/* ==============================================
   BYDIPS Foundation — styles.css
   -----------------------------------------------
   Table of Contents:
   1.  CSS Reset & Box Model
   2.  CSS Custom Properties (Design Tokens)
   3.  Base Typography
   4.  Spacing Utilities
   5.  Layout — Container
   6.  Components — Buttons
   7.  Components — Header & Navigation
   8.  Components — Hero
   9.  Components — Card Grid
   10. Components — Contact Form
   11. Components — Footer
   12. Responsive Breakpoints
   =============================================== */


/* -----------------------------------------------
   1. CSS Reset & Box Model
   ----------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}


/* -----------------------------------------------
   2. CSS Custom Properties (Design Tokens)
   Edit these per client to customise the palette,
   type scale, spacing, and radii.
   ----------------------------------------------- */
:root {
  /* --- Colors --- */
  --color-primary:        #0057FF;   /* Main brand colour */
  --color-primary-dark:   #0041CC;   /* Hover / active state */
  --color-secondary:      #F5A623;   /* Accent colour */
  --color-bg:             #FFFFFF;   /* Page background */
  --color-surface:        #F8F9FA;   /* Card / section background */
  --color-border:         #E2E8F0;   /* Subtle borders */
  --color-text:           #1A202C;   /* Body text */
  --color-text-muted:     #718096;   /* Secondary / caption text */
  --color-white:          #FFFFFF;
  --color-black:          #000000;

  /* --- Typography --- */
  --font-sans:   system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono:   "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --text-xs:   0.75rem;   /*  12px */
  --text-sm:   0.875rem;  /*  14px */
  --text-base: 1rem;      /*  16px */
  --text-lg:   1.125rem;  /*  18px */
  --text-xl:   1.25rem;   /*  20px */
  --text-2xl:  1.5rem;    /*  24px */
  --text-3xl:  1.875rem;  /*  30px */
  --text-4xl:  2.25rem;   /*  36px */
  --text-5xl:  3rem;      /*  48px */

  --font-weight-normal:   400;
  --font-weight-medium:   500;
  --font-weight-semibold: 600;
  --font-weight-bold:     700;

  --line-height-tight:  1.25;
  --line-height-snug:   1.375;
  --line-height-normal: 1.6;
  --line-height-relaxed:1.75;

  /* --- Spacing Scale (4 px 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 */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */

  /* --- Border Radius --- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* --- Shadows --- */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.07), 0 4px 6px rgba(0,0,0,0.05);

  /* --- Layout --- */
  --container-max: 1140px;
  --container-padding: var(--space-4);

  /* --- Transitions --- */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* --- Header height (used for scroll offset) --- */
  --header-height: 64px;
}


/* -----------------------------------------------
   3. Base Typography
   ----------------------------------------------- */
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-weight-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: var(--line-height-normal);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }
h6 { font-size: var(--text-sm); }

p {
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
}

small {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

strong { font-weight: var(--font-weight-semibold); }


/* -----------------------------------------------
   4. Spacing Utilities
   ----------------------------------------------- */
.mt-auto  { margin-top: auto; }
.mb-auto  { margin-bottom: auto; }
.mx-auto  { margin-left: auto; margin-right: auto; }
.text-center { text-align: center; }
.text-muted  { color: var(--color-text-muted); }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}


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


/* -----------------------------------------------
   6. Components — Buttons
   ----------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast),
              box-shadow var(--transition-fast);
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

.btn-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: rgba(255,255,255,0.15);
}


/* -----------------------------------------------
   7. Components — Header & Navigation
   ----------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
}

.logo-text {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

/* Primary Navigation */
.primary-nav .nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-1) 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Hamburger button (mobile) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-base);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
}

.hamburger::before { top: -6px; }
.hamburger::after  { top:  6px; }

/* Open state — animates to × */
.nav-toggle[aria-expanded="true"] .hamburger {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg) translate(4px, 4px);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg) translate(4px, -4px);
}


/* -----------------------------------------------
   8. Components — Hero
   ----------------------------------------------- */
.hero {
  /* Background: override --hero-bg per client via inline style or child stylesheet */
  background-color: var(--color-primary);
  background-image: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--space-24) 0;
  text-align: center;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.hero-title {
  font-size: var(--text-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  line-height: var(--line-height-tight);
  max-width: 720px;
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: rgba(255,255,255,0.85);
  max-width: 560px;
  line-height: var(--line-height-relaxed);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-4);
}


/* -----------------------------------------------
   9. Components — Card Grid (Services / Features)
   ----------------------------------------------- */
.section-services {
  padding: var(--space-20) 0;
  background-color: var(--color-surface);
}

.section-title {
  font-size: var(--text-3xl);
  text-align: center;
  margin-bottom: var(--space-3);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: var(--space-12);
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}

.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
}

.card-body {
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
}


/* -----------------------------------------------
   10. Components — Contact Form
   ----------------------------------------------- */
.section-contact {
  padding: var(--space-20) 0;
}

.contact-inner {
  max-width: 640px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin-top: var(--space-8);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,87,255,0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}


/* -----------------------------------------------
   11. Components — Footer
   ----------------------------------------------- */
.site-footer {
  background-color: var(--color-text);
  color: var(--color-white);
  padding-top: var(--space-12);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-8);
  padding-bottom: var(--space-10);
}

.footer-brand .logo-text {
  color: var(--color-white);
  font-size: var(--text-xl);
}

.footer-tagline {
  color: rgba(255,255,255,0.65);
  margin-top: var(--space-2);
  font-size: var(--text-sm);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  color: rgba(255,255,255,0.75);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-social {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: rgba(255,255,255,0.1);
  color: var(--color-white);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  text-decoration: none;
  transition: background-color var(--transition-fast);
}

.social-link:hover {
  background-color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: var(--space-4) 0;
}

.copyright {
  text-align: center;
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
}


/* -----------------------------------------------
   12. Responsive Breakpoints
   Mobile-first: styles above are the default (mobile).
   Wider viewports progressively enhance.
   ----------------------------------------------- */

/* --- Tablet: 640px and up --- */
@media (min-width: 640px) {
  :root {
    --container-padding: var(--space-6);
  }

  h1 { font-size: var(--text-5xl); }

  .hero-title {
    font-size: clamp(var(--text-4xl), 5vw, var(--text-5xl));
  }
}

/* --- Desktop: 1024px and up --- */
@media (min-width: 1024px) {
  :root {
    --container-padding: var(--space-8);
  }

  .nav-toggle {
    display: none; /* always hide on desktop */
  }

  .primary-nav {
    display: block !important; /* override JS collapse on desktop */
  }
}

/* --- Mobile only: below 1024px --- */
@media (max-width: 1023px) {
  /* Hamburger visible */
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Collapsed navigation */
  .primary-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    max-height: 0;
    transition: max-height var(--transition-base);
  }

  .primary-nav.is-open {
    max-height: 400px;
  }

  .primary-nav .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-4) var(--container-padding);
  }

  .primary-nav .nav-list li {
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--text-base);
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  /* Hero adjustments */
  .hero {
    padding: var(--space-16) 0;
  }

  .hero-title {
    font-size: var(--text-3xl);
  }

  .hero-subtitle {
    font-size: var(--text-base);
  }

  /* Footer stacks on mobile */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-social {
    justify-content: flex-start;
  }
}

/* --- Large desktop: 1280px and up --- */
@media (min-width: 1280px) {
  :root {
    --container-max: 1280px;
  }
}