/* ============================================================
   DiveLog UI Design System — Design Tokens v3.0
   Fonte: design-token.md Appendice A
   ============================================================ */
:root {
  /* Typography */
  --font-family-primary: "Roboto","Arial",sans-serif;
  --font-display-large: 3.5rem;
  --font-display-medium: 2.8rem;
  --font-headline-large: 2rem;
  --font-headline-medium: 1.75rem;
  --font-title-large: 1.375rem;
  --font-title-medium: 1rem;
  --font-body-large: 1rem;
  --font-body-medium: 0.875rem;
  --font-label-large: 0.875rem;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-bold: 700;

  /* Spacing */
  --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;

  /* Layout */
  --content-max-width: 1440px;
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 72px;
  --header-height: 64px;

  /* Border Radius */
  --radius-small: 0.25rem;
  --radius-medium: 0.75rem;
  --radius-large: 1rem;
  --radius-extra-large: 1.75rem;
  --radius-pill: 999px;

  /* Motion */
  --motion-fast: 120ms;
  --motion-medium: 200ms;
  --motion-slow: 300ms;
  --ease-standard: cubic-bezier(0.2,0,0,1);
  --ease-emphasized: cubic-bezier(0.2,0,0,1.2);

  /* Z-Index */
  --z-base: 1;
  --z-header: 100;
  --z-sidebar: 200;
  --z-dropdown: 300;
  --z-modal: 400;
  --z-toast: 500;

  /* Semantic Colors */
  --color-success: #2E7D32;
  --color-warning: #ED6C02;
  --color-error: #BA1A1A;
  --color-info: #00639B;
}

/* Light Theme */
[data-theme="light"] {
  --color-background: #FAFDFD;
  --color-surface: #FFFFFF;
  --color-surface-container: #EEF1F1;
  --color-text-primary: #191C1C;
  --color-text-secondary: #414747;
  --color-border: #717878;
  --color-primary: #006A6A;
  --color-primary-container: #6FF7F5;
  --color-secondary: #4A6363;
  --color-secondary-container: #CCE8E7;
  --color-tertiary: #4B607C;
  --color-on-primary: #FFFFFF;
  --color-on-surface: #191C1C;
  --color-on-error: #FFFFFF;
  --shadow-low: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-medium: 0 4px 8px rgba(0,0,0,0.16);
  --shadow-high: 0 8px 24px rgba(0,0,0,0.20);
  --surface-glass: rgba(255, 255, 255, 0.85);
  --surface-glass-border: rgba(25, 28, 28, 0.10);
  --photo-overlay-1: rgba(250, 253, 253, 0.15);
  --photo-overlay-2: rgba(250, 253, 253, 0.55);
  --photo-overlay-3: rgba(250, 253, 253, 0.92);
}

/* Dark Theme */
[data-theme="dark"] {
  --color-background: #111414;
  --color-surface: #191C1C;
  --color-surface-container: #1D2020;
  --color-text-primary: #E1E3E3;
  --color-text-secondary: #C4C7C7;
  --color-border: #424747;
  --color-primary: #4CDAD8;
  --color-primary-container: #003737;
  --color-secondary: #B0CCCC;
  --color-secondary-container: #324B4B;
  --color-tertiary: #B3C8E8;
  --color-on-primary: #003737;
  --color-on-surface: #E1E3E3;
  --color-on-error: #690005;
  --shadow-low: 0 1px 3px rgba(255,255,255,0.08);
  --shadow-medium: 0 4px 8px rgba(255,255,255,0.12);
  --shadow-high: 0 8px 24px rgba(255,255,255,0.16);
  --surface-glass: rgba(25, 28, 28, 0.75);
  --surface-glass-border: rgba(255, 255, 255, 0.10);
  --photo-overlay-1: rgba(3, 19, 48, 0.15);
  --photo-overlay-2: rgba(3, 19, 48, 0.55);
  --photo-overlay-3: rgba(3, 19, 48, 0.92);
}

/* Component Tokens */
:root {
  --button-height: 40px;
  --button-radius: var(--radius-large);
  --button-primary-background: var(--color-primary);
  --button-primary-text: var(--color-on-primary);
}

/* ── Global Base Styles ── */
/* Applica i token tipografici e cromatici all'intero documento.
   Questo garantisce che il font Roboto (e fallback Arial) sia attivo
   su TUTTE le pagine, non solo su quelle che importano splash-page.css.
   Fonte: design-token.md §6, SKILL.md §6 */
body {
  font-family: var(--font-family-primary);
  background: var(--color-background);
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
}

/* ── Form Row ── */
.form-row {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}
.form-row > * {
  flex: 1;
  min-width: 0;
}

/* ── Form Row — 3 colonne ── */
.form-row--3 {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.form-row--3 > * {
  flex: 1;
  min-width: 0;
}

.form-row--3 > *:first-child {
  flex: 0.6;
}

@media (max-width: 599px) {
  .form-row,
  .form-row--tre,
  .form-row--3 {
    flex-direction: column;
    gap: 0;
  }
}

/* ── Divider ── */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-4) 0;
}

/* ── Utility: Skip Link (accessibilità) ── */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-2) var(--space-4);
  z-index: var(--z-toast);
  text-decoration: none;
  font-weight: var(--weight-medium);
  border-radius: 0 0 var(--radius-medium) 0;
  transition: top var(--motion-fast) var(--ease-standard);
}
.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* ── Utility: Visually Hidden (screen reader only) ── */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Utility: Text meta (metadata secondario condiviso cross-page) ── */
.text-meta {
  font-size: var(--font-body-medium);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

/* Theme transition */
*, *::before, *::after {
  transition: background-color var(--motion-medium) var(--ease-standard),
              color var(--motion-medium) var(--ease-standard),
              border-color var(--motion-medium) var(--ease-standard);
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}