/* Accessibility - 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;
}

/* Apple-Inspired UI Reset e Stili Globali */
:root {
    --apple-font: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --text-color-primary: #1d1d1f; /* Apple's primary text color (near black) */
    --text-color-secondary: #6e6e73; /* Apple's secondary text color (gray) */
    --link-color: #0066cc; /* Apple's standard link blue */
    --link-hover-color: #00509e;
    --background-color-primary: #ffffff;
    --background-color-secondary: #f5f5f7; /* Apple's light gray background */
    --divider-color: #d2d2d7;
    --button-bg: #007aff;
    --button-text-color: #ffffff;
    --button-hover-bg: #0062cc;
    --card-bg: #ffffff;
    --card-shadow: 0 1px 2px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.05);
    --card-hover-shadow: 0 4px 8px rgba(0,0,0,0.07), 0 8px 16px rgba(0,0,0,0.07);
    --border-radius-general: 12px; /* Apple often uses rounded corners */
    --border-radius-button: 8px;
    --transition-speed: 0.25s ease-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px; /* Base font size */
}

body {
    font-family: var(--apple-font);
    line-height: 1.5;
    color: var(--text-color-primary);
    background-color: var(--background-color-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1;
    font-kerning: normal;
}

.container {
    max-width: 1024px; /* Common Apple container width */
    margin: auto;
    padding: 0 22px; /* Apple's typical padding */
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--apple-font);
    font-weight: 600; /* Apple uses slightly bolder headings */
    margin-bottom: 0.75em;
    color: var(--text-color-primary);
}

h1 {
    font-size: 2.75rem; /* 44px */
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.01em;
}

h2 {
    font-size: 2rem; /* 32px */
    text-align: center;
    margin-bottom: 1.5em;
    font-weight: 600;
    letter-spacing: -0.005em;
}

h3 {
    font-size: 1.5rem; /* 24px */
    font-weight: 500;
}

p {
    margin-bottom: 1.25em;
    font-size: 1.0625rem; /* 17px */
    line-height: 1.65;
    color: var(--text-color-secondary);
}

a {
    text-decoration: none;
    color: var(--link-color);
    transition: color var(--transition-speed);
}

a:hover {
    color: var(--link-hover-color);
    text-decoration: underline;
}

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

/* Header e Navigazione - Apple Style */
header {
    background-color: rgba(255,255,255,0.8); /* Semi-transparent white */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 0.75rem 0; /* Slightly less padding */
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--divider-color);
    box-shadow: none;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem; /* Slightly smaller */
    font-weight: 600;
    color: var(--text-color-primary);
    text-decoration: none;
}

.logo:hover {
    text-decoration: none;
    color: var(--text-color-primary);
}

.logo-icon {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.logo-text {
    font-family: var(--apple-font);
    font-weight: 600;
    letter-spacing: -0.005em;
}

header nav ul {
    list-style: none;
    display: flex;
    align-items: center;
}

header nav ul li {
    margin-left: 20px; /* Slightly less margin */
}

header nav ul li a {
    font-family: var(--apple-font);
    font-weight: 400; /* Regular weight for nav links */
    font-size: 0.9375rem; /* 15px */
    color: var(--text-color-primary);
    padding: 0.5rem 0.25rem;
    position: relative;
    transition: color var(--transition-speed);
}

header nav ul li a:hover {
    color: var(--link-color);
    text-decoration: none;
}

header nav ul li a::after {
   display: none; /* Remove underline effect, Apple doesn't typically use this */
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger {
    display: block;
    width: 22px; /* Thinner hamburger */
    height: 2px;
    background-color: var(--text-color-primary);
    position: relative;
    transition: all var(--transition-speed);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 2px;
    background-color: var(--text-color-primary);
    left: 0;
    transition: all var(--transition-speed);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.menu-toggle.active .hamburger {
    background-color: transparent;
}

.menu-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.menu-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* Hero Section - Apple Style */
.hero-section {
    background: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.6)), url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    color: var(--background-color-primary);
    padding: 6rem 0 7rem;
    text-align: center;
    min-height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content h1 {
    font-size: 3.5rem; /* 56px */
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 0.5em;
    letter-spacing: -0.015em;
    color: var(--background-color-primary);
}

.hero-content .subtitle {
    font-size: 1.5rem; /* 24px */
    font-weight: 400;
    color: rgba(255,255,255,0.85);
    margin-bottom: 1.5em;
    max-width: 600px; /* Constrain subtitle width */
    margin-left: auto;
    margin-right: auto;
}

/* General Button Style (Apple-like) - Applied to .cta-button */
.cta-button {
    display: inline-block;
    background-color: var(--button-bg);
    color: var(--button-text-color);
    padding: 12px 24px;
    font-size: 1.0625rem; /* 17px */
    font-weight: 500; /* Medium weight */
    font-family: var(--apple-font);
    border-radius: var(--border-radius-button);
    text-transform: none; /* Apple buttons are not usually uppercase */
    letter-spacing: normal;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    box-shadow: none;
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    background-color: var(--button-hover-bg);
    transform: translateY(-2px);
    color: var(--button-text-color);
    text-decoration: none;
}

/* Sections - Apple Style */
.services-section, .about-section, .contact-section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--divider-color); /* Subtle dividers */
}

.services-section:last-of-type,
.about-section:last-of-type,
.contact-section:last-of-type {
    border-bottom: none;
}

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

/* Services Section - Apple Style Cards */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.service-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius-general);
    box-shadow: var(--card-shadow);
    text-align: left; /* Apple cards are usually left-aligned */
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
}

.service-icon {
    font-size: 2rem; /* Smaller, more subtle icons */
    color: var(--link-color); /* Use link color for icons */
    margin-bottom: 1rem;
    text-align: center; /* Center icon if it's alone */
    display: block; /* Ensure it takes block for centering */
}

.service-card h3 {
    margin-bottom: 0.5em;
    font-size: 1.3125rem; /* 21px */
    font-weight: 600;
    color: var(--text-color-primary);
}

.service-card p {
    font-size: 0.9375rem; /* 15px */
    color: var(--text-color-secondary);
    line-height: 1.6;
}

/* About Section - Apple Style */
.about-section .container p {
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    font-size: 1.1875rem; /* 19px */
    line-height: 1.7;
    color: var(--text-color-primary); /* Primary text for more emphasis */
}

/* Contact Section - Clean Modern Form */
.contact-section form {
    max-width: 600px;
    margin: 2rem auto;
    padding: 0;
    background-color: transparent;
    border-radius: 0;
    box-shadow: none;
}

.clean-form {
    background: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    border: none;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.form-row .form-group {
    margin-bottom: 0;
}

/* Floating Label Style */
.form-group label {
    position: absolute;
    top: 16px;
    left: 16px;
    font-weight: 400;
    font-size: 1.0625rem; /* 17px */
    font-family: var(--apple-font);
    color: var(--text-color-secondary);
    pointer-events: none;
    transition: all var(--transition-speed);
    background-color: var(--background-color-primary);
    padding: 0 4px;
    z-index: 1;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--divider-color);
    border-radius: var(--border-radius-button);
    font-family: var(--apple-font);
    font-size: 1.0625rem; /* 17px */
    transition: all var(--transition-speed);
    background-color: var(--background-color-primary);
    color: var(--text-color-primary);
    outline: none;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus {
    border-color: var(--link-color);
    box-shadow: 0 0 0 3px rgba(0,102,204,.1);
}

/* Floating label animation */
.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
    top: -8px;
    left: 12px;
    font-size: 0.875rem; /* 14px */
    font-weight: 500;
    color: var(--link-color);
}

/* Textarea specific styles */
.form-group textarea {
    resize: vertical;
    min-height: 120px;
    font-family: var(--apple-font);
    line-height: 1.5;
}

/* Form Submit Button */
.form-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    margin-top: 2rem;
    padding: 16px 24px;
    font-size: 1.125rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--button-bg) 0%, #0056b3 100%);
    border: none;
    border-radius: var(--border-radius-button);
    color: var(--button-text-color);
    cursor: pointer;
    transition: all var(--transition-speed);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.form-submit:hover {
    background: linear-gradient(135deg, var(--button-hover-bg) 0%, #004494 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.4);
}

.form-submit:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.form-submit svg {
    transition: transform var(--transition-speed);
}

.form-submit:hover svg {
    transform: translateX(2px);
}

#form-messages {
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: var(--border-radius-button);
    text-align: center;
    font-weight: 500;
    font-size: 0.9375rem;
    border: 2px solid transparent;
    transition: all var(--transition-speed);
}

#form-messages.success-message {
    background: linear-gradient(135deg, #e6f7ec 0%, #d4f1dd 100%);
    color: #006422;
    border-color: #b7ebc9;
    box-shadow: 0 2px 8px rgba(0, 100, 34, 0.1);
}

#form-messages.error-message {
    background: linear-gradient(135deg, #ffeeee 0%, #ffe6e6 100%);
    color: #a80000;
    border-color: #ffcccc;
    box-shadow: 0 2px 8px rgba(168, 0, 0, 0.1);
}

.contact-details {
    text-align: center;
    margin-top: 3rem;
}

.contact-details p {
    font-size: 1.0625rem; /* 17px */
    margin-bottom: 0.75rem;
    color: var(--text-color-secondary);
}

.contact-details i {
    margin-right: 8px;
    color: var(--link-color);
}

/* Footer - Apple Style */
footer {
    background-color: var(--background-color-secondary); /* Light gray background */
    color: var(--text-color-secondary);
    text-align: center;
    padding: 2.5rem 0;
    margin-top: 0; /* Remove margin if sections have bottom border */
    border-top: 1px solid var(--divider-color);
}

footer p {
    margin-bottom: 0.5rem;
    font-size: 0.8125rem; /* 13px, Apple uses small footer text */
}

footer a {
    color: var(--text-color-secondary);
    text-decoration: none;
}

footer a:hover {
    color: var(--link-color);
    text-decoration: underline;
}

/* GitHub icon styling in footer */
footer i.fab.fa-github {
    margin-right: 8px;
    color: var(--text-color-secondary);
    font-size: 1rem;
    vertical-align: middle;
    transition: color var(--transition-speed);
}

footer i.fab.fa-github:hover {
    color: var(--link-color);
}

/* Responsive Design - Apple Style */
@media (max-width: 768px) {
    html {
        font-size: 15px; /* Adjust base for smaller screens */
    }

    .container {
        padding: 0 16px;
    }
    
    /* Improve touch targets on mobile */
    .cta-button {
        min-height: 44px; /* Apple's minimum touch target */
        min-width: 44px;
    }
    
    /* Better spacing for mobile */
    .hero-section {
        padding: 4rem 0 5rem;
    }
    
    .services-section, .about-section, .contact-section {
        padding: 3rem 0;
    }

    header nav ul {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: calc(100% + 1px); /* Position below header border */
        left: 0;
        background-color: var(--background-color-primary);
        box-shadow: var(--card-shadow);
        padding: 1rem 0;
        border-top: 1px solid var(--divider-color);
    }

    header nav ul.active {
        display: flex;
    }

    header nav ul li {
        margin: 0.75rem 0;
        text-align: center;
    }

    .menu-toggle {
        display: block;
    }

    .hero-content h1 {
        font-size: 2.5rem; /* Adjust for mobile */
    }

    .hero-content .subtitle {
        font-size: 1.25rem; /* Adjust for mobile */
    }

    h1 {
      font-size: 2.25rem;
    }

    h2 {
      font-size: 1.75rem;
    }

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

    .form-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .clean-form {
        padding: 0;
        margin: 0;
    }
    
    .form-submit {
        width: 100%;
        padding: 14px 20px;
        font-size: 1rem;
    }
}