/* ========================================
   NoteShell PRO - Apple-Inspired Design System
   ======================================== */

/* CSS Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Colors */
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-bg-tertiary: #e8e8ed;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-text-tertiary: #6e6e73;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-accent-active: #005bb5;
    --color-border: #d2d2d7;
    --color-border-light: #e8e8ed;
    --color-success: #34c759;
    --color-badge-bg: #fbfbfd;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Segoe UI', system-ui, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 17px;
    --font-size-lg: 19px;
    --font-size-xl: 21px;
    --font-size-2xl: 28px;
    --font-size-3xl: 40px;
    --font-size-4xl: 48px;
    --font-size-5xl: 56px;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 80px;

    /* Layout */
    --container-max-width: 980px;
    --container-padding: 24px;

    /* Borders */
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.47;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border-light);
    transition: background var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.92);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.header__logo {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.header__logo:hover {
    color: var(--color-text);
}

.header__nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.header__links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.header__link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.header__link:hover {
    color: var(--color-text);
}

.header__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Language Selector */
.lang-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.lang-selector__btn {
    padding: 4px 8px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: transparent;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.lang-selector__btn:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

.lang-selector__btn.active {
    background: var(--color-text);
    color: var(--color-bg);
}

/* CTA Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn--primary {
    background: var(--color-accent);
    color: #ffffff;
    border: 1px solid var(--color-accent);
}

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

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

.btn--secondary {
    background: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.btn--secondary:hover {
    background: var(--color-accent);
    color: #ffffff;
}

.btn--large {
    padding: 14px 28px;
    font-size: var(--font-size-base);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: 140px 0 80px;
    background: var(--color-bg);
    text-align: center;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 6px 14px;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-success);
    background: rgba(52, 199, 89, 0.1);
    border-radius: 100px;
}

.hero__title {
    font-size: var(--font-size-5xl);
    font-weight: 600;
    line-height: 1.08;
    letter-spacing: -0.025em;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.hero__subtitle {
    font-size: var(--font-size-xl);
    font-weight: 400;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.4;
}

.hero__pricing {
    display: inline-block;
    margin-bottom: var(--spacing-xl);
    padding: 12px 24px;
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius-md);
}

.hero__pricing-text {
    font-size: var(--font-size-base);
    color: var(--color-text);
}

.hero__pricing-text strong {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.hero__cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.hero__video {
    max-width: 800px;
    margin: 0 auto;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    background: #000;
}

.hero__video video,
.hero__video iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
    display: block;
}

/* ========================================
   Section Base
   ======================================== */
.section {
    padding: var(--spacing-4xl) 0;
}

.section--secondary {
    background: var(--color-bg-secondary);
}

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section__title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Gallery
   ======================================== */
.gallery__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.gallery__item {
    text-align: center;
}

.gallery__image-wrapper {
    position: relative;
    background: var(--color-bg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.gallery__image-wrapper:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.gallery__image {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
}

.gallery__caption {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
}

.gallery__desc {
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.gallery__image-wrapper {
    cursor: pointer;
}

/* ========================================
   Lightbox
   ======================================== */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.lightbox.active {
    display: flex;
    animation: lightboxIn 0.25s ease;
}

@keyframes lightboxIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.lightbox__inner {
    position: relative;
    max-width: 900px;
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 32px 80px rgba(0, 0, 0, 0.6);
    animation: lightboxScale 0.25s ease;
}

@keyframes lightboxScale {
    from { transform: scale(0.94); }
    to   { transform: scale(1); }
}

.lightbox__img {
    width: 100%;
    height: auto;
    display: block;
}

.lightbox__close {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #f5f5f7;
    font-size: 20px;
    line-height: 1;
    transition: background 0.2s;
}

.lightbox__close:hover {
    background: rgba(0, 0, 0, 0.75);
}

/* ========================================
   Features
   ======================================== */
.features__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--color-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.feature-card__icon {
    font-size: 36px;
    margin-bottom: var(--spacing-md);
}

.feature-card__title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.feature-card__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.4;
}

/* ========================================
   FAQ
   ======================================== */
.faq__list {
    max-width: 680px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border-light);
}

.faq-item__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-lg) 0;
    text-align: left;
    background: transparent;
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

.faq-item__question {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: inherit;
    padding-right: var(--spacing-lg);
}

.faq-item__icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: transform var(--transition-base);
}

.faq-item.active .faq-item__icon {
    transform: rotate(45deg);
}

.faq-item__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base), padding var(--transition-base);
}

.faq-item.active .faq-item__answer {
    max-height: 500px;
    padding-bottom: var(--spacing-lg);
}

.faq-item__answer p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    text-align: center;
}

.cta-section__title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.cta-section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.cta-section__price {
    display: inline-block;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-bg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.cta-section__price-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.cta-section__price-value {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border-light);
}

.footer__inner {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.footer__links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    list-style: none;
    flex-wrap: wrap;
    justify-content: center;
}

.footer__link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.footer__link:hover {
    color: var(--color-text);
}

.footer__copyright {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-align: center;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 40px;
        --font-size-4xl: 36px;
        --font-size-3xl: 32px;
        --spacing-4xl: 60px;
    }

    .header__links {
        display: none;
    }

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

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

    .hero__cta {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-5xl: 32px;
        --font-size-4xl: 28px;
        --font-size-3xl: 26px;
        --container-padding: 16px;
    }

    .gallery__grid {
        grid-template-columns: 1fr;
    }

    .features__grid {
        grid-template-columns: 1fr;
    }

    .lang-selector {
        gap: 0;
    }

    .lang-selector__btn {
        padding: 4px 6px;
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* ========================================
   Utilities
   ======================================== */
.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;
}

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


/* ========================================
   Banner Allestimento
   ======================================== */
.site-banner {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 8888;
    background: rgba(29, 29, 31, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    color: #f5f5f7;
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
    font-size: 14px;
    padding: 14px 24px;
    border-radius: 40px;
    border: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    gap: 12px;
    white-space: nowrap;
    animation: bannerIn 0.5s ease;
}

@keyframes bannerIn {
    from { opacity: 0; transform: translateX(-50%) translateY(16px); }
    to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.site-banner__close {
    background: none;
    border: none;
    color: #86868b;
    cursor: pointer;
    font-size: 16px;
    padding: 0;
    line-height: 1;
    margin-left: 4px;
    transition: color 0.2s;
}

.site-banner__close:hover {
    color: #f5f5f7;
}

@media (max-width: 768px) {
    .site-banner {
        font-size: 12px;
        padding: 12px 18px;
        bottom: 16px;
        white-space: normal;
        max-width: calc(100vw - 32px);
        text-align: center;
    }
}

/* Gallery 10th item centered */
.gallery__item--centered {
    grid-column: 2;
}

@media (max-width: 768px) {
    .gallery__item--centered {
        grid-column: auto;
    }
}