/* ===================================================================
   Foundry AI Demo — Theme variables
   Inspired by zerozeta.com: clean, minimal, light-mode, generous space.
   Accent palette tuned for industrial AI — calm blues + technical greys.
   =================================================================== */

:root {
    /* Brand palette */
    --color-primary:        #0E4DA6;   /* primary brand blue */
    --color-primary-dark:   #083674;
    --color-primary-light:  #5681C8;
    --color-accent:         #00B5A0;   /* teal accent for highlights */
    --color-accent-dark:    #008F7E;

    /* Risk palette (gauges & alerts) */
    --color-risk-low:       #16A34A;   /* green */
    --color-risk-mid:       #F59E0B;   /* amber */
    --color-risk-high:      #DC2626;   /* red */

    /* Neutrals */
    --color-bg:             #FFFFFF;
    --color-bg-soft:        #F7F9FC;
    --color-bg-muted:       #EEF2F8;
    --color-surface:        #FFFFFF;
    --color-surface-dark:   #0F1A2E;   /* hero & dark blocks */
    --color-border:         #E1E6EE;
    --color-border-soft:    #EEF2F8;
    --color-text:           #0F1A2E;   /* near-black with cool tint */
    --color-text-muted:     #4A5468;
    --color-text-soft:      #8290A5;
    --color-text-on-dark:   #F7F9FC;

    /* Typography */
    --font-sans: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Inter', 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', 'Menlo', monospace;

    --fs-xs:    0.75rem;
    --fs-sm:    0.875rem;
    --fs-base:  1rem;
    --fs-md:    1.125rem;
    --fs-lg:    1.375rem;
    --fs-xl:    1.75rem;
    --fs-2xl:   2.25rem;
    --fs-3xl:   3rem;
    --fs-4xl:   3.75rem;

    --fw-regular: 400;
    --fw-medium:  500;
    --fw-semibold: 600;
    --fw-bold: 700;
    --fw-heavy: 800;

    --lh-tight:  1.15;
    --lh-snug:   1.3;
    --lh-normal: 1.55;
    --lh-relaxed: 1.7;

    /* Spacing scale */
    --sp-1:  4px;
    --sp-2:  8px;
    --sp-3:  12px;
    --sp-4:  16px;
    --sp-5:  20px;
    --sp-6:  24px;
    --sp-8:  32px;
    --sp-10: 40px;
    --sp-12: 48px;
    --sp-16: 64px;
    --sp-20: 80px;
    --sp-24: 96px;

    /* Radii */
    --radius-sm: 4px;
    --radius:    8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-pill: 9999px;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(15, 26, 46, 0.05);
    --shadow-sm: 0 2px 6px rgba(15, 26, 46, 0.06);
    --shadow:    0 4px 16px rgba(15, 26, 46, 0.08);
    --shadow-lg: 0 12px 32px rgba(15, 26, 46, 0.12);
    --shadow-glow: 0 0 0 4px rgba(14, 77, 166, 0.12);

    /* Transitions */
    --t-fast: 120ms cubic-bezier(.4,.0,.2,1);
    --t:      200ms cubic-bezier(.4,.0,.2,1);
    --t-slow: 360ms cubic-bezier(.4,.0,.2,1);

    /* Layout */
    --container: 1240px;
    --content-pad: var(--sp-8);
    --nav-h: 64px;
}

/* ===== Resets ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    line-height: var(--lh-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--t);
}
a:hover { color: var(--color-primary-dark); }

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--sp-3);
    line-height: var(--lh-tight);
    font-weight: var(--fw-bold);
    letter-spacing: -0.01em;
    color: var(--color-text);
}
h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }
h5 { font-size: var(--fs-md); }
p  { margin: 0 0 var(--sp-3); color: var(--color-text-muted); }

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
}

/* ===== Utility classes ===== */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--content-pad);
}
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); }
.gap-6 { gap: var(--sp-6); }
.gap-8 { gap: var(--sp-8); }

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-soft  { color: var(--color-text-soft); }
.text-sm    { font-size: var(--fs-sm); }
.text-lg    { font-size: var(--fs-lg); }
.font-mono  { font-family: var(--font-mono); }
.eyebrow {
    color: var(--color-accent-dark);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-6);
    border-radius: var(--radius);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-base);
    border: 1.5px solid transparent;
    transition: all var(--t);
    text-decoration: none;
    cursor: pointer;
}
.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}
.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn-secondary:hover {
    background: var(--color-primary);
    color: #fff;
}
.btn-ghost {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}
.btn-ghost:hover {
    background: var(--color-bg-soft);
    border-color: var(--color-text-muted);
}

/* ===== Cards ===== */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--sp-6);
    transition: box-shadow var(--t), transform var(--t);
}
.card:hover { box-shadow: var(--shadow); }
.card-soft {
    background: var(--color-bg-soft);
    border: 1px solid var(--color-border-soft);
}
.card-dark {
    background: var(--color-surface-dark);
    color: var(--color-text-on-dark);
    border-color: transparent;
}
.card-dark h2, .card-dark h3, .card-dark h4 { color: #fff; }
.card-dark p { color: rgba(247, 249, 252, 0.78); }

/* ===== Badges ===== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-1);
    padding: var(--sp-1) var(--sp-3);
    border-radius: var(--radius-pill);
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    background: var(--color-bg-muted);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    line-height: 1.4;
}
.badge-accent {
    background: rgba(0, 181, 160, 0.10);
    color: var(--color-accent-dark);
    border-color: rgba(0, 181, 160, 0.25);
}
.badge-primary {
    background: rgba(14, 77, 166, 0.10);
    color: var(--color-primary);
    border-color: rgba(14, 77, 166, 0.25);
}
.badge-warning {
    background: rgba(245, 158, 11, 0.10);
    color: #B45309;
    border-color: rgba(245, 158, 11, 0.30);
}
.badge-risk-low  { background: rgba(22, 163, 74, 0.10);  color: #15803D; border-color: rgba(22, 163, 74, 0.25); }
.badge-risk-high { background: rgba(220, 38, 38, 0.10);  color: #B91C1C; border-color: rgba(220, 38, 38, 0.30); }

/* ===== Section ===== */
section.section {
    padding: var(--sp-20) 0;
}
section.section-tight {
    padding: var(--sp-12) 0;
}
section.section-dark {
    background: var(--color-surface-dark);
    color: var(--color-text-on-dark);
}
section.section-soft {
    background: var(--color-bg-soft);
}

/* ===== Navigation ===== */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.95);
    backdrop-filter: saturate(180%) blur(10px);
    -webkit-backdrop-filter: saturate(180%) blur(10px);
    border-bottom: 1px solid var(--color-border-soft);
    height: var(--nav-h);
}
.site-nav .nav-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.site-nav .logo {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    font-weight: var(--fw-bold);
    color: var(--color-text);
    font-size: var(--fs-md);
    text-decoration: none;
}
.site-nav .logo img.logo-img {
    height: 32px;
    width: auto;
    display: block;
}
.site-nav .logo-divider {
    color: var(--color-text-soft);
    font-weight: 400;
    margin: 0 2px;
}
/* Hide the placeholder mark — we use the real logo PNG now */
.site-nav .logo-mark { display: none; }
.site-footer .logo-mark { display: none; }
.site-footer .logo-img {
    height: 28px;
    width: auto;
    filter: brightness(0) invert(1);   /* white version on dark footer */
}
.site-nav .nav-links {
    display: flex;
    align-items: center;
    gap: var(--sp-6);
}
.site-nav .nav-links a {
    color: var(--color-text-muted);
    font-weight: var(--fw-medium);
    font-size: var(--fs-sm);
    padding: var(--sp-2) var(--sp-1);
}
.site-nav .nav-links a:hover,
.site-nav .nav-links a.active {
    color: var(--color-text);
}
.site-nav .nav-links a.active {
    position: relative;
}
.site-nav .nav-links a.active::after {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: -2px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

/* DEMO synthetic data disclosure badge on every page */
.demo-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: 6px var(--sp-3);
    border-radius: var(--radius-pill);
    background: rgba(245, 158, 11, 0.12);
    color: #B45309;
    border: 1px solid rgba(245, 158, 11, 0.35);
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.demo-badge::before {
    content: '';
    width: 8px; height: 8px;
    border-radius: 50%;
    background: #F59E0B;
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.18);
}

/* Footer */
footer.site-footer {
    background: var(--color-surface-dark);
    color: var(--color-text-on-dark);
    padding: var(--sp-12) 0 var(--sp-8);
    margin-top: var(--sp-16);
}
footer.site-footer p { color: rgba(247, 249, 252, 0.70); }
footer.site-footer a { color: var(--color-text-on-dark); }

/* ===== Grid utilities ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-6); }

@media (max-width: 1100px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    :root { --content-pad: var(--sp-4); }
    h1 { font-size: var(--fs-2xl); }
    h2 { font-size: var(--fs-xl); }
    .site-nav .nav-links { gap: var(--sp-3); }
    section.section { padding: var(--sp-12) 0; }
}