/* ============================================================================
 * VALTIERI GROUP — BASE STYLES v2.0
 * Foundation reset + shared component patterns
 * ============================================================================ */

/* === RESET === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--weight-regular);
    line-height: var(--leading-normal);
    color: var(--grey-900);
    background-color: var(--vg-surface, #FAFAF8);
    overflow-x: hidden;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: var(--weight-light);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    margin: 0;
    color: var(--grey-900);
}

h1 {
    font-size: clamp(var(--text-3xl), 6vw, var(--text-5xl));
    font-weight: var(--weight-light);
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
    font-weight: var(--weight-light);
}

h3 {
    font-size: clamp(var(--text-lg), 2.5vw, var(--text-xl));
    font-weight: var(--weight-regular);
}

p { margin: 0; }

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration-normal) var(--ease-default);
}

strong { font-weight: var(--weight-semibold); }

small { font-size: var(--text-sm); }

/* === DATA TYPOGRAPHY === */
.data-value, .metric-value {
    font-family: var(--font-data);
    font-weight: var(--weight-regular);
    letter-spacing: var(--tracking-tight);
}

/* === IMAGES === */
img, svg, video {
    max-width: 100%;
    height: auto;
    display: block;
}

img { image-rendering: auto; }

/* === FORMS === */
input, textarea, select, button {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

/* === TABLES === */
table {
    border-collapse: collapse;
    width: 100%;
}

th, td {
    padding: var(--space-4);
    text-align: left;
}

/* === LISTS === */
ul, ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* === CODE === */
code, pre {
    font-family: var(--font-data);
    font-size: var(--text-sm);
}

pre {
    padding: var(--space-5);
    overflow-x: auto;
    background: var(--grey-50);
    border: var(--border-subtle);
}

/* ============================================================================
 * LAYOUT SYSTEM
 * ============================================================================ */

.container {
    width: 100%;
    max-width: var(--max-w-content);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container--wide {
    max-width: var(--max-w-wide);
}

.container--prose {
    max-width: var(--max-w-prose);
}

.container--full {
    max-width: var(--max-w-full);
}

/* === SECTION SPACING === */
.section {
    padding: var(--space-16) 0;
}

.section--compact {
    padding: var(--space-10) 0;
}

.section--hero {
    padding: var(--space-20) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

/* === GRID === */
.grid {
    display: grid;
    gap: var(--grid-gap);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
    .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
    .container { padding: 0 var(--space-5); }
    .section { padding: var(--space-10) 0; }
    .section--hero {
        padding: var(--space-12) 0;
        min-height: 60vh;
    }
}

@media (max-width: 480px) {
    .container { padding: 0 var(--space-4); }
    .section { padding: var(--space-8) 0; }
}

/* ============================================================================
 * SHARED COMPONENTS
 * ============================================================================ */

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    text-decoration: none;
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-default);
    white-space: nowrap;
    line-height: 1;
    position: relative;
    overflow: hidden;
}

.btn--primary {
    background: var(--grey-900);
    color: #FFFFFF;
    border-color: var(--grey-900);
}

.btn--primary:hover {
    background: transparent;
    color: var(--grey-900);
}

.btn--outline {
    background: transparent;
    color: var(--grey-900);
    border-color: var(--grey-900);
}

.btn--outline:hover {
    background: var(--grey-900);
    color: #FFFFFF;
}

.btn--gold {
    background: transparent;
    color: var(--vg-accent);
    border-color: var(--vg-accent);
}

.btn--gold:hover {
    background: var(--vg-accent);
    color: var(--grey-900);
}

.btn--sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-sm);
}

/* === CARDS === */
.card {
    padding: var(--space-8);
    background: #FFFFFF;
    border: var(--border-subtle);
    transition: all var(--duration-slow) var(--ease-default);
    position: relative;
}

.card:hover {
    border-color: rgba(0, 0, 0, 0.15);
    box-shadow: var(--shadow-sm);
}

.card--bordered {
    border: var(--border-light);
}

.card--elevated {
    box-shadow: var(--shadow-sm);
    border: none;
}

.card--elevated:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* === DIVIDERS === */
.divider {
    width: 48px;
    height: 1px;
    background: var(--vg-accent);
    margin: var(--space-6) 0;
}

.divider--center {
    margin-left: auto;
    margin-right: auto;
}

/* === BADGES === */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-family: var(--font-data);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    border: 1px solid currentColor;
    line-height: 1.4;
}

/* === SECTION HEADERS === */
.section-header {
    max-width: var(--max-w-prose);
    margin-bottom: var(--space-10);
}

.section-header--center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.section-eyebrow {
    display: block;
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-widest);
    text-transform: uppercase;
    color: var(--vg-accent);
    margin-bottom: var(--space-4);
}

.section-lead {
    font-size: var(--text-md);
    line-height: var(--leading-relaxed);
    color: var(--grey-600);
    margin-top: var(--space-5);
}

/* ============================================================================
 * ICON SYSTEM (Phosphor-style thin line icons)
 * ============================================================================ */

.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
    stroke-width: 1.5;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.icon--sm { width: 16px; height: 16px; }
.icon--md { width: 24px; height: 24px; }
.icon--lg { width: 32px; height: 32px; }
.icon--xl { width: 48px; height: 48px; }

/* === ICON CONTAINER (for feature cards) === */
.icon-frame {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    margin-bottom: var(--space-5);
    color: var(--vg-accent);
}

/* ============================================================================
 * ANIMATIONS (Intersection Observer driven)
 * ============================================================================ */

/* Reveal animations — applied by JS when element enters viewport */
[data-reveal] {
    opacity: 0;
    transition: opacity var(--duration-reveal) var(--ease-out),
                transform var(--duration-reveal) var(--ease-out);
}

[data-reveal="fade"] {
    transform: none;
}

[data-reveal="up"] {
    transform: translateY(24px);
}

[data-reveal="left"] {
    transform: translateX(-24px);
}

[data-reveal="right"] {
    transform: translateX(24px);
}

[data-reveal="scale"] {
    transform: scale(0.96);
}

[data-reveal].revealed {
    opacity: 1;
    transform: none;
}

/* Stagger children — delay increments */
[data-stagger] > *:nth-child(1) { transition-delay: 0ms; }
[data-stagger] > *:nth-child(2) { transition-delay: 80ms; }
[data-stagger] > *:nth-child(3) { transition-delay: 160ms; }
[data-stagger] > *:nth-child(4) { transition-delay: 240ms; }
[data-stagger] > *:nth-child(5) { transition-delay: 320ms; }
[data-stagger] > *:nth-child(6) { transition-delay: 400ms; }

/* ============================================================================
 * NAVIGATION (shared base)
 * ============================================================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: var(--border-subtle);
    transition: all var(--duration-normal) var(--ease-default);
}

.nav.scrolled {
    box-shadow: var(--shadow-xs);
}

.nav__inner {
    max-width: var(--max-w-wide);
    margin: 0 auto;
    padding: var(--space-4) var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav__logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav__logo svg {
    height: 28px;
    width: auto;
}

.nav__logo-text {
    font-family: var(--font-display);
    font-size: var(--text-md);
    font-weight: var(--weight-light);
    letter-spacing: var(--tracking-widest);
    color: var(--grey-900);
    text-transform: uppercase;
}

.nav__links {
    display: flex;
    gap: var(--space-8);
    list-style: none;
    align-items: center;
}

.nav__link {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-wide);
    color: var(--grey-700);
    text-decoration: none;
    position: relative;
    padding: var(--space-1) 0;
    transition: color var(--duration-normal) var(--ease-default);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: currentColor;
    transition: width var(--duration-normal) var(--ease-default);
}

.nav__link:hover,
.nav__link.active {
    color: var(--grey-900);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

/* Mobile toggle */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    cursor: pointer;
    background: none;
    border: none;
}

.nav__toggle span {
    width: 22px;
    height: 1.5px;
    background: var(--grey-900);
    transition: all var(--duration-normal) var(--ease-default);
    display: block;
}

.nav__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}

.nav__toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
}

@media (max-width: 768px) {
    .nav__toggle { display: flex; }
    .nav__links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        padding: var(--space-6);
        gap: 0;
        border-bottom: var(--border-light);
    }
    .nav__links.open { display: flex; }
    .nav__link {
        padding: var(--space-4) 0;
        border-bottom: var(--border-subtle);
        width: 100%;
    }
    .nav__link:last-child { border-bottom: none; }
}

/* ============================================================================
 * FOOTER (shared base)
 * ============================================================================ */

.footer {
    background: var(--grey-900);
    color: #FFFFFF;
    padding: var(--space-16) 0 var(--space-8);
}

.footer__inner {
    max-width: var(--max-w-wide);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-10);
    margin-bottom: var(--space-10);
}

.footer__brand-name {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: var(--weight-light);
    letter-spacing: var(--tracking-widest);
    text-transform: uppercase;
    margin-bottom: var(--space-3);
}

.footer__brand-tagline {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.5);
    line-height: var(--leading-relaxed);
}

.footer__heading {
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-widest);
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: var(--space-5);
}

.footer__links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer__link {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--duration-normal) var(--ease-default);
}

.footer__link:hover {
    color: #FFFFFF;
}

.footer__bottom {
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer__copyright {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.35);
}

.footer__endorsement {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.35);
}

@media (max-width: 768px) {
    .footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }
    .footer__bottom {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .footer__grid { grid-template-columns: 1fr; }
}

/* ============================================================================
 * UTILITY CLASSES
 * ============================================================================ */

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

.hidden { display: none !important; }

.text-center { text-align: center; }
.text-right { text-align: right; }

.mx-auto { margin-left: auto; margin-right: auto; }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* Skip link */
.skip-link {
    position: absolute;
    top: -100px;
    left: var(--space-4);
    background: var(--grey-900);
    color: #FFFFFF;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    z-index: 9999;
    transition: top var(--duration-fast) var(--ease-default);
}

.skip-link:focus { top: var(--space-2); }