/* ============================================================
   NEPTUNE ELEVATORS v2.0 — DESIGN SYSTEM
   CSS Custom Properties, Typography, Spacing, Grid Utilities
   Premium Industrial Elegance Design Language
   ============================================================ */

/* ----------------------------------------------------------
   1. COLOR SYSTEM
   Deep Navy + Gold/Brass + Warm Off-White
   Dark-first default, light mode toggle ready
   ---------------------------------------------------------- */
:root {
    /* Primary Palette */
    --navy-950: #050A14;
    --navy-900: #0A1628;
    --navy-800: #0F1F3A;
    --navy-700: #162A4D;
    --navy-600: #1E3A66;
    --navy-500: #2A5080;
    --navy-400: #4A7AB8;
    --navy-300: #7BA3D1;
    --navy-200: #A8C4E4;
    --navy-100: #D4E2F2;
    --navy-50:  #EDF3FA;

    /* Logo Cyan/Azure Accent — a darker, richer shade of the brand
       logo's cyan, tuned to stay legible against deep navy backgrounds */
    --gold-900: #001D28;
    --gold-800: #002F42;
    --gold-700: #004966;
    --gold-600: #006389;
    --gold-500: #0081B2;
    --gold-400: #00A2E0;
    --gold-300: #23C2FE;
    --gold-200: #6BD6FF;
    --gold-100: #B2E9FF;
    --gold-50:  #DBF5FF;

    /* Warm Neutrals — cleaner, crisper */
    --warm-950: #1A1814;
    --warm-900: #2D2A22;
    --warm-800: #454238;
    --warm-700: #5E5A4E;
    --warm-600: #787264;
    --warm-500: #928C7C;
    --warm-400: #A8A298;
    --warm-300: #C9C4BB;
    --warm-200: #DDD8D0;
    --warm-100: #EFEBE3;
    --warm-50:  #FAF8F4;

    /* Functional Colors */
    --success: #10B981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --warning: #F59E0B;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --error: #EF4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --info: #3B82F6;
    --info-bg: rgba(59, 130, 246, 0.1);

    /* Dark Mode (Default) */
    --bg-primary: var(--navy-950);
    --bg-secondary: var(--navy-900);
    --bg-tertiary: var(--navy-800);
    --bg-elevated: var(--navy-700);
    --bg-glass: rgba(10, 22, 40, 0.7);

    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.95);
    --text-tertiary: rgba(255, 255, 255, 0.82);
    --text-muted: rgba(255, 255, 255, 0.6);
    --text-inverse: var(--navy-950);

    --border-subtle: rgba(232, 228, 220, 0.08);
    --border-default: rgba(232, 228, 220, 0.15);
    --border-strong: rgba(232, 228, 220, 0.25);
    --border-gold: rgba(0, 147, 204, 0.3);

    --accent-primary: var(--gold-500);
    --accent-hover: var(--gold-400);
    --accent-active: var(--gold-600);
    --accent-glow: rgba(0, 147, 204, 0.18);

    /* Fixed light-text tokens for surfaces that are always dark regardless
       of site theme (topbar, footer, hero, page-header banners) — never
       redefined in [data-theme="light"], so they never go dark-on-dark. */
    --text-on-dark: #FFFFFF;
    --text-on-dark-secondary: rgba(255, 255, 255, 0.85);
    --text-on-dark-muted: rgba(255, 255, 255, 0.6);

    /* Noise texture overlay */
    --noise-opacity: 0.03;
}

/* Light Mode Override */
[data-theme="light"] {
    --bg-primary: var(--warm-50);
    --bg-secondary: #FFFFFF;
    --bg-tertiary: var(--warm-100);
    --bg-elevated: #FFFFFF;
    --bg-glass: rgba(245, 243, 239, 0.85);

    --text-primary: var(--navy-950);
    --text-secondary: var(--navy-700);
    --text-tertiary: var(--navy-600);
    --text-muted: var(--warm-600);
    --text-inverse: var(--warm-50);

    --border-subtle: rgba(10, 10, 20, 0.06);
    --border-default: rgba(10, 10, 20, 0.12);
    --border-strong: rgba(10, 10, 20, 0.2);
    --border-gold: rgba(0, 147, 204, 0.4);

    --accent-primary: var(--gold-600);
    --accent-hover: var(--gold-500);
    --accent-active: var(--gold-700);
    --accent-glow: rgba(0, 147, 204, 0.12);

    --noise-opacity: 0.02;
}

/* ----------------------------------------------------------
   2. TYPOGRAPHY SYSTEM
   Inter for body/headings, Space Mono for technical accents
   Viewport-scaled hero, clamp() for responsive fluidity
   ---------------------------------------------------------- */
:root {
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Space Mono', 'JetBrains Mono', 'Fira Code', monospace;

    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-black: 900;

    /* Fluid type scale using clamp() */
    --text-xs: clamp(0.6875rem, 0.65rem + 0.18vw, 0.75rem);      /* 11-12px */
    --text-sm: clamp(0.8125rem, 0.75rem + 0.31vw, 0.875rem);    /* 13-14px */
    --text-base: clamp(0.9375rem, 0.85rem + 0.44vw, 1rem);     /* 15-16px */
    --text-lg: clamp(1.0625rem, 0.95rem + 0.56vw, 1.125rem);  /* 17-18px */
    --text-xl: clamp(1.1875rem, 1rem + 0.94vw, 1.375rem);       /* 19-22px */
    --text-2xl: clamp(1.375rem, 1.1rem + 1.38vw, 1.75rem);      /* 22-28px */
    --text-3xl: clamp(1.625rem, 1.2rem + 2.13vw, 2.25rem);       /* 26-36px */
    --text-4xl: clamp(1.875rem, 1.25rem + 3.13vw, 3rem);          /* 30-48px */
    --text-5xl: clamp(2.25rem, 1.3rem + 4.75vw, 4rem);            /* 36-64px */
    --text-6xl: clamp(2.75rem, 1.4rem + 6.75vw, 5.5rem);          /* 44-88px */
    --text-7xl: clamp(3.5rem, 1.5rem + 10vw, 7.5rem);             /* 56-120px */

    /* Hero display — viewport scaled */
    --text-hero: clamp(3rem, 8vw + 1rem, 8rem);

    --leading-tight: 1.1;
    --leading-snug: 1.25;
    --leading-normal: 1.6;
    --leading-relaxed: 1.75;
    --leading-loose: 2;

    --tracking-tight: -0.03em;
    --tracking-normal: 0;
    --tracking-wide: 0.05em;
    --tracking-wider: 0.1em;
    --tracking-widest: 0.2em;
}

/* ----------------------------------------------------------
   3. SPACING SYSTEM
   Based on 0.25rem (4px) base unit
   ---------------------------------------------------------- */
:root {
    --space-0: 0;
    --space-px: 1px;
    --space-0-5: 0.125rem;   /* 2px */
    --space-1: 0.25rem;      /* 4px */
    --space-1-5: 0.375rem;  /* 6px */
    --space-2: 0.5rem;       /* 8px */
    --space-2-5: 0.625rem;   /* 10px */
    --space-3: 0.75rem;      /* 12px */
    --space-3-5: 0.875rem;   /* 14px */
    --space-4: 1rem;         /* 16px */
    --space-5: 1.25rem;      /* 20px */
    --space-6: 1.5rem;       /* 24px */
    --space-7: 1.75rem;      /* 28px */
    --space-8: 2rem;         /* 32px */
    --space-9: 2.25rem;      /* 36px */
    --space-10: 2.5rem;      /* 40px */
    --space-11: 2.75rem;     /* 44px */
    --space-12: 3rem;        /* 48px */
    --space-14: 3.5rem;      /* 56px */
    --space-16: 4rem;        /* 64px */
    --space-20: 5rem;        /* 80px */
    --space-24: 6rem;        /* 96px */
    --space-28: 7rem;        /* 112px */
    --space-32: 8rem;        /* 128px */
    --space-36: 9rem;        /* 144px */
    --space-40: 10rem;       /* 160px */
    --space-44: 11rem;       /* 176px */
    --space-48: 12rem;       /* 192px */
    --space-52: 13rem;       /* 208px */
    --space-56: 14rem;       /* 224px */
    --space-60: 15rem;       /* 240px */
    --space-64: 16rem;       /* 256px */
    --space-72: 18rem;       /* 288px */
    --space-80: 20rem;       /* 320px */
    --space-96: 24rem;       /* 384px */
}

/* ----------------------------------------------------------
   4. LAYOUT SYSTEM
   Container, Grid, Breakpoints
   ---------------------------------------------------------- */
:root {
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1440px;
    --container-max: 1600px;

    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1440px;

    --grid-columns: 12;
    --grid-gap: var(--space-6);
    --grid-gap-sm: var(--space-4);
    --grid-gap-lg: var(--space-8);

    --section-padding-y: var(--space-20);
    --section-padding-y-sm: var(--space-16);
    --section-padding-y-lg: var(--space-24);

    --page-padding-x: var(--space-6);
    --page-padding-x-sm: var(--space-4);
    --page-padding-x-lg: var(--space-12);
    --page-padding-x-xl: var(--space-16);
}

/* ----------------------------------------------------------
   5. BORDER & SHADOW SYSTEM
   Sharp, precise — no soft shadows (tactile brutalism)
   ---------------------------------------------------------- */
:root {
    --radius-none: 0;
    --radius-sm: 2px;
    --radius-default: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-2xl: 16px;
    --radius-full: 9999px;

    /* Shadows — minimal, sharp, directional */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-default: 0 2px 4px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.35), 0 2px 4px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.4), 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.45), 0 8px 16px rgba(0, 0, 0, 0.35);
    --shadow-gold: 0 0 20px rgba(0, 147, 204, 0.15), 0 0 40px rgba(0, 147, 204, 0.08);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.2);

    /* Light mode shadows */
    [data-theme="light"] {
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
        --shadow-default: 0 2px 4px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
        --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.08);
        --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.12), 0 4px 8px rgba(0, 0, 0, 0.1);
        --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.14), 0 8px 16px rgba(0, 0, 0, 0.12);
        --shadow-gold: 0 0 20px rgba(0, 147, 204, 0.1), 0 0 40px rgba(0, 147, 204, 0.05);
        --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.06);
    }
}

/* ----------------------------------------------------------
   6. Z-INDEX SCALE
   Organized layer system
   ---------------------------------------------------------- */
:root {
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;
    --z-loader: 900;
}

/* ----------------------------------------------------------
   7. TRANSITION SYSTEM
   Consistent timing for all interactions
   ---------------------------------------------------------- */
:root {
    --duration-instant: 0ms;
    --duration-fast: 100ms;
    --duration-normal: 200ms;
    --duration-slow: 300ms;
    --duration-slower: 500ms;
    --duration-slowest: 700ms;

    --ease-linear: linear;
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.45, 0.05, 0.55, 0.95);
    --ease-expo-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-expo-in: cubic-bezier(0.7, 0, 0.84, 0);
}

/* ----------------------------------------------------------
   8. UTILITY CLASSES
   Layout, Typography, Spacing helpers
   ---------------------------------------------------------- */

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--page-padding-x);
    padding-right: var(--page-padding-x);
}

@media (min-width: 640px) {
    .container {
        padding-left: var(--page-padding-x-sm);
        padding-right: var(--page-padding-x-sm);
    }
}

@media (min-width: 1024px) {
    .container {
        padding-left: var(--page-padding-x-lg);
        padding-right: var(--page-padding-x-lg);
    }
}

@media (min-width: 1440px) {
    .container {
        padding-left: var(--page-padding-x-xl);
        padding-right: var(--page-padding-x-xl);
    }
}

/* Container variants */
.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-xl { max-width: var(--container-xl); }
.container-2xl { max-width: var(--container-2xl); }

/* Section padding */
.section {
    padding-top: var(--section-padding-y);
    padding-bottom: var(--section-padding-y);
}

@media (min-width: 1024px) {
    .section {
        padding-top: var(--section-padding-y-lg);
        padding-bottom: var(--section-padding-y-lg);
    }
}

/* Section variants */
.section-sm { padding-top: var(--section-padding-y-sm); padding-bottom: var(--section-padding-y-sm); }
.section-lg { padding-top: var(--section-padding-y-lg); padding-bottom: var(--section-padding-y-lg); }

/* Grid system */
.grid {
    display: grid;
    gap: var(--grid-gap);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

@media (min-width: 640px) {
    .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
    .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .lg\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
    .lg\:grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* Flex utilities */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-12 { gap: var(--space-12); }

/* Text alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* 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;
}

/* Noise texture overlay for tactile depth */
.noise-overlay::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: var(--noise-opacity);
    pointer-events: none;
    z-index: 1;
}

.noise-overlay > * {
    position: relative;
    z-index: 2;
}

/* Gold accent line */
.gold-line {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--gold-500), var(--gold-300));
}

.gold-line-lg {
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--gold-500), var(--gold-300));
}

/* Section label (uppercase, tracked, gold) */
.section-label {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    letter-spacing: var(--tracking-widest);
    text-transform: uppercase;
    color: var(--accent-primary);
}

/* Gold separator for headings */
.heading-separator {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.heading-separator::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--border-gold), transparent);
    max-width: 120px;
}