/* ============================================
   ZONZINI STAIRCLIMBERS - ANIMATIONS CSS
   Effetti scroll avanzati riutilizzabili
   ============================================ */

/* ============================================
   STACKING SECTIONS
   Sezioni che si sovrappongono con CSS sticky
   ============================================ */

.stacking-container {
    position: relative;
}

.stacking-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: sticky;
    top: 0;
    padding: var(--space-2xl) var(--layout-margin);
    overflow: hidden;
}

.stacking-section:nth-child(1) { z-index: 1; }
.stacking-section:nth-child(2) { z-index: 2; }
.stacking-section:nth-child(3) { z-index: 3; }
.stacking-section:nth-child(4) { z-index: 4; }
.stacking-section:nth-child(5) { z-index: 5; }

.stacking-content {
    max-width: 800px;
    text-align: center;
}

.stacking-content h2 {
    margin-bottom: var(--space-lg);
}

.stacking-content p {
    font-size: var(--font-size-large);
    opacity: 0.9;
    line-height: var(--line-height-loose);
}

/* Colori predefiniti stacking */
.stacking-section.bg-red { background: #e63946; color: white; }
.stacking-section.bg-blue { background: #457b9d; color: white; }
.stacking-section.bg-green { background: #2a9d8f; color: white; }
.stacking-section.bg-dark { background: var(--color-secondary); color: white; }
.stacking-section.bg-primary { background: var(--color-primary); color: white; }

.stacking-section.bg-red h2,
.stacking-section.bg-blue h2,
.stacking-section.bg-green h2,
.stacking-section.bg-dark h2,
.stacking-section.bg-primary h2 {
    color: white;
}

/* ============================================
   PINNED SECTION
   Metà fissa, metà che scorre
   ============================================ */

.pinned-section {
    display: flex;
    min-height: 100vh;
}

.pinned-left {
    width: 50%;
    height: 100vh;
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    background: var(--color-secondary);
    color: white;
}

.pinned-left h2 {
    max-width: 400px;
    line-height: var(--line-height-heading);
    color: white;
}

.pinned-right {
    width: 50%;
}

.pinned-panel {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
}

.pinned-panel h3 {
    font-size: var(--font-size-h4);
    margin-bottom: var(--space-md);
    color: var(--color-secondary);
}

.pinned-panel p {
    font-size: var(--font-size-body);
    max-width: 400px;
    line-height: var(--line-height-loose);
    color: var(--color-text-light);
}

/* Colori pannelli pinned */
.pinned-panel.bg-yellow { background: #e9c46a; }
.pinned-panel.bg-orange { background: #f4a261; }
.pinned-panel.bg-coral { background: #e76f51; }
.pinned-panel.bg-light { background: var(--color-gray-100); }

/* Mobile: pinned diventa sticky header piccolo */
@media (max-width: 768px) {
    .pinned-section {
        flex-direction: column;
    }

    .pinned-left {
        width: 100%;
        height: auto;
        min-height: 20vh;
        position: sticky;
        top: 0;
        z-index: 10;
        padding: var(--space-lg) var(--layout-margin);
    }

    .pinned-left h2 {
        font-size: var(--font-size-h5);
        max-width: 100%;
    }

    .pinned-right {
        width: 100%;
    }

    .pinned-panel {
        min-height: 80vh;
        padding: var(--space-xl) var(--layout-margin);
    }
}

/* ============================================
   HORIZONTAL SCROLL
   Pannelli che scorrono orizzontalmente
   ============================================ */

.horizontal-wrapper {
    overflow: hidden;
    position: relative;
    z-index: 20;
}

.horizontal-container {
    display: flex;
    width: max-content;
}

.horizontal-panel {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    padding: var(--space-2xl);
}

.horizontal-panel .panel-content {
    text-align: center;
    max-width: 600px;
}

.horizontal-panel h2 {
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-md);
}

.horizontal-panel p {
    font-size: var(--font-size-large);
    line-height: var(--line-height-loose);
}

/* Colori pannelli horizontal */
.horizontal-panel.bg-purple { background: #9b5de5; color: white; }
.horizontal-panel.bg-pink { background: #f15bb5; color: white; }
.horizontal-panel.bg-yellow { background: #fee440; color: var(--color-secondary); }
.horizontal-panel.bg-cyan { background: #00bbf9; color: white; }

.horizontal-panel.bg-purple h2,
.horizontal-panel.bg-pink h2,
.horizontal-panel.bg-cyan h2 {
    color: white;
}

.horizontal-panel.bg-yellow h2,
.horizontal-panel.bg-yellow p {
    color: var(--color-secondary);
}

/* ============================================
   CARD BOXED
   Card con margini visibili e bordi arrotondati
   ============================================ */

.section-card {
    background: var(--color-secondary);
    padding: var(--layout-margin);
}

.section-card .card-inner {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--space-4xl) var(--space-3xl);
    color: var(--color-text);
}

.section-card .card-inner h2 {
    color: var(--color-text);
}

@media (max-width: 768px) {
    .section-card .card-inner {
        padding: var(--space-2xl) var(--space-lg);
        border-radius: var(--radius-lg);
    }
}

/* Layout due colonne dentro card */
.card-inner.two-cols {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

@media (max-width: 992px) {
    .card-inner.two-cols {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.section-text h2 {
    margin-bottom: var(--space-lg);
}

.section-text p {
    font-size: var(--font-size-body);
    line-height: var(--line-height-loose);
    color: var(--color-text-light);
}

.section-image {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
}

/* ============================================
   REVEAL SECTION
   Card che appaiono con animazione
   ============================================ */

.reveal-section {
    padding: var(--space-4xl) var(--layout-margin);
    background: var(--color-gray-100);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    position: relative;
    z-index: 1;
}

.reveal-section-inner {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.reveal-section h2 {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.reveal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.reveal-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateY(60px);
}

.reveal-card h3 {
    font-size: var(--font-size-h5);
    color: var(--color-secondary);
    margin-bottom: var(--space-md);
}

.reveal-card p {
    font-size: var(--font-size-body);
    color: var(--color-text-light);
    line-height: var(--line-height-loose);
}

/* ============================================
   FOOTER PARALLAX
   Footer che si rivela da sotto
   ============================================ */

.footer-wrapper {
    height: 100vh;
    position: relative;
}

.footer-parallax {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: -1;
    overflow: hidden;
    background: var(--color-secondary);
    color: white;
}

.footer-parallax .footer-content {
    text-align: center;
    will-change: transform;
}

.footer-parallax h2 {
    font-size: var(--font-size-h1);
    margin-bottom: var(--space-md);
    letter-spacing: 4px;
    color: white;
}

.footer-parallax p {
    font-size: var(--font-size-large);
    opacity: 0.6;
}

.footer-parallax .footer-links {
    margin-top: var(--space-3xl);
    display: flex;
    gap: var(--space-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.footer-parallax .footer-links a {
    color: rgba(255,255,255,0.5);
    text-decoration: none;
    font-family: var(--font-primary);
    font-size: var(--font-size-small);
    transition: color var(--transition-fast);
}

.footer-parallax .footer-links a:hover {
    color: white;
}

/* ============================================
   FULLSCREEN MENU
   Menu overlay a schermo intero
   ============================================ */

.fullscreen-menu {
    position: fixed;
    inset: 0;
    background: rgba(13, 27, 42, 0.98);
    backdrop-filter: blur(20px);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.5s ease;
}

.fullscreen-menu.active {
    opacity: 1;
    visibility: visible;
}

.menu-nav {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: center;
}

.menu-nav li {
    margin: var(--space-md) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s ease;
}

.fullscreen-menu.active .menu-nav li {
    opacity: 1;
    transform: translateY(0);
}

.fullscreen-menu.active .menu-nav li:nth-child(1) { transition-delay: 0.1s; }
.fullscreen-menu.active .menu-nav li:nth-child(2) { transition-delay: 0.15s; }
.fullscreen-menu.active .menu-nav li:nth-child(3) { transition-delay: 0.2s; }
.fullscreen-menu.active .menu-nav li:nth-child(4) { transition-delay: 0.25s; }
.fullscreen-menu.active .menu-nav li:nth-child(5) { transition-delay: 0.3s; }
.fullscreen-menu.active .menu-nav li:nth-child(6) { transition-delay: 0.35s; }

.menu-nav a {
    font-family: var(--font-primary);
    font-size: clamp(2rem, 5vw, 4rem);
    color: white;
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    transition: opacity var(--transition-fast);
}

.menu-nav a:hover {
    opacity: 0.6;
}

/* ============================================
   EFFETTI AGGIUNTIVI
   ============================================ */

/* Fade variants */
.fade-up {
    opacity: 0;
    transform: translateY(60px);
}

.fade-down {
    opacity: 0;
    transform: translateY(-60px);
}

.fade-left {
    opacity: 0;
    transform: translateX(-60px);
}

.fade-right {
    opacity: 0;
    transform: translateX(60px);
}

.fade-scale {
    opacity: 0;
    transform: scale(0.8);
}

.fade-rotate {
    opacity: 0;
    transform: rotate(-10deg);
}

/* 3D effects */
.fade-3d {
    opacity: 0;
    transform: perspective(1000px) rotateX(20deg) translateY(40px);
    transform-origin: center bottom;
}

/* Blur effect */
.fade-blur {
    opacity: 0;
    filter: blur(10px);
    transform: translateY(30px);
}

/* Clip path effects */
.fade-clip-up {
    clip-path: inset(100% 0 0 0);
}

.fade-clip-circle {
    clip-path: circle(0% at 50% 50%);
}

/* Skew effect */
.fade-skew {
    opacity: 0;
    transform: skewY(10deg) translateY(40px);
}

/* Bounce (handled by JS with elastic ease) */
.fade-bounce {
    opacity: 0;
    transform: translateY(80px);
}

/* ============================================
   BODY STATES
   ============================================ */

body.menu-open {
    overflow: hidden;
}

/* ============================================
   PREFERS REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    .stacking-section,
    .pinned-left,
    .horizontal-panel,
    .reveal-card,
    .fade-up,
    .fade-down,
    .fade-left,
    .fade-right,
    .fade-scale,
    .fade-rotate,
    .fade-3d,
    .fade-blur,
    .fade-clip-up,
    .fade-clip-circle,
    .fade-skew,
    .fade-bounce,
    .menu-nav li {
        opacity: 1 !important;
        transform: none !important;
        filter: none !important;
        clip-path: none !important;
        transition: none !important;
    }
}