/* ============================================
   TECHPOOL — Global Design Language System
   ============================================
   Shared tokens, reset, navigation, and footer.
   Each page links to this file and adds its own
   page-specific styles in a local <style> block.
   ============================================ */

/* ===== DLS DESIGN TOKENS ===== */
:root {
    /* ---- Primitive Color Tokens ---- */
    --color-red-500: #F50F3C;
    --color-red-600: #D62839;
    --color-red-400: #FF4D6A;
    --color-red-100: #FFF0F3;
    --color-red-50: #FFF8F9;

    --color-navy-900: #0C0C14;
    --color-navy-800: #141420;
    --color-navy-700: #1A1A28;
    --color-navy-600: #242436;
    --color-navy-500: #2E2E44;
    --color-navy-400: #454560;
    --color-navy-300: #6B6B88;
    --color-navy-200: #9898B0;
    --color-navy-100: #C8C8D8;

    --color-white: #FFFFFF;
    --color-gray-50: #FAFBFC;
    --color-gray-100: #F2F3F5;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;

    --color-green-500: #22C55E;

    /* ---- Semantic Tokens (default — light surfaces) ---- */
    --bg-primary: var(--color-white);
    --bg-secondary: var(--color-gray-50);
    --bg-inverse: var(--color-navy-900);

    --text-primary: var(--color-gray-900);
    --text-secondary: var(--color-gray-600);
    --text-tertiary: var(--color-gray-400);
    --text-inverse: var(--color-white);
    --text-brand: var(--color-red-500);

    --border-default: var(--color-gray-200);
    --border-subtle: var(--color-gray-100);

    --surface-elevated: var(--color-white);

    --interactive-primary: var(--color-red-500);
    --interactive-primary-hover: var(--color-red-600);

    /* ---- Typography Scale — DLS ---- */
    --text-hero: 64px;
    --text-hero-weight: 800;
    --text-hero-line-height: 1.0;
    --text-hero-tracking: -3.0px;

    --text-h1: 44px;
    --text-h1-weight: 700;
    --text-h1-line-height: 1.1;
    --text-h1-tracking: -2.0px;

    --text-h2: 32px;
    --text-h2-weight: 700;
    --text-h2-line-height: 1.15;
    --text-h2-tracking: -1.5px;

    --text-h3: 24px;
    --text-h3-weight: 600;
    --text-h3-line-height: 1.25;
    --text-h3-tracking: -1.0px;

    --text-h4: 20px;
    --text-h4-weight: 600;
    --text-h4-line-height: 1.3;
    --text-h4-tracking: -0.6px;

    --text-body-lg: 18px;
    --text-body: 16px;
    --text-body-sm: 14px;
    --text-caption: 12px;

    /* ---- Spacing (4px base grid) — DLS ---- */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;

    /* ---- Border Radius — DLS ---- */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* ---- Shadows — DLS ---- */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-paper: 0 24px 48px -12px rgba(0, 0, 0, 0.25);
}


/* ===== RESET ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: var(--text-body);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--color-navy-900);
    -webkit-font-smoothing: antialiased;
}


/* ===== LAYOUT ===== */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--space-8);
}


/* ===== NAVIGATION ===== */
nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: linear-gradient(170deg, var(--color-navy-900) 0%, var(--color-navy-800) 100%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: var(--space-4) 0;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav-logo img {
    height: 22px;
    width: auto;
    object-fit: contain;
}

.nav-links {
    display: flex;
    gap: var(--space-8);
    list-style: none;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-navy-200);
    font-weight: 500;
    font-size: 13px;
    transition: color 0.2s ease;
}

.nav-links a:hover { color: var(--color-white); }
.nav-links a.active { color: var(--color-white); }

.nav-buttons {
    display: flex;
    gap: var(--space-3);
    align-items: center;
    justify-self: end;
}

.nav-btn-login {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-navy-200);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: color 0.2s ease;
    font-family: inherit;
}

.nav-btn-login:hover { color: var(--color-white); }

.nav-btn-cta {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-5);
    font-size: var(--text-caption);
    font-weight: 600;
    color: var(--color-white);
    background: var(--interactive-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.nav-btn-cta:hover { background: var(--interactive-primary-hover); }

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}
.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: rgba(255,255,255,0.8);
    border-radius: 2px;
    transition: all 0.3s ease;
}
/* Animate to X when open */
nav.open .hamburger span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
nav.open .hamburger span:nth-child(2) { opacity: 0; }
nav.open .hamburger span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile menu overlay */
.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: linear-gradient(170deg, var(--color-navy-900) 0%, var(--color-navy-800) 100%);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: var(--space-6) 0;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    z-index: 999;
}
.mobile-menu a {
    text-decoration: none;
    color: var(--color-navy-200);
    font-weight: 500;
    font-size: 15px;
    padding: var(--space-2) 0;
    transition: color 0.2s ease;
}
.mobile-menu a:hover { color: var(--color-white); }
.mobile-menu a.active { color: var(--color-white); }
.mobile-menu .mobile-menu-buttons {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid rgba(255,255,255,0.06);
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-buttons { display: none; }
    .hamburger { display: flex; }
    .nav-container { grid-template-columns: 1fr auto; }
    nav.open .mobile-menu { display: flex; }
}


/* ===== FOOTER (4-column layout) ===== */
footer {
    background-color: var(--color-navy-900);
    border-top: 1px solid var(--color-navy-700);
    padding: var(--space-12) 0 var(--space-8);
    color: var(--color-white);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

.footer-column h4 {
    font-family: 'DM Sans', sans-serif;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-navy-200);
    margin-bottom: var(--space-4);
}

.footer-column ul { list-style: none; }
.footer-column ul li { margin-bottom: var(--space-2); }

.footer-column a {
    display: block;
    color: var(--color-navy-300);
    text-decoration: none;
    font-size: var(--text-body-sm);
    font-weight: 500;
    transition: color 0.15s ease;
    padding: var(--space-1) 0;
    line-height: 1.4;
}

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

.footer-bottom {
    border-top: 1px solid var(--color-navy-700);
    padding-top: var(--space-4);
    text-align: center;
    color: var(--color-navy-400);
    font-size: var(--text-caption);
}

@media (max-width: 768px) {
    .footer-content { grid-template-columns: repeat(2, 1fr); }
}