/* ============================================
   contAIn™ — Global Styles
   Mobile-first, modern CSS, accessible
   ============================================ */

/* --- Cascade Layers --- */
@layer reset, base, layout, components, utilities;

/* --- CSS Custom Properties --- */
@layer base {
  :root {
    /* Colour palette — blue/purple infrastructure feel */
    --color-bg: #ffffff;
    --color-bg-alt: #f7f7fb;
    --color-bg-dark: #0f1029;
    --color-bg-dark-alt: #161838;
    --color-text: #1a1a2e;
    --color-text-light: #5a5a7a;
    --color-text-on-dark: #e8e8f0;
    --color-text-muted: #9494b0;
    --color-accent: #4f46e5;
    --color-accent-hover: #4338ca;
    --color-accent-light: #e0e7ff;
    --color-secondary: #7c3aed;
    --color-secondary-light: #ede9fe;
    --color-tertiary: #c084fc;
    --color-border: #e2e2f0;
    --color-border-dark: #2a2a4a;
    --color-pink: #c4b5fd;

    /* Typography */
    --font-display: 'Inter', system-ui, -apple-system, sans-serif;
    --font-body: 'Source Serif 4', 'Georgia', serif;

    /* Fluid type scale */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
    --text-sm: clamp(0.8125rem, 0.775rem + 0.25vw, 0.875rem);
    --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
    --text-lg: clamp(1.125rem, 1.05rem + 0.4vw, 1.25rem);
    --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    --text-2xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
    --text-3xl: clamp(1.875rem, 1.4rem + 2.4vw, 2.75rem);
    --text-4xl: clamp(2.25rem, 1.6rem + 3.2vw, 3.5rem);

    /* Spacing scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;

    /* Layout */
    --max-width: 72rem;
    --max-width-narrow: 48rem;
    --max-width-prose: 40rem;
    --nav-height: 4rem;
    --border-radius: 0.375rem;
    --border-radius-lg: 0.75rem;

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

/* --- Reset --- */
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: calc(var(--nav-height) + 1rem);
  }

  body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.65;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100dvh;
  }

  img {
    max-width: 100%;
    height: auto;
    display: block;
  }
}

/* --- Base typography & links --- */
@layer base {
  a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);

    &:hover {
      color: var(--color-accent-hover);
    }

    &:focus-visible {
      outline: 2px solid var(--color-accent);
      outline-offset: 2px;
      border-radius: 2px;
    }
  }

  h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
    letter-spacing: -0.01em;
    text-wrap: balance;
  }

  h1 { font-size: var(--text-4xl); font-weight: 700; }
  h2 { font-size: var(--text-3xl); }
  h3 { font-size: var(--text-2xl); }
  h4 { font-size: var(--text-xl); }

  p {
    max-width: 65ch;
    margin-block-end: var(--space-md);

    &:last-child {
      margin-block-end: 0;
    }
  }

  strong { font-weight: 600; }

  blockquote {
    font-style: italic;
    border-inline-start: 3px solid var(--color-accent);
    padding-inline-start: var(--space-lg);
    margin-block: var(--space-xl);
    color: var(--color-text-light);
  }
}

/* --- Layout --- */
@layer layout {
  .container {
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--space-lg);
  }

  .container--narrow { max-width: var(--max-width-narrow); }
  .container--prose { max-width: var(--max-width-prose); }

  .section {
    padding-block: var(--space-4xl);
  }

  .section--dark {
    background-color: var(--color-bg-dark);
    color: var(--color-text-on-dark);

    & h1, & h2, & h3, & h4 {
      color: var(--color-text-on-dark);
    }
  }

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

/* --- Components --- */
@layer components {

  /* --- Navigation --- */
  .nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgb(255 255 255 / 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-block-end: 1px solid var(--color-border);
    height: var(--nav-height);
  }

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

  .nav__brand {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;

    &:hover { color: var(--color-text); }

    & span { color: var(--color-accent); }
  }

  .nav__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);

    & svg { width: 24px; height: 24px; }
  }

  .nav__links {
    display: none;
    list-style: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-block-end: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    box-shadow: 0 4px 12px rgb(0 0 0 / 0.05);

    &.is-open {
      display: flex;
      flex-direction: column;
      gap: var(--space-sm);
    }

    & a {
      display: block;
      padding: var(--space-sm) 0;
      font-family: var(--font-display);
      font-size: var(--text-sm);
      font-weight: 500;
      color: var(--color-text-light);
      transition: color var(--transition-fast);
      min-height: 44px;
      display: flex;
      align-items: center;

      &:hover,
      &[aria-current="page"] {
        color: var(--color-accent);
      }
    }
  }

  @media (min-width: 768px) {
    .nav__toggle { display: none; }

    .nav__links {
      display: flex;
      position: static;
      flex-direction: row;
      align-items: center;
      gap: var(--space-xl);
      background: none;
      border: none;
      padding: 0;
      box-shadow: none;

      & a {
        min-height: auto;
      }
    }
  }

  /* --- Buttons --- */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1;
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    min-height: 48px;
    white-space: nowrap;

    &:focus-visible {
      outline: 2px solid var(--color-accent);
      outline-offset: 2px;
    }
  }

  .btn--primary {
    background-color: var(--color-accent);
    color: #ffffff;

    &:hover {
      background-color: var(--color-accent-hover);
      color: #ffffff;
      transform: translateY(-1px);
      box-shadow: 0 4px 16px rgb(79 70 229 / 0.35);
    }

    &:active {
      transform: translateY(0);
      box-shadow: 0 2px 8px rgb(79 70 229 / 0.25);
    }
  }

  .btn--secondary {
    background-color: transparent;
    color: var(--color-accent);
    border: 1.5px solid var(--color-accent);

    &:hover {
      background-color: var(--color-accent-light);
      color: var(--color-accent-hover);
    }
  }

  .btn--ghost {
    background: transparent;
    color: var(--color-accent);
    padding: 0.5rem 0;
    border-bottom: 1px solid transparent;

    &:hover {
      border-bottom-color: var(--color-accent);
    }
  }

  .btn--on-dark {
    background-color: #ffffff;
    color: var(--color-bg-dark);

    &:hover {
      background-color: var(--color-accent-light);
      color: var(--color-accent);
    }
  }

  .cta-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: stretch;

    @media (min-width: 480px) {
      flex-direction: row;
      align-items: center;
      align-items: flex-start;
    }
  }

  .cta-group--center {
    justify-content: center;
    align-items: center;
  }

  /* --- Hero --- */
  .hero {
    padding-block: var(--space-4xl) var(--space-3xl);
    text-align: center;

    @media (min-width: 768px) {
      padding-block: var(--space-5xl) var(--space-4xl);
    }

    & h1 {
      margin-block-end: var(--space-lg);
      max-width: 18ch;
      margin-inline: auto;
    }
  }

  .hero__subline {
    font-size: var(--text-lg);
    color: var(--color-text-light);
    max-width: 50ch;
    margin-inline: auto;
    margin-block-end: var(--space-2xl);
  }

  /* Triptych strip */
  .triptych {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    justify-content: center;
    align-items: center;
    margin-block-end: var(--space-2xl);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 500;
    text-transform: lowercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);

    & span {
      padding: var(--space-sm) var(--space-lg);
      border: 1px solid var(--color-border);
      border-radius: var(--border-radius);
      background: var(--color-bg-alt);
      transition: border-color var(--transition-base), color var(--transition-base);

      &:hover {
        border-color: var(--color-accent);
        color: var(--color-accent);
      }
    }

    @media (min-width: 640px) {
      flex-direction: row;
      gap: var(--space-md);
    }
  }

  /* --- Panels --- */
  .panel {
    padding: var(--space-2xl) var(--space-xl);
    border-radius: var(--border-radius-lg);
  }

  .panel--bordered {
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.04);
  }

  .panel--dark {
    background-color: var(--color-bg-dark);
    color: var(--color-text-on-dark);
  }

  /* --- Quote block --- */
  .quote-block {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
  }

  .quote-block__text {
    font-family: var(--font-body);
    font-size: var(--text-lg);
    font-style: italic;
    color: var(--color-text-on-dark);
    max-width: 55ch;
    margin-inline: auto;
    margin-block-end: var(--space-lg);
    line-height: 1.7;
    border-left: none;
    padding-left: 0;
  }

  .quote-block__attribution {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-style: normal;

    & cite { font-style: italic; }
  }

  /* --- Forms --- */
  .form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);

    & label {
      font-family: var(--font-display);
      font-size: var(--text-sm);
      font-weight: 500;
      color: var(--color-text);
    }

    & input {
      font-family: var(--font-body);
      font-size: var(--text-base);
      padding: 0.75rem 1rem;
      border: 1.5px solid var(--color-border);
      border-radius: var(--border-radius);
      background-color: var(--color-bg);
      color: var(--color-text);
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
      min-height: 48px;
      width: 100%;

      &:focus {
        outline: none;
        border-color: var(--color-accent);
        box-shadow: 0 0 0 3px var(--color-accent-light);
      }

      &::placeholder {
        color: var(--color-text-muted);
      }
    }
  }

  .signup-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 28rem;

    & .btn { width: 100%; }
  }

  .form-note {
    font-family: var(--font-display);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-block-start: var(--space-xs);
  }

  /* --- Product Ladder / Road --- */
  .road {
    position: relative;
    padding-inline-start: var(--space-2xl);

    &::before {
      content: '';
      position: absolute;
      inset-inline-start: 0.75rem;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(
        to bottom,
        var(--color-accent),
        var(--color-secondary),
        var(--color-border)
      );
    }
  }

  .road__stop {
    position: relative;
    padding-block-end: var(--space-2xl);

    &:last-child { padding-block-end: 0; }

    &::before {
      content: '';
      position: absolute;
      inset-inline-start: calc(-1 * var(--space-2xl) + 0.5rem);
      top: 0.25rem;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background-color: var(--color-accent);
      border: 2px solid var(--color-bg);
      box-shadow: 0 0 0 2px var(--color-accent);
      transition: box-shadow var(--transition-base);
    }

    &--future::before {
      background-color: var(--color-border);
      box-shadow: 0 0 0 2px var(--color-border);
    }

    &--future .road__tagline,
    &--future .road__name {
      color: var(--color-text-muted);
    }
  }

  .road__name {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text);
    margin-block-end: var(--space-xs);
  }

  .road__tagline {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-accent);
    margin-block-end: var(--space-xs);
  }

  .road__meta {
    font-family: var(--font-display);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
  }

  /* --- Footer --- */
  .footer {
    border-block-start: 1px solid var(--color-border);
    padding-block: var(--space-2xl);
    font-family: var(--font-display);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
  }

  .footer__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    text-align: center;

    @media (min-width: 768px) {
      flex-direction: row;
      justify-content: space-between;
      text-align: left;
    }
  }

  .footer__links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    justify-content: center;
    list-style: none;

    & a {
      color: var(--color-text-muted);
      font-size: var(--text-xs);
      min-height: 44px;
      display: inline-flex;
      align-items: center;

      &:hover { color: var(--color-accent); }
    }
  }

  /* --- Photos --- */
  .photo {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    filter: grayscale(100%);

    & img {
      width: 100%;
      object-fit: cover;
      transition: filter var(--transition-base);
    }

    &:hover img {
      filter: grayscale(60%);
    }
  }

  /* --- Narrative scroll (About page) --- */
  .narrative-section {
    padding-block: var(--space-3xl);
    border-block-end: 1px solid var(--color-border);

    &:last-of-type { border-block-end: none; }

    & h2 { margin-block-end: var(--space-lg); }
    & p { margin-block-end: var(--space-md); }
  }

  .pull-quote {
    font-family: var(--font-body);
    font-size: var(--text-xl);
    font-style: italic;
    color: var(--color-secondary);
    border-inline-start: 3px solid var(--color-secondary);
    padding-inline-start: var(--space-lg);
    margin-block: var(--space-2xl);
    max-width: 50ch;
  }

  /* --- Stats strip --- */
  .stat-strip {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);

    @media (min-width: 640px) {
      grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
    }
  }

  .stat-strip__item {
    text-align: center;
    padding: var(--space-lg);
  }

  .stat-strip__number {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-accent);
  }

  .stat-strip__label {
    font-family: var(--font-display);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-block-start: var(--space-xs);
  }

  /* --- Trust line --- */
  .trust-line {
    font-family: var(--font-display);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-block-start: var(--space-sm);

    & svg {
      width: 14px;
      height: 14px;
      flex-shrink: 0;
    }
  }

  /* --- Exit popup --- */
  .popup-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background-color: rgb(15 16 41 / 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);

    &.is-visible {
      display: flex;
    }
  }

  .popup {
    background: var(--color-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--space-2xl);
    max-width: 28rem;
    width: 100%;
    position: relative;
    box-shadow: 0 24px 48px rgb(0 0 0 / 0.15);

    & h3 {
      margin-block-end: var(--space-md);
      font-size: var(--text-xl);
    }

    & p {
      margin-block-end: var(--space-lg);
      color: var(--color-text-light);
    }
  }

  .popup__close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    font-size: 1.25rem;

    &:hover { color: var(--color-text); }
  }

  /* --- Cookie consent --- */
  .cookie-banner {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 900;
    background-color: var(--color-bg-dark);
    color: var(--color-text-on-dark);
    padding: var(--space-lg);
    box-shadow: 0 -4px 24px rgb(0 0 0 / 0.1);

    &.is-visible { display: block; }
  }

  .cookie-banner__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    text-align: center;
    max-width: var(--max-width);
    margin-inline: auto;

    @media (min-width: 768px) {
      flex-direction: row;
      text-align: left;
    }
  }

  .cookie-banner__text {
    font-family: var(--font-display);
    font-size: var(--text-sm);

    & a { color: var(--color-tertiary); }
  }

  .cookie-banner__actions {
    display: flex;
    gap: var(--space-sm);
    flex-shrink: 0;
  }

  /* --- Scroll-driven fade-in for sections --- */
  @supports (animation-timeline: view()) {
    .section,
    .narrative-section {
      animation: fade-in-up linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 25%;
    }

    @keyframes fade-in-up {
      from {
        opacity: 0;
        transform: translateY(1.5rem);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
  }

  /* --- Appetiser grid --- */
  .appetiser-grid {
    @media (min-width: 768px) {
      grid-template-columns: 1fr 1fr !important;
    }
  }
}

/* --- Utilities --- */
@layer utilities {
  .text-center {
    text-align: center;

    & p { margin-inline: auto; }
  }

  .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;
  }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- Print --- */
@media print {
  .nav, .footer, .popup-overlay, .cookie-banner {
    display: none !important;
  }

  body {
    font-size: 12pt;
    color: #000;
  }
}