/**
 * NextStep Design System
 * Unified design language for Web & iOS
 */

:root {
    /* ------------------------------------------------------------
       PREMIUM BLUE PALETTE (royal -> navy)
       - Scala calibrata per luce+contrasto in stile SaaS premium
       - Il blu resta centrale, ma piu saturo e profondo del vecchio
         pastello #6EA8FF (che tendeva al "friendly").
       ------------------------------------------------------------ */
    --primary: #2563EB;             /* Royal blue - CTA, brand */
    --primary-hover: #1D4ED8;       /* Hover piu profondo */
    --primary-active: #1E40AF;      /* Pressed / focus */
    --primary-deep: #1E3A8A;        /* Navy per gradient/accenti */
    --primary-soft: #EFF4FF;        /* Sfondo tinted leggero */
    --primary-light: rgba(37, 99, 235, 0.10);
    --primary-gradient: linear-gradient(135deg, #2563EB 0%, #1E3A8A 100%);
    --primary-color: #2563EB;       /* Alias retro-compatibilita */
    --primary-rgb: 37, 99, 235;     /* Per rgba() dinamici */

    /* Secondary = blu leggermente piu chiaro, per accenti e hover interni */
    --secondary: #3B82F6;
    --secondary-hover: #2563EB;

    /* Accent premium (uso parsimonioso) */
    --accent-pink: #F472B6;
    --accent-gold: #D4A84B;         /* Oro piu sobrio, non carnevale */
    --accent-purple: #6D5BD0;       /* Indaco, meglio abbinato al royal blue */

    /* Semantic Colors (toni piu desaturati per look premium) */
    --success: #059669;
    --warning: #D97706;
    --error: #DC2626;
    --info: #2563EB;

    /* Neutral (slate con undertone freddo) */
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;

    /* Text (undertone navy per coerenza col blu) */
    --text-primary: #0B1F3A;        /* Near-black con undertone blu */
    --text-secondary: #475569;
    --text-tertiary: #64748B;
    --text-muted: #94A3B8;
    --text-inverse: #FFFFFF;

    /* Background: mantengo la beige calda (identita distintiva)
       ma affianco una surface neutra cool per contrasto con il royal blue. */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F3F2EE;        /* Beige caldo (mantenuto) */
    --bg-tertiary: #EDEBE5;         /* Beige piu profondo */
    --surface-elevated: #FFFFFF;
    --surface: #F8FAFC;             /* Cool neutral per pannelli */
    --surface-raised: #FFFFFF;

    /* Borders (hairline con leggero undertone) */
    --border-color: #E2E8F0;
    --border-subtle: rgba(11, 31, 58, 0.06);
    --border-strong: rgba(11, 31, 58, 0.12);
    --doc-bg: #ffffff;
    --doc-text: #1f2937;
    --doc-border: #d1d5db;

    /* Radius — leggermente piu generosi per look premium */
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 18px;
    --border-radius-xl: 24px;
    --border-radius-2xl: 32px;
    --border-radius-full: 9999px;
    
    /* Spacing Scale (8px base) */
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-5: 1.25rem;  /* 20px */
    --space-6: 1.5rem;   /* 24px */
    --space-8: 2rem;     /* 32px */
    --space-10: 2.5rem;  /* 40px */
    --space-12: 3rem;    /* 48px */
    --space-16: 4rem;    /* 64px */
    
    /* ------------------------------------------------------------
       TYPOGRAPHY
       - Manrope come display/body (gia caricata in base.html)
       - Inter come fallback grottesco geometrico
       - Stack Apple nativo per fallback estetico
       ------------------------------------------------------------ */
    --font-sans: 'Manrope', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-display: 'Manrope', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', 'JetBrains Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;

    /* Scala tipografica (fluid-friendly, type scale ~1.25 major third) */
    --text-xs: 0.75rem;     /* 12px */
    --text-sm: 0.875rem;    /* 14px */
    --text-base: 1rem;      /* 16px */
    --text-lg: 1.0625rem;   /* 17px - body comfort */
    --text-xl: 1.25rem;     /* 20px */
    --text-2xl: 1.5rem;     /* 24px */
    --text-3xl: 1.875rem;   /* 30px */
    --text-4xl: 2.25rem;    /* 36px */
    --text-5xl: 3rem;       /* 48px */
    --text-6xl: 3.75rem;    /* 60px - hero display */

    /* Line heights calibrate per leggibilita premium */
    --leading-tight: 1.15;
    --leading-snug: 1.35;
    --leading-normal: 1.55;
    --leading-relaxed: 1.7;

    /* Letter spacing (headings = tight, body = normale, eyebrow = wide) */
    --tracking-tighter: -0.025em;
    --tracking-tight: -0.015em;
    --tracking-normal: 0em;
    --tracking-wide: 0.04em;
    --tracking-wider: 0.08em;
    --tracking-widest: 0.12em;

    /* Font Weights (Manrope supporta 400-800) */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    --font-black: 900;

    /* Font features per look tipografico curato
       (cifre tabulari per metriche, alternate stilistiche di Manrope) */
    --font-feature-default: 'cv11' on, 'ss01' on, 'ss03' on;
    --font-feature-tabular: 'tnum' on, 'lnum' on;

    /* ------------------------------------------------------------
       SHADOWS (layered + tinted con navy #0B1F3A)
       - Ombre colorate = percezione di depth piu morbida e premium
       - 2 layer (ambient + key light) come in Material/Stripe
       ------------------------------------------------------------ */
    --shadow-xs: 0 1px 2px 0 rgba(11, 31, 58, 0.04);
    --shadow-sm: 0 1px 2px rgba(11, 31, 58, 0.04), 0 1px 3px rgba(11, 31, 58, 0.04);
    --shadow-md: 0 4px 8px -2px rgba(11, 31, 58, 0.06), 0 2px 4px -2px rgba(11, 31, 58, 0.04);
    --shadow-lg: 0 10px 20px -4px rgba(11, 31, 58, 0.08), 0 4px 8px -4px rgba(11, 31, 58, 0.05);
    --shadow-xl: 0 20px 32px -8px rgba(11, 31, 58, 0.10), 0 8px 16px -8px rgba(11, 31, 58, 0.06);
    --shadow-2xl: 0 32px 64px -16px rgba(11, 31, 58, 0.18), 0 16px 32px -8px rgba(11, 31, 58, 0.08);

    /* Glow tinto col primary (per CTA, focus ring, spotlight) */
    --shadow-glow-primary: 0 10px 32px -4px rgba(37, 99, 235, 0.30), 0 4px 12px -2px rgba(37, 99, 235, 0.20);
    --shadow-glow-primary-sm: 0 4px 14px -2px rgba(37, 99, 235, 0.25);

    /* Inset highlight per superfici elevate (effetto vetro) */
    --shadow-inner-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.6);
    --shadow-ring-focus: 0 0 0 4px rgba(37, 99, 235, 0.18);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ============================================================
   BASE TYPOGRAPHY — applicata globalmente per look premium
   - Font smoothing, kerning, feature settings, tracking
   ============================================================ */
html {
    font-feature-settings: var(--font-feature-default);
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    font-feature-settings: var(--font-feature-default);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    letter-spacing: -0.005em;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-tight);
    line-height: var(--leading-tight);
    color: var(--text-primary);
}

h1 { letter-spacing: var(--tracking-tighter); font-weight: var(--font-extrabold); }
h2 { letter-spacing: var(--tracking-tighter); }

/* Display utility: per hero/titoli piu d'impatto */
.display-1, .display-2, .display-3 {
    font-family: var(--font-display);
    font-weight: var(--font-extrabold);
    letter-spacing: var(--tracking-tighter);
    line-height: var(--leading-tight);
}

/* Eyebrow / kicker — maiuscoletto sopra i titoli */
.eyebrow {
    font-size: var(--text-xs);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-widest);
    text-transform: uppercase;
    color: var(--primary);
}

/* Numeri metrici → cifre tabulari per allineamento perfetto */
.tabular-nums,
.metric-value,
[data-tabular-nums] {
    font-feature-settings: var(--font-feature-default), var(--font-feature-tabular);
    font-variant-numeric: tabular-nums;
}

/* Link: underline-offset pulito */
a {
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
}

/* Selezione testo col brand */
::selection {
    background: rgba(var(--primary-rgb), 0.18);
    color: var(--text-primary);
}

/* Scrollbar sottile su WebKit (look premium) */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(11, 31, 58, 0.18);
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(11, 31, 58, 0.28);
    background-clip: content-box;
    border: 2px solid transparent;
}

/* Utility Classes */

/* Gradients */
.gradient-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
}

.gradient-secondary {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent-purple) 100%);
}

.gradient-accent {
    background: linear-gradient(135deg, var(--accent-pink) 0%, var(--accent-gold) 100%);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

/* ============================================================
   BUTTONS — gradient sottile + ombra tinted per premium feel
   ============================================================ */
.btn-primary {
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: #fff;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--border-radius-md);
    font-family: var(--font-sans);
    font-weight: var(--font-semibold);
    letter-spacing: -0.005em;
    border: 1px solid rgba(255, 255, 255, 0.14);
    cursor: pointer;
    box-shadow: var(--shadow-glow-primary-sm), var(--shadow-inner-highlight);
    transition: transform var(--transition-fast), box-shadow var(--transition-base), background var(--transition-base);
}

.btn-primary:hover {
    background: linear-gradient(180deg, var(--primary-hover) 0%, var(--primary-active) 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow-primary);
    color: #fff;
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-glow-primary-sm);
}

.btn-primary:focus-visible {
    outline: none;
    box-shadow: var(--shadow-glow-primary-sm), var(--shadow-ring-focus);
}

.btn-secondary {
    background: var(--surface-raised);
    color: var(--text-primary);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--border-radius-md);
    font-family: var(--font-sans);
    font-weight: var(--font-semibold);
    letter-spacing: -0.005em;
    border: 1px solid var(--border-color);
    cursor: pointer;
    box-shadow: var(--shadow-xs);
    transition: all var(--transition-base);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.btn-secondary:focus-visible {
    outline: none;
    box-shadow: var(--shadow-ring-focus);
    border-color: var(--primary);
}

/* ============================================================
   CARDS — elevation multi-layer + hairline border
   ============================================================ */
.card-elevated {
    background: var(--surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}

.card-elevated:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--border-strong);
    transform: translateY(-3px);
}

/* ============================================================
   BADGES
   ============================================================ */
.badge-primary {
    display: inline-flex;
    align-items: center;
    background: rgba(var(--primary-rgb), 0.10);
    color: var(--primary);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--border-radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    border: 1px solid rgba(var(--primary-rgb), 0.18);
}

.badge-premium {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, #D4A84B 0%, #E5BE5C 100%);
    color: #1F1408;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--border-radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    box-shadow: 0 2px 8px rgba(212, 168, 75, 0.35);
}

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

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease;
}

.animate-slide-in {
    animation: slideIn 0.3s ease;
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ========================================
   DARK MODE - Complete Implementation
   ======================================== */

[data-theme="dark"] {
    /* Primary in dark: piu chiaro per contrasto, stesso DNA royal */
    --primary: #6B8FFF;             /* Azzurro brillante su fondo scuro */
    --primary-hover: #88A3FF;
    --primary-active: #A1B6FF;
    --primary-deep: #3B62E6;
    --primary-soft: rgba(107, 143, 255, 0.14);
    --primary-light: rgba(107, 143, 255, 0.20);
    --primary-gradient: linear-gradient(135deg, #6B8FFF 0%, #3B62E6 100%);
    --primary-color: #6B8FFF;
    --primary-rgb: 107, 143, 255;

    --secondary: #88A3FF;
    --secondary-hover: #A1B6FF;

    /* Testo: bianco leggermente warm, mai puro #fff */
    --text-primary: #F1F5FB;
    --text-secondary: #C7D2DF;
    --text-tertiary: #8FA0B3;
    --text-muted: #6B7A8E;
    --text-inverse: #0B1F3A;

    /* Superfici: navy profondo, non grigio puro (feel premium) */
    --bg-primary: #0A1220;          /* Fondo piu profondo */
    --bg-secondary: #0F1A2D;
    --bg-tertiary: #142238;         /* Card elevate */
    --surface-elevated: #122038;
    --surface: #0A1220;
    --surface-raised: #142238;

    /* Bordi hairline con undertone chiaro */
    --border-color: rgba(148, 163, 184, 0.18);
    --border-subtle: rgba(148, 163, 184, 0.10);
    --border-strong: rgba(148, 163, 184, 0.28);
    --doc-bg: #101a2c;
    --doc-text: #dbe4f0;
    --doc-border: rgba(148, 163, 184, 0.3);

    /* Ombre dark: piu profonde, sempre con undertone navy */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px -2px rgba(0, 0, 0, 0.45), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 20px -4px rgba(0, 0, 0, 0.55), 0 4px 8px -4px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 32px -8px rgba(0, 0, 0, 0.65), 0 8px 16px -8px rgba(0, 0, 0, 0.5);
    --shadow-2xl: 0 32px 64px -16px rgba(0, 0, 0, 0.75), 0 16px 32px -8px rgba(0, 0, 0, 0.5);

    --shadow-glow-primary: 0 10px 32px -4px rgba(107, 143, 255, 0.45), 0 4px 12px -2px rgba(107, 143, 255, 0.30);
    --shadow-glow-primary-sm: 0 4px 14px -2px rgba(107, 143, 255, 0.35);

    --shadow-inner-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.06);
    --shadow-ring-focus: 0 0 0 4px rgba(107, 143, 255, 0.30);
}

/* Dark Mode Component Overrides */
[data-theme="dark"] .btn-primary {
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-deep) 100%);
    color: #0A1220; /* Testo scuro su azzurro brillante per contrasto max */
    border-color: rgba(255, 255, 255, 0.10);
    box-shadow: var(--shadow-glow-primary-sm);
}

[data-theme="dark"] .btn-primary:hover {
    background: linear-gradient(180deg, var(--primary-hover) 0%, var(--primary) 100%);
    color: #0A1220;
    box-shadow: var(--shadow-glow-primary);
}

[data-theme="dark"] .btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

[data-theme="dark"] .btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
    color: var(--primary);
}

[data-theme="dark"] .card-elevated {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .card-elevated:hover {
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

[data-theme="dark"] .badge-primary {
    background: rgba(var(--primary-rgb), 0.18);
    color: var(--primary);
    border-color: rgba(var(--primary-rgb), 0.32);
}

[data-theme="dark"] .gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Dark Mode Form Elements */
[data-theme="dark"] input,
[data-theme="dark"] textarea,
[data-theme="dark"] select {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus {
    background-color: var(--bg-tertiary);
    border-color: var(--primary);
    outline: none;
    box-shadow: var(--shadow-ring-focus);
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
    color: var(--text-tertiary);
}

/* Dark Mode Links */
[data-theme="dark"] a {
    color: var(--primary);
}

[data-theme="dark"] a:hover {
    color: var(--primary-hover);
}

/* Dark Mode Code/Pre */
[data-theme="dark"] code,
[data-theme="dark"] pre {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --text-3xl: 1.5rem;
        --text-4xl: 1.875rem;
        --text-5xl: 2.25rem;
    }
    
    [data-theme="dark"] {
        /* Mobile dark mode adjustments if needed */
    }
}