/* ==========================================================================
   Omar Massfih — Design System
   --------------------------------------------------------------------------
   Layers:
     1. Primitive tokens   — raw palette + scales (the single source of truth)
     2. Semantic tokens    — intent-named tokens mapped from primitives
     3. Base / reset       — element defaults
     4. Layout             — page container + rhythm
     5. Components          — header, links, buttons, cards, code, icons
     6. Utilities          — small helpers
     7. Responsive          — breakpoint adjustments
   Only edit primitive/semantic tokens to re-skin; components consume tokens.
   ========================================================================== */

/* ==========================================================================
   1. PRIMITIVE TOKENS
   ========================================================================== */
:root {
  /* -- Neutral palette (One Dark inspired), dark → light -------------------- */
  --neutral-950: #1c1e24;
  --neutral-900: #21252b;
  --neutral-850: #282c34; /* base surface */
  --neutral-800: #2c313a;
  --neutral-700: #3a3f4b;
  --neutral-600: #4b5263;
  --neutral-500: #6b7280;
  --neutral-400: #969799;
  --neutral-300: #b0b4bd;
  --neutral-200: #d0d5df;
  --neutral-100: #e6e9ef;
  --neutral-000: #ffffff;

  /* -- Accent (amber/orange) ----------------------------------------------- */
  --accent-300: #ffc978;
  --accent-400: #ffb454;
  --accent-500: #ffa500; /* brand accent */
  --accent-600: #e8920a;

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

  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: clamp(1.25rem, 1.05rem + 0.9vw, 1.6rem);   /* h2 */
  --text-2xl: clamp(1.75rem, 1.3rem + 2vw, 2.5rem);     /* h1 */

  --leading-tight: 1.2;
  --leading-snug: 1.4;
  --leading-normal: 1.75;

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

  --tracking-normal: 0.01em;
  --tracking-wide: 0.02em;

  /* -- Spacing scale (4px base) -------------------------------------------- */
  --space-1: 0.25rem;  /* 4  */
  --space-2: 0.5rem;   /* 8  */
  --space-3: 0.75rem;  /* 12 */
  --space-4: 1rem;     /* 16 */
  --space-5: 1.5rem;   /* 24 */
  --space-6: 2rem;     /* 32 */
  --space-7: 3rem;     /* 48 */
  --space-8: 4rem;     /* 64 */

  /* -- Radii ---------------------------------------------------------------- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 999px;

  /* -- Borders -------------------------------------------------------------- */
  --border-width: 1px;

  /* -- Elevation ------------------------------------------------------------ */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.35);

  /* -- Motion --------------------------------------------------------------- */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 120ms;
  --duration: 180ms;
  --transition: var(--duration) var(--ease);

  /* -- Layout --------------------------------------------------------------- */
  --container: 44rem;       /* reading width */
  --container-wide: 58rem;  /* card grids */
  --gutter: clamp(1rem, 5vw, 2rem);

  --focus-ring: 2px;
}

/* ==========================================================================
   2. SEMANTIC TOKENS
   ========================================================================== */
:root {
  --color-bg: var(--neutral-850);
  --color-surface: var(--neutral-900);
  --color-surface-hover: var(--neutral-950);
  --color-header: var(--neutral-950);

  --color-border: rgba(194, 196, 200, 0.16);
  --color-border-strong: rgba(194, 196, 200, 0.28);

  --color-text: var(--neutral-200);
  --color-text-muted: var(--neutral-400);
  --color-heading: var(--neutral-000);

  --color-accent: var(--accent-500);
  --color-accent-hover: var(--accent-400);
  --color-on-accent: var(--neutral-950);

  --color-focus: var(--accent-400);
  --color-selection-bg: var(--accent-500);
  --color-selection-text: var(--neutral-950);
}

/* ==========================================================================
   3. BASE / RESET
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

::selection {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

img,
svg {
  max-width: 100%;
}

/* ---- Typography --------------------------------------------------------- */
h1,
h2,
h3 {
  color: var(--color-heading);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-wide);
  text-wrap: balance;
}

h1 {
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-2);
}

h2 {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
}

p {
  margin-bottom: var(--space-5);
  text-wrap: pretty;
}

ul,
ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-5);
}

li {
  margin-bottom: var(--space-1);
}

/* ==========================================================================
   4. LAYOUT
   ========================================================================== */
.flex-container {
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
  align-items: center;
}

/* Full-bleed bars (header) span the viewport; their inner content and <main>
   are centred to a shared reading measure via the container. */
body > * {
  padding-inline: var(--gutter);
}

header > nav {
  max-width: var(--container);
  margin-inline: auto;
}

main {
  width: min(calc(100% - var(--gutter) - var(--gutter)), var(--container));
  margin-inline: auto;
  padding-inline: 0;
  padding-bottom: var(--space-8);
}

section,
article {
  margin-bottom: var(--space-7);
}

section:last-child,
article:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   5. COMPONENTS
   ========================================================================== */

/* ---- Header / primary nav ----------------------------------------------- */
/* <site-header> is a custom element (site-header.js) that renders the shared
   <header> in light DOM. The gutter from `body > *` would land on the wrapper
   and break the full-bleed header bar, so it moves to <header> itself. */
site-header {
  display: block;
  padding-inline: 0;
}

header {
  background-color: var(--color-header);
  padding-inline: var(--gutter);
  padding-block: var(--space-3);
  margin-bottom: var(--space-7);
  border-bottom: var(--border-width) solid var(--color-border);
}

.header-nav-left {
  color: var(--color-heading);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
}

.header-nav-right {
  display: flex;
  gap: var(--space-1);
}

header a {
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: color var(--transition), background-color var(--transition);
}

header a:hover {
  background-color: var(--color-bg);
  color: var(--color-heading);
}

header a[aria-current="page"] {
  color: var(--color-heading);
}

/* ---- Links -------------------------------------------------------------- */
a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background-color var(--transition);
}

a:hover {
  background-color: var(--color-accent);
  color: var(--color-on-accent);
  text-decoration-color: transparent;
}

/* Inline emphasised link that reads as body text (white, accent on hover) */
.linkbody {
  color: var(--color-heading);
  padding-inline: 1px;
}

.linkbody:hover {
  background-color: transparent;
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

/* ---- Social icon buttons ------------------------------------------------ */
.social-links {
  justify-content: flex-start;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.image-link {
  display: inline-flex;
  padding: var(--space-1);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background-color var(--transition);
}

.image-link:hover {
  background-color: var(--color-surface);
}

.image-link .logo {
  display: block;
  width: 2.25rem;
  height: 2.25rem;
  fill: var(--color-text-muted);
  transition: fill var(--transition);
}

.image-link:hover .logo {
  fill: var(--color-heading);
}

/* ---- Home intro --------------------------------------------------------- */
.home-intro {
  padding-inline: var(--space-3);
}

/* ---- List rows (recent projects / notes) -------------------------------- */
.projects-head {
  margin-bottom: var(--space-2);
  padding-inline: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-width) solid var(--color-border);
}

.projects-head h2 {
  margin: 0;
}

.projects-link {
  margin-inline-end: 0;
}

.project {
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: background-color var(--transition), color var(--transition);
}

.project p {
  margin: 0;
}

.project:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-heading);
}

.source {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

/* ---- Cards (projects page) ---------------------------------------------- */
.project-main {
  width: min(calc(100% - var(--gutter) - var(--gutter)), var(--container-wide));
}

.project-main > section > p {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.project-main section > .flex-container {
  justify-content: center;
  align-items: stretch;
  gap: var(--space-5);
}

.project-box {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-4);
  flex: 1 1 22rem;
  max-width: 26rem;
  min-height: 15rem;
  padding: var(--space-5);
  background-color: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), transform var(--transition),
    box-shadow var(--transition);
}

.project-box:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-box h2 {
  margin: 0;
}

.project-box p {
  margin: 0;
  color: var(--color-text);
}

.project-box nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.project-box a {
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-heading);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition), border-color var(--transition),
    background-color var(--transition);
}

.project-box a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: var(--color-bg);
}

.project-section {
  margin-bottom: 0;
}

/* ---- Code --------------------------------------------------------------- */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.35em;
  background-color: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
}

pre {
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  background-color: var(--color-header);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  line-height: var(--leading-snug);
}

pre code {
  padding: 0;
  background: none;
  border: 0;
  font-size: var(--text-sm);
}

/* highlight.js theme overrides — kept aligned to the token palette */
.hljs {
  background-color: var(--color-header) !important;
  border-radius: var(--radius-md) !important;
  color: var(--color-heading) !important;
}

.hljs-keyword,
.hljs-type,
.hljs-title,
.hljs-built_in {
  color: #569cd6 !important;
}

.hljs-number,
.hljs-operator,
.hljs-variable,
.hljs-string {
  color: var(--color-heading) !important;
}

.hljs-comment {
  color: #57ad57 !important;
}

/* ---- Notes -------------------------------------------------------------- */
.notes-head {
  margin-top: var(--space-5);
}

.note section h2 {
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

/* ---- CV ----------------------------------------------------------------- */
.cv-section {
  margin-bottom: 0;
}

.cv-group {
  margin-bottom: var(--space-7);
}

.cv-group h2 {
  padding-inline: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-width) solid var(--color-border);
}

.cv-item {
  margin-bottom: 0;
  padding: var(--space-4) var(--space-3);
  border-bottom: var(--border-width) solid var(--color-border);
}

.cv-item h3 {
  margin-bottom: var(--space-1);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

.cv-kicker,
.cv-meta {
  margin-bottom: var(--space-1);
  color: var(--color-text-muted);
}

.cv-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.cv-meta {
  font-size: var(--text-sm);
}

.cv-list {
  margin-bottom: 0;
}

.cv-list li {
  margin-bottom: var(--space-2);
}

.cv-list li:last-child {
  margin-bottom: 0;
}

/* ---- Contact ------------------------------------------------------------ */
.contact > h2 {
  padding-bottom: var(--space-2);
  border-bottom: var(--border-width) solid var(--color-border);
  margin-bottom: var(--space-4);
}

/* ==========================================================================
   6. UTILITIES
   ========================================================================== */
.center {
  text-align: center;
}

/* ==========================================================================
   7. RESPONSIVE
   ========================================================================== */
@media (max-width: 600px) {
  header nav.flex-container {
    flex-direction: column;
    gap: var(--space-2);
    align-items: flex-start;
  }

  .header-nav-right {
    flex-wrap: wrap;
  }
}

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

  .project-box:hover {
    transform: none;
  }
}