/* AIBIZNESLAB v2 — Core (reset + typography + nav + buttons + forms + footer)
 * Source: labclub/styles/v2.css:44-165,232-251,912-942,944-955 + auth.css:51-98
 * Wymaga: tokens.css + fonts.css załadowane WCZEŚNIEJ
 */

/* ===== Reset ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-feature-settings: 'cv11', 'ss01', 'ss03';
    color: var(--text);
    background: var(--bg);
    line-height: 1.55;
    overflow-x: hidden;
    letter-spacing: -0.011em;
}

/* Background grid overlay (fixed, behind content) */
body::before {
    content: '';
    position: fixed; inset: 0;
    pointer-events: none;
    opacity: 0.35;
    background-image:
        linear-gradient(to right, var(--border) 1px, transparent 1px),
        linear-gradient(to bottom, var(--border) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse at center top, black 0%, transparent 70%);
    z-index: 0;
}
body::after {
    content: '';
    position: fixed; inset: 0;
    pointer-events: none;
    opacity: 0.04;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    z-index: 1;
}

/* ===== Container ===== */
.container {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 2;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
    font-family: var(--font-sans);
    font-weight: 500;
    letter-spacing: -0.035em;
    line-height: 1.05;
    color: var(--text);
    text-wrap: balance;
}
h1 { font-size: clamp(2.25rem, 4.2vw, 3.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3.25rem); letter-spacing: -0.032em; }
h3 { font-size: clamp(1.2rem, 2vw, 1.45rem); letter-spacing: -0.02em; }
h4 { font-size: 1rem; letter-spacing: -0.015em; }

.serif-accent {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 400;
    letter-spacing: -0.005em;
}
.mono {
    font-family: var(--font-mono);
    font-weight: 400;
    letter-spacing: 0;
}

p {
    color: var(--text-dim);
    line-height: 1.65;
    max-width: 62ch;
}
a {
    color: inherit;
    text-decoration: none;
    transition: color 0.15s ease;
}

/* Eyebrow label */
.eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-family: var(--font-mono); font-size: 0.72rem; font-weight: 400;
    letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--text-faint);
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--bg-elev-1);
}
.eyebrow .dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Screen-reader only */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}

/* Keyboard shortcut display */
.kbd {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 3px 7px;
    border: 1px solid var(--border); border-radius: 6px;
    font-family: var(--font-mono); font-size: 0.72rem;
    color: var(--text-faint); background: var(--bg-elev-1);
}

/* ===== NAV ===== */
nav.top {
    position: sticky; top: 0; z-index: 50;
    background: rgba(250, 250, 250, 0.78);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    border-bottom: 1px solid var(--border);
}
:root[data-theme="dark"] nav.top { background: rgba(10, 10, 10, 0.72); }

.brand {
    display: inline-flex; align-items: center; gap: 10px;
    font-family: var(--font-serif); font-size: 1.35rem;
    letter-spacing: -0.02em;
    color: var(--text); font-weight: 400;
}
.brand::before {
    content: '';
    width: 8px; height: 8px; border-radius: 2px;
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-line);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 18px;
    border-radius: 10px;
    font-family: var(--font-sans);
    font-size: 0.88rem; font-weight: 500;
    letter-spacing: -0.01em;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.18s ease;
    white-space: nowrap;
}
.btn-primary {
    background: var(--text); color: var(--bg);
    border-color: var(--text);
}
.btn-primary:hover { opacity: 0.92; transform: translateY(-1px); }

.btn-ghost {
    background: transparent; color: var(--text);
    border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--bg-elev-2); }

.btn-accent {
    background: var(--accent); color: #0A0A0A;
    border-color: var(--accent);
    font-weight: 600;
}
.btn-accent:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px -8px var(--accent-line);
}

.btn svg { width: 14px; height: 14px; }

.btn-block {
    width: 100%;
    justify-content: center;
    padding: 12px 18px;
}

/* ===== Forms ===== */
.form-group {
    text-align: left;
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-family: var(--font-mono); font-size: 0.72rem;
    letter-spacing: 0.06em; text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 8px;
}
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    color: var(--text);
    background: var(--bg);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-mute);
}

.form-hint {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-faint);
    margin-top: 6px;
}

.form-error {
    background: var(--accent-soft);
    color: var(--text);
    border: 1px solid var(--accent-line);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    margin-bottom: 14px;
}

/* ===== Footer ===== */
footer {
    padding: 24px 0 20px;
    margin-top: 0;
    position: relative;
    z-index: 2;
}

.footer-brand { margin-bottom: 16px; }

.footer-bottom {
    padding-top: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-mute);
}

/* ===== Reveal animation (scroll-triggered via core.js) ===== */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(12px);
        transition: opacity 0.5s ease, transform 0.5s ease;
    }
    .reveal.visible {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Selection ===== */
::selection { background: var(--accent-soft); color: var(--text); }

/* ===== Mobile ===== */
@media (max-width: 820px) {
    
    .nav-cta .btn-ghost { display: none; }
    
}

@media (max-width: 540px) {
    
    footer { padding: 36px 0 24px; margin-top: 0; }
}

/* ===== Last section before footer: minimal padding-bottom (zero white space) ===== */
section:has(+ footer),
main:has(+ footer),
article:has(+ footer),
.kb-section:last-of-type,
section:last-of-type {
    padding-bottom: 24px !important;
}

/* ===== Serif italic accent (em w headings) ===== */
h1 em, h2 em, h3 em, h4 em,
[class*="-title"] em, [class*="-header"] em, [class*="hero"] em,
.serif-accent, .serif-em {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 400;
    color: var(--accent);
    letter-spacing: -0.01em;
}

/* ===== em w body content = neutral italic ===== */
p em, li em, td em, blockquote em {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text);
    font-weight: 400;
}

/* ===== h5, h6 base ===== */
h5 {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    color: var(--text);
}
h6 {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-faint);
    font-weight: 500;
}

/* ===== Section padding utilities ===== */
.section-lg { padding: 80px 0; }
.section-md { padding: 56px 0; }
.section-sm { padding: 32px 0; }
@media (max-width: 820px) {
    .section-lg { padding: 48px 0; }
    .section-md { padding: 36px 0; }
    .section-sm { padding: 24px 0; }
}

/* ===== Button size modifier (+ use .btn-accent + .btn-lg) ===== */
.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: 12px;
}
.btn-block-lg {
    width: 100%;
    justify-content: center;
    padding: 16px 24px;
    font-size: 1rem;
    border-radius: 12px;
}