/* ==========================================================================
   Ghostline Group — Landing Page Styles
   Direzione: "Lusso ingegneristico silenzioso"
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
    /* Palette */
    --color-black:    #0A0A0A;
    --color-white:    #F5F2ED;
    --color-gold:     #B8965A;
    --color-grey:     #8A8A8A;
    --color-blue:     #4A9EBF;
    --color-dark-surface: #111111;
    --color-card-bg:  #161616;
    --color-border:   #2A2A2A;

    /* Typography */
    --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono:  'JetBrains Mono', 'Courier New', monospace;

    /* Spacing */
    --space-xs:   0.5rem;
    --space-sm:   1rem;
    --space-md:   1.5rem;
    --space-lg:   3rem;
    --space-xl:   5rem;
    --space-2xl:  8rem;

    /* Layout */
    --max-width:  1200px;

    /* Transitions */
    --ease-out:   cubic-bezier(0.22, 1, 0.36, 1);
    --duration:   0.4s;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-white);
    background-color: var(--color-black);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    color: var(--color-gold);
    text-decoration: none;
    transition: color var(--duration) var(--ease-out);
}

a:hover,
a:focus-visible {
    color: var(--color-white);
}

ul {
    list-style: none;
}

/* ---------- Utilities ---------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.mono {
    font-family: var(--font-mono);
}

/* 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;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: 1px solid transparent;
    border-radius: 0;
    cursor: pointer;
    transition: all var(--duration) var(--ease-out);
    text-decoration: none;
    line-height: 1;
}

.btn-primary {
    background-color: var(--color-gold);
    color: var(--color-black);
    border-color: var(--color-gold);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background-color: transparent;
    color: var(--color-gold);
}

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

.btn-outline:hover,
.btn-outline:focus-visible {
    border-color: var(--color-gold);
    color: var(--color-gold);
}

/* ---------- Header ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-sm) 0;
    background-color: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--duration) var(--ease-out),
                padding var(--duration) var(--ease-out);
}

.site-header.scrolled {
    border-bottom-color: var(--color-border);
    padding: 0.625rem 0;
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-white);
    text-decoration: none;
}

.logo:hover {
    color: var(--color-white);
}

.logo-dot {
    color: var(--color-gold);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-list a {
    font-size: 0.8125rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-grey);
    transition: color var(--duration) var(--ease-out);
}

.nav-list a:hover,
.nav-list a:focus-visible {
    color: var(--color-white);
}

.nav-cta {
    padding: 0.5rem 1.25rem;
    border: 1px solid var(--color-gold) !important;
    color: var(--color-gold) !important;
}

.nav-cta:hover,
.nav-cta:focus-visible {
    background-color: var(--color-gold);
    color: var(--color-black) !important;
}

/* Mobile toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 1.5px;
    background-color: var(--color-white);
    transition: transform var(--duration) var(--ease-out),
                opacity var(--duration) var(--ease-out);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}
.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: var(--space-2xl) 0 var(--space-xl);
    overflow: hidden;
}

.hero-inner {
    position: relative;
    z-index: 2;
    max-width: 720px;
}

.hero-eyebrow {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-gold);
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
}

.hero-accent {
    color: var(--color-gold);
}

.hero-sub {
    font-size: 1.125rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--color-grey);
    max-width: 560px;
    margin-bottom: var(--space-lg);
}

.hero-cta-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.hero-gradient {
    position: absolute;
    top: 0;
    right: -10%;
    width: 60%;
    height: 100%;
    background: radial-gradient(ellipse at 70% 40%,
        rgba(184, 150, 90, 0.06) 0%,
        rgba(74, 158, 191, 0.03) 40%,
        transparent 70%);
    pointer-events: none;
}

/* ---------- Sections (shared) ---------- */
.section {
    padding: var(--space-2xl) 0;
}

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

.section-eyebrow {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-gold);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 300;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

/* ---------- Problema ---------- */
.problema-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.problema-card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    padding: var(--space-lg) var(--space-md);
    transition: border-color var(--duration) var(--ease-out);
}

.problema-card:hover {
    border-color: var(--color-grey);
}

.problema-icon {
    color: var(--color-gold);
    margin-bottom: var(--space-md);
}

.problema-card-title {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.problema-card p {
    font-size: 0.9375rem;
    color: var(--color-grey);
    line-height: 1.65;
}

/* ---------- Soluzione ---------- */
.section-soluzione {
    background-color: var(--color-dark-surface);
}

.soluzione-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.soluzione-lead {
    font-size: 1.25rem;
    font-weight: 300;
    line-height: 1.65;
    color: var(--color-grey);
    margin-top: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.soluzione-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.soluzione-features li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.feature-check {
    flex-shrink: 0;
    display: inline-block;
    width: 18px;
    height: 18px;
    margin-top: 3px;
    border: 1px solid var(--color-gold);
    position: relative;
}

.feature-check::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 5px;
    width: 5px;
    height: 9px;
    border: solid var(--color-gold);
    border-width: 0 1.5px 1.5px 0;
    transform: rotate(45deg);
}

/* Placeholder images */
.placeholder-image {
    aspect-ratio: 4 / 3;
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    color: var(--color-grey);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.placeholder-image--tall {
    aspect-ratio: 3 / 4;
}

/* ---------- Steps ---------- */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.step-card {
    padding: var(--space-lg) var(--space-md);
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    transition: border-color var(--duration) var(--ease-out);
}

.step-card:hover {
    border-color: var(--color-gold);
}

.step-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 400;
    color: var(--color-gold);
    line-height: 1;
    margin-bottom: var(--space-md);
}

.step-title {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.step-card p {
    font-size: 0.9375rem;
    color: var(--color-grey);
    line-height: 1.65;
}

/* ---------- Settori ---------- */
.settori-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.settore-card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: border-color var(--duration) var(--ease-out);
}

.settore-card:hover {
    border-color: var(--color-gold);
}

.settore-visual {
    aspect-ratio: 16 / 9;
    background-color: var(--color-black);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: var(--color-grey);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--color-border);
}

.settore-body {
    padding: var(--space-md);
}

.settore-body h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.settore-body p {
    font-size: 0.875rem;
    color: var(--color-grey);
    line-height: 1.6;
}

/* ---------- Numeri ---------- */
.section-numeri {
    background-color: var(--color-dark-surface);
}

.numeri-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    text-align: center;
}

.numero-card {
    padding: var(--space-xl) var(--space-md);
}

.numero-value {
    font-size: clamp(3rem, 7vw, 5rem);
    font-weight: 400;
    color: var(--color-gold);
    line-height: 1;
}

.numero-symbol {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--color-gold);
    vertical-align: top;
}

.numero-prefix {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--color-gold);
}

.numero-label {
    font-size: 0.9375rem;
    color: var(--color-grey);
    margin-top: var(--space-sm);
    line-height: 1.5;
}

/* ---------- Credibilita ---------- */
.credibilita-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.credibilita-content > p {
    font-size: 1.0625rem;
    color: var(--color-grey);
    line-height: 1.7;
    margin-top: var(--space-sm);
}

.credibilita-points {
    margin-top: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.credibilita-point h4 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.credibilita-point p {
    font-size: 0.9375rem;
    color: var(--color-grey);
    line-height: 1.6;
}

/* ---------- Contatti / Form ---------- */
.section-contatti {
    background-color: var(--color-dark-surface);
}

.contatti-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.contatti-header p {
    font-size: 1.0625rem;
    color: var(--color-grey);
    margin-top: var(--space-sm);
    line-height: 1.7;
}

.contatti-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-group--full {
    grid-column: 1 / -1;
}

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-grey);
    margin-bottom: var(--space-xs);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    color: var(--color-white);
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 0;
    outline: none;
    transition: border-color var(--duration) var(--ease-out);
    -webkit-appearance: none;
    appearance: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-grey);
    opacity: 0.5;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-gold);
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: #c0392b;
}

.form-group select {
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%238A8A8A' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--color-grey);
    line-height: 1.5;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 2px;
    accent-color: var(--color-gold);
}

.checkbox-label a {
    color: var(--color-gold);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.btn-submit {
    width: 100%;
}

.form-feedback {
    grid-column: 1 / -1;
    padding: var(--space-sm);
    font-size: 0.875rem;
    text-align: center;
}

.form-feedback.success {
    color: var(--color-gold);
    border: 1px solid var(--color-gold);
}

.form-feedback.error {
    color: #c0392b;
    border: 1px solid #c0392b;
}

/* ---------- Footer ---------- */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) 0 var(--space-lg);
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: var(--space-lg);
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-grey);
    margin-top: var(--space-xs);
    max-width: 260px;
}

.footer-col h4 {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-grey);
    margin-bottom: var(--space-sm);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-col a {
    font-size: 0.875rem;
    color: var(--color-grey);
}

.footer-col a:hover {
    color: var(--color-white);
}

.footer-bottom {
    grid-column: 1 / -1;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    font-size: 0.8125rem;
    color: var(--color-grey);
}

/* ---------- Reveal animation ---------- */
[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Responsive: Tablet (< 900px) ---------- */
@media (max-width: 56.25em) {
    .menu-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        height: 100vh;
        height: 100dvh;
        background-color: var(--color-dark-surface);
        border-left: 1px solid var(--color-border);
        padding: 5rem var(--space-md) var(--space-md);
        transform: translateX(100%);
        transition: transform var(--duration) var(--ease-out);
        z-index: 99;
    }

    .main-nav.open {
        transform: translateX(0);
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }

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

    .soluzione-layout,
    .credibilita-layout,
    .contatti-layout {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

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

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

    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }
}

/* ---------- Responsive: Mobile (< 600px) ---------- */
@media (max-width: 37.5em) {
    :root {
        --space-xl: 3.5rem;
        --space-2xl: 5rem;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-cta-group {
        flex-direction: column;
    }

    .hero-cta-group .btn {
        width: 100%;
        text-align: center;
    }

    .steps-grid,
    .settori-grid {
        grid-template-columns: 1fr;
    }

    .numeri-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .numero-card {
        padding: var(--space-lg) var(--space-md);
        border-bottom: 1px solid var(--color-border);
    }

    .numero-card:last-child {
        border-bottom: none;
    }

    .contatti-form {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        grid-template-columns: 1fr;
    }

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

/* ---------- Focus visible ---------- */
:focus-visible {
    outline: 2px solid var(--color-gold);
    outline-offset: 2px;
}

/* ---------- Selection ---------- */
::selection {
    background-color: var(--color-gold);
    color: var(--color-black);
}

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

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