/* ==========================================================================
   Premier Windows — Glazing
   Shared stylesheet for every page on glazing.premierwindows.com.au

   Structure (edit in place, keep the ordering):
   1. Design tokens (CSS custom properties)
   2. Modern reset
   3. Base elements & typography
   4. Accessibility helpers
   5. Layout (container, section, grid)
   6. Components (header, nav, footer, buttons)
   7. Utilities

   Written mobile-first. Larger screens are layered on with min-width media
   queries. No build step — this file is served as-is.
   ========================================================================== */

/* 1. Design tokens
   ------------------------------------------------------------------------- */
:root {
  /* Brand colour palette — adjust to match Premier Windows branding */
  --color-primary: #0a2540;
  --color-primary-dark: #061a2e;
  --color-accent: #1e88e5;
  --color-accent-dark: #1565c0;

  --color-text: #1a1a1a;
  --color-text-muted: #55606b;
  --color-heading: #0a2540;

  --color-bg: #ffffff;
  --color-bg-alt: #f4f7fa;
  --color-border: #dce3ea;

  --color-focus: #1e88e5;

  /* Typography — system font stack keeps things instant with zero web-font
     cost. Drop in a self-hosted font from /assets/fonts/ when required and
     update --font-sans. */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif, "Apple Color Emoji", "Segoe UI Emoji";

  --font-size-base: 1rem;      /* 16px */
  --line-height-base: 1.6;

  /* Fluid type scale (min → max) via clamp() */
  --font-size-lead: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --font-size-h1: clamp(2rem, 1.4rem + 3vw, 3.25rem);
  --font-size-h2: clamp(1.5rem, 1.2rem + 1.5vw, 2.25rem);
  --font-size-h3: clamp(1.25rem, 1.1rem + 0.8vw, 1.6rem);

  /* Spacing scale */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;

  /* Layout */
  --container-max: 72rem;      /* ~1152px */
  --container-pad: 1.25rem;

  /* Effects */
  --radius: 0.5rem;
  --shadow-sm: 0 1px 2px rgba(10, 37, 64, 0.08);
  --shadow-md: 0 6px 20px rgba(10, 37, 64, 0.12);

  --transition: 200ms ease;

  --header-height: 4rem;
}

/* 2. Modern reset
   ------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

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

body {
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button {
  cursor: pointer;
}

ul[class],
ol[class] {
  list-style: none;
  padding: 0;
}

a {
  color: var(--color-accent-dark);
  text-decoration-thickness: from-font;
  text-underline-offset: 0.15em;
}

/* 3. Base elements & typography
   ------------------------------------------------------------------------- */
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

h1,
h2,
h3,
h4 {
  color: var(--color-heading);
  line-height: 1.2;
  font-weight: 700;
  text-wrap: balance;
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }

p {
  text-wrap: pretty;
}

.lead {
  font-size: var(--font-size-lead);
  color: var(--color-text-muted);
  max-width: 60ch;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--color-bg-alt);
  padding: 0.1em 0.35em;
  border-radius: 0.25rem;
}

/* 4. Accessibility helpers
   ------------------------------------------------------------------------- */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: var(--space-md);
  top: -100%;
  z-index: 999;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius);
  text-decoration: none;
  transition: top var(--transition);
}

.skip-link:focus {
  top: var(--space-md);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* 5. Layout
   ------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: var(--space-2xl);
}

.section--alt {
  background: var(--color-bg-alt);
}

/* Simple responsive auto-grid; add .grid to a wrapper */
.grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
}

/* 6. Components
   ------------------------------------------------------------------------- */

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

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--space-md);
}

.site-header__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  text-decoration: none;
  color: var(--color-heading);
  font-weight: 700;
}

.site-header__brand-name {
  font-size: 1.125rem;
}

.site-header__brand-sub {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Nav toggle (hamburger) — visible on mobile only */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.6rem;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-heading);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Primary nav — collapsed under the header on mobile */
.primary-nav {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  display: none;
}

.primary-nav.is-open {
  display: block;
}

.primary-nav__list {
  display: flex;
  flex-direction: column;
  padding: var(--space-xs) var(--container-pad) var(--space-md);
}

.primary-nav__list a {
  display: block;
  padding: var(--space-sm) 0;
  color: var(--color-heading);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid var(--color-border);
}

.primary-nav__list a[aria-current="page"] {
  color: var(--color-accent-dark);
}

/* Desktop nav */
@media (min-width: 48rem) {
  .nav-toggle {
    display: none;
  }
  .primary-nav {
    position: static;
    display: block;
    background: transparent;
    border: 0;
    box-shadow: none;
  }
  .primary-nav__list {
    flex-direction: row;
    gap: var(--space-lg);
    padding: 0;
  }
  .primary-nav__list a {
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
  }
  .primary-nav__list a:hover,
  .primary-nav__list a[aria-current="page"] {
    border-bottom-color: var(--color-accent);
  }
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.75rem 1.5rem;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  transition: background-color var(--transition), border-color var(--transition),
    color var(--transition), transform var(--transition);
}

.button:active {
  transform: translateY(1px);
}

.button--primary {
  background: var(--color-accent);
  color: #fff;
}
.button--primary:hover {
  background: var(--color-accent-dark);
}

.button--secondary {
  background: transparent;
  color: var(--color-accent-dark);
  border-color: var(--color-accent);
}
.button--secondary:hover {
  background: var(--color-accent);
  color: #fff;
}

/* Footer */
.site-footer {
  flex-shrink: 0;
  background: var(--color-primary);
  color: #cdd8e4;
  padding-block: var(--space-xl);
}

.site-footer a {
  color: #fff;
}

.site-footer__copy {
  font-size: 0.9rem;
}

/* 7. Utilities
   ------------------------------------------------------------------------- */
.text-center { text-align: center; }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-lg { margin-bottom: var(--space-lg); }
.flow > * + * { margin-top: var(--space-md); }