.chat-send {
    padding: 0.55rem 0.9rem;
    background: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 6px;
    color: #FFFFFF;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 150ms ease;
}

.chat-send:hover { background: var(--accent-hover); }
.chat-send .fas { color: #FFFFFF; }

.chat-messages::-webkit-scrollbar { width: 6px; }
.chat-messages::-webkit-scrollbar-track { background: var(--paper); }
.chat-messages::-webkit-scrollbar-thumb { background: var(--hairline); border-radius: 3px; }

@media (max-width: 700px) {
    .chat-interface {
        width: auto;
        left: 12px;
        right: 12px;
        bottom: 92px;
        height: 70vh;
        max-height: 70vh;
    }
}

/* ---- instrument scope ----
   Dark tool surfaces (the designer canvas, its toolbars/panels) opt in with
   class="instrument": the dark token set is re-declared locally so the
   surrounding page stays on the light system while the instrument keeps its
   tuned dark palette. The designer's JS-drawn surfaces (canvas, 3D, wiring
   diagram) hardcode matching colors and are unaffected by page tokens. */

.instrument {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #141414;
    --bg-elevated: #1a1a1a;
    --accent-primary: #3e6ae1;
    --accent-secondary: #2d5bc7;
    --accent-success: #00d563;
    --accent-warning: #f4c430;
    --accent-danger: #e31937;
    --text-primary: #ffffff;
    --text-secondary: #e4e4e4;
    --text-tertiary: #a0a0a0;
    --text-muted: #8b949e;
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-medium: rgba(255, 255, 255, 0.15);
    --border-strong: rgba(255, 255, 255, 0.25);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    background: #0b0d10;
    border-radius: 8px;
    color: var(--text-primary);
}