/* ==========================================================================
   StudiopaisTool — design tokens (palette fintech teal/slate, coerente con
   gli strumenti già pubblicati) + componenti condivisi
   ========================================================================== */
:root,
[data-theme='light'] {
  --color-bg: #eef2f5;
  --color-surface: #ffffff;
  --color-surface-2: #f7f9fa;
  --color-surface-offset: #e7edf0;
  --color-surface-offset-2: #dfe7eb;
  --color-divider: #dde5e9;
  --color-border: #cdd8dd;

  --color-text: #10202a;
  --color-text-muted: #556973;
  --color-text-faint: #8fa0a8;
  --color-text-inverse: #f4f8f9;

  --color-primary: #0c6e64;
  --color-primary-hover: #085650;
  --color-primary-active: #063e3a;
  --color-primary-highlight: #d7e6e2;

  --color-success: #2f7d4f;
  --color-success-highlight: #dcece2;
  --color-warning: #92531e;
  --color-warning-highlight: #ecdccb;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 220 / 0.06);
  --shadow-md: 0 6px 20px oklch(0.2 0.02 220 / 0.08);
  --shadow-lg: 0 16px 40px oklch(0.2 0.02 220 / 0.14);

  --font-display: 'Cabinet Grotesk', 'Satoshi', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  --transition-interactive: 160ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1120px;
}

[data-theme='dark'] {
  --color-bg: #0e1417;
  --color-surface: #151c20;
  --color-surface-2: #1a2226;
  --color-surface-offset: #1e2731;
  --color-surface-offset-2: #232f38;
  --color-divider: #263038;
  --color-border: #33414a;

  --color-text: #dfe7ea;
  --color-text-muted: #8fa0a8;
  --color-text-faint: #5c6b73;
  --color-text-inverse: #10171a;

  --color-primary: #4bb5a8;
  --color-primary-hover: #6cc7bc;
  --color-primary-active: #83d2c8;
  --color-primary-highlight: #1f3733;

  --color-success: #6fbf8b;
  --color-success-highlight: #1e332a;
  --color-warning: #d99a5f;
  --color-warning-highlight: #3a2c1c;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 20px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 16px 40px oklch(0 0 0 / 0.5);
}

/* Type scale */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.3rem + 2.2vw, 3.25rem);
}

/* Spacing */
:root {
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: color-mix(in oklab, var(--color-primary) 40%, transparent);
}
a:hover {
  color: var(--color-primary-hover);
}

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.container--narrow {
  max-width: var(--content-narrow);
}
.container--default {
  max-width: var(--content-default);
}

/* ==========================================================================
   Header / nav
   ========================================================================== */
.site-header {
  border-bottom: 1px solid var(--color-divider);
  background: color-mix(in oklab, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 40;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}
.brand:hover {
  color: var(--color-text);
}
.brand-mark {
  color: var(--color-primary);
  flex-shrink: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  letter-spacing: -0.01em;
}
.brand-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}
.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
}
.nav-links a:hover,
.nav-links a[aria-current='page'] {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle,
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  flex-shrink: 0;
}
.theme-toggle:hover,
.nav-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}
.nav-toggle {
  display: none;
}

@media (max-width: 760px) {
  .main-nav {
    position: fixed;
    inset: 68px var(--space-4) auto var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-5);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--transition-interactive),
      transform var(--transition-interactive),
      visibility var(--transition-interactive);
  }
  .main-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }
  .nav-toggle {
    display: flex;
  }
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
}
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-ghost {
  color: var(--color-primary);
  padding-inline: var(--space-2);
}
.btn-ghost:hover {
  color: var(--color-primary-hover);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24)) clamp(var(--space-12), 6vw, var(--space-20));
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-16);
  align-items: center;
}
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}
.hero h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-6);
  max-width: 20ch;
}
.hero-lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-bottom: var(--space-8);
  font-weight: 400;
}
.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}
.hero-stats {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.hero-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.hero-stat strong {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-primary);
}
.hero-stat span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.hero-visual {
  position: relative;
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section {
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}
.section-alt {
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}
.section-head {
  max-width: 640px;
  margin-bottom: var(--space-10);
}
.section-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  display: block;
}
.section-head h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}
.section-head p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* ==========================================================================
   Tool cards
   ========================================================================== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
@media (max-width: 980px) {
  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 640px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: var(--color-text);
  height: 100%;
}
.tool-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}
.tool-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  flex-shrink: 0;
}
.tool-card-badge {
  display: inline-flex;
  align-self: flex-start;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-success);
  background: var(--color-success-highlight);
  padding: 0.2em 0.7em;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}
.tool-card-badge.badge-external {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}
.tool-card-badge.badge-soon {
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
}
.tool-card h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
}
.tool-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  flex-grow: 1;
  margin-bottom: var(--space-6);
}
.tool-card-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}
.tool-card.tool-card-soon {
  border-style: dashed;
  background: transparent;
  box-shadow: none;
  align-items: center;
  text-align: center;
  justify-content: center;
}
.tool-card.tool-card-soon:hover {
  transform: none;
  border-color: var(--color-border);
  box-shadow: none;
}
.tool-card.tool-card-soon .tool-card-icon {
  background: var(--color-surface-offset);
  color: var(--color-text-faint);
  margin-inline: auto;
}
.tool-card.tool-card-soon h3 {
  color: var(--color-text-muted);
}

/* ==========================================================================
   Feature / trust grid
   ========================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}
@media (max-width: 900px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}
.feature {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.feature-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-2);
}
.feature h3 {
  font-size: var(--text-base);
  font-weight: 700;
}
.feature p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Author / about strip
   ========================================================================== */
.author-strip {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}
@media (max-width: 760px) {
  .author-strip {
    grid-template-columns: 1fr;
    text-align: center;
  }
}
.author-avatar {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  flex-shrink: 0;
}
@media (max-width: 760px) {
  .author-avatar {
    margin-inline: auto;
  }
}
.author-strip h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}
.author-strip p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Sponsor / ad placeholder
   ========================================================================== */
.ad-slot {
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  text-align: center;
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  min-height: 96px;
  background: color-mix(in oklab, var(--color-surface-2) 60%, transparent);
}

/* ==========================================================================
   Callout / CTA band
   ========================================================================== */
.cta-band {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl);
  padding: var(--space-12) var(--space-10);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}
@media (max-width: 760px) {
  .cta-band {
    flex-direction: column;
    text-align: center;
    padding: var(--space-10) var(--space-6);
  }
}
.cta-band h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.cta-band p {
  color: color-mix(in oklab, var(--color-text-inverse) 80%, transparent);
  font-size: var(--text-base);
}
.cta-band .btn-secondary {
  background: var(--color-text-inverse);
  color: var(--color-primary);
  border-color: transparent;
  flex-shrink: 0;
}
.cta-band .btn-secondary:hover {
  background: color-mix(in oklab, var(--color-text-inverse) 90%, transparent);
}

/* ==========================================================================
   Page header (interior pages)
   ========================================================================== */
.page-hero {
  padding-block: var(--space-16) var(--space-10);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface-2);
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}
.breadcrumb a {
  color: var(--color-text-faint);
  text-decoration: none;
}
.breadcrumb a:hover {
  color: var(--color-primary);
}
.page-hero h1 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}
.page-hero p {
  color: var(--color-text-muted);
  max-width: 640px;
}

/* ==========================================================================
   Legal / long-form content
   ========================================================================== */
.legal-content {
  padding-block: var(--space-12) var(--space-20);
  max-width: var(--content-narrow);
  margin-inline: auto;
}
.legal-content h2 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-top: var(--space-10);
  margin-bottom: var(--space-3);
}
.legal-content h2:first-child {
  margin-top: 0;
}
.legal-content p {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}
.legal-content ul {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
  color: var(--color-text-muted);
}
.legal-content li {
  margin-bottom: var(--space-2);
}
.legal-content strong {
  color: var(--color-text);
}
.legal-updated {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-8);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface-2);
  padding-block: var(--space-16) var(--space-8);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}
@media (max-width: 760px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}
.footer-brand p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-4);
  max-width: 32ch;
}
.footer-col h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  list-style: none;
}
.footer-col a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-col a:hover {
  color: var(--color-primary);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-8);
  flex-wrap: wrap;
}
.footer-bottom p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ==========================================================================
   Utility
   ========================================================================== */
.text-muted {
  color: var(--color-text-muted);
}
.mt-0 {
  margin-top: 0;
}