/* ============================================================
   josephalfonso.com — Design System
   ============================================================
   Organized as:
   1. Tokens (custom properties)
   2. Typography
   3. Layout & Grid
   4. Navigation
   5. Hero
   6. Project Cards
   7. Case Study Layout
   8. Buttons
   9. Tags / Skill Chips
   10. About Section
   11. Contact Section
   12. Footer
   13. Utilities
   14. Dark Mode
   ============================================================ */


/* ============================================================
   1. TOKENS
   ============================================================ */
:root {

  /* --- Color (dark by default) --- */
  --color-bg:               #181817;
  --color-surface:          #222221;
  --color-surface-elevated: #2A2A29;
  --color-border:           #343432;
  --color-border-strong:    #484846;

  --color-text:             #F0F0EE;
  --color-text-secondary:   #9A9A98;
  --color-text-muted:       #5C5C5A;
  --color-text-inverse:     #0F0F0E;

  --color-accent:           #4D94FF;
  --color-accent-hover:     #7AB3FF;
  --color-accent-subtle:    #0F1E38;

  --color-success:          #1A7F4B;
  --color-warning:          #B45309;

  /* --- Typography --- */
  --font-sans:   'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:   'JetBrains Mono', 'Fira Code', ui-monospace, monospace;

  --text-xs:     0.75rem;    /* 12px */
  --text-sm:     0.875rem;   /* 14px */
  --text-base:   1rem;       /* 16px */
  --text-md:     1.125rem;   /* 18px */
  --text-lg:     1.25rem;    /* 20px */
  --text-xl:     1.5rem;     /* 24px */
  --text-2xl:    2rem;       /* 32px */
  --text-3xl:    2.5rem;     /* 40px */
  --text-4xl:    3.25rem;    /* 52px */
  --text-5xl:    4rem;       /* 64px */

  --leading-tight:   1.2;
  --leading-snug:    1.35;
  --leading-normal:  1.6;
  --leading-relaxed: 1.75;

  --tracking-tight:  -0.03em;
  --tracking-normal: 0em;
  --tracking-wide:   0.06em;
  --tracking-wider:  0.1em;

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

  /* --- Spacing (4px 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 */
  --space-32:  8rem;      /* 128px */

  /* Legacy aliases (used in markup) */
  --spacing-xs: var(--space-2);
  --spacing-sm: var(--space-4);
  --spacing-md: var(--space-8);
  --spacing-lg: var(--space-16);
  --spacing-xl: var(--space-32);

  /* --- Layout --- */
  --max-width:       1200px;
  --max-width-text:  680px;
  --gutter:          var(--space-8);

  /* --- Radius --- */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   20px;
  --radius-full: 9999px;

  /* --- Shadows --- */
  --shadow-sm:  0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg:  0 12px 32px rgba(0, 0, 0, 0.10);
  --shadow-xl:  0 24px 64px rgba(0, 0, 0, 0.12);

  /* --- Motion --- */
  --ease-default:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:       cubic-bezier(0.4, 0, 1, 1);
  --ease-out:      cubic-bezier(0, 0, 0.2, 1);
  --duration-fast: 120ms;
  --duration-base: 200ms;
  --duration-slow: 350ms;

  /* --- Z-index --- */
  --z-base:    0;
  --z-raised:  10;
  --z-overlay: 100;
  --z-modal:   200;
  --z-nav:     300;
}


/* ============================================================
   2. TYPOGRAPHY
   ============================================================ */

/* Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-md); font-weight: var(--weight-medium); }

p {
  max-width: var(--max-width-text);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

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

strong { font-weight: var(--weight-semibold); color: var(--color-text); }
em     { font-style: italic; }

small, .text-sm { font-size: var(--text-sm); }

.label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.eyebrow {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-accent);
}

blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
  color: var(--color-text-secondary);
  font-size: var(--text-md);
  font-style: italic;
  line-height: var(--leading-relaxed);
}

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.4em;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-12) 0;
}


/* ============================================================
   3. LAYOUT & GRID
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

section {
  padding-block: var(--space-24);
}

section + section {
  padding-top: 0;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-8);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.grid--auto {
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

/* Flex helpers */
.flex        { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between{ display: flex; align-items: center; justify-content: space-between; }
.gap-sm      { gap: var(--space-4); }
.gap-md      { gap: var(--space-8); }


/* ============================================================
   4. NAVIGATION
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.nav__logo {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-default);
}

.nav__logo:hover { opacity: 0.7; color: var(--color-text); }

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

.nav__links a {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

.nav__links a:hover,
.nav__links a[aria-current="page"] {
  color: var(--color-text);
}


/* ============================================================
   5. HERO
   ============================================================ */

.hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-32) var(--space-24);
}

/* Orb layer sits behind hero content */
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* Fade bottom of hero into page background */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 220px;
  background: linear-gradient(to bottom, transparent, var(--color-bg));
  z-index: 1;
  pointer-events: none;
}

/* Content wrapper lifts above orbs and fade overlay */
.hero > .container {
  position: relative;
  z-index: 2;
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(72px);
  will-change: transform;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-fill-mode: both;
}

.hero__orb--1 {
  width: 700px;
  height: 700px;
  background: radial-gradient(circle at center, var(--orb-1, rgba(0, 82, 204, 0.15)) 0%, transparent 70%);
  top: -220px;
  right: -180px;
  animation: orb-float-1 20s ease-in-out infinite alternate;
}

.hero__orb--2 {
  width: 520px;
  height: 520px;
  background: radial-gradient(circle at center, var(--orb-2, rgba(99, 102, 241, 0.12)) 0%, transparent 70%);
  bottom: -160px;
  left: -120px;
  animation: orb-float-2 25s ease-in-out infinite alternate;
}

.hero__orb--3 {
  width: 380px;
  height: 380px;
  background: radial-gradient(circle at center, var(--orb-3, rgba(14, 165, 233, 0.09)) 0%, transparent 70%);
  top: 40%;
  left: 42%;
  transform: translate(-50%, -50%);
  animation: orb-float-3 16s ease-in-out infinite alternate;
}

@keyframes orb-float-1 {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(-70px, 90px) scale(1.12); }
}

@keyframes orb-float-2 {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(90px, -70px) scale(0.88); }
}

@keyframes orb-float-3 {
  from { transform: translate(-50%, -50%) scale(1); }
  to   { transform: translate(calc(-50% + 60px), calc(-50% - 50px)) scale(1.18); }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  .hero__orb { animation: none; }
}

.hero__eyebrow {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.hero__headline {
  font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text);
  max-width: 16ch;
  margin-bottom: var(--space-6);
}

.hero__subheadline {
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  max-width: 52ch;
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-10);
}

.hero__meta {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.hero__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.hero__meta-dot {
  color: var(--color-border-strong);
  font-size: var(--text-sm);
  user-select: none;
}

.hero__meta-link {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

.hero__meta-link:hover {
  color: var(--color-accent-hover);
}

/* Rotating text in hero headline */
.hero__rotate {
  display: inline-block;
  color: var(--color-accent);
  transition:
    opacity 900ms cubic-bezier(0.4, 0, 0.2, 1),
    transform 900ms cubic-bezier(0.4, 0, 0.2, 1);
}

.hero__rotate.is-fading {
  opacity: 0;
  transform: translateY(10px);
}


/* ============================================================
   6. PROJECT CARDS
   ============================================================ */

.projects {
  padding-block: var(--space-16);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-6);
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition:
    box-shadow var(--duration-base) var(--ease-default),
    transform var(--duration-base) var(--ease-default),
    border-color var(--duration-base) var(--ease-default);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  color: inherit;
}

.card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-surface);
  display: block;
}

.card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: var(--space-3);
}

.card__eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.card__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
  color: var(--color-text);
  margin: 0;
}

.card__metric {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
}

.card__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin: 0;
  max-width: none;
}

.card__footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.card__cta {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  white-space: nowrap;
}


/* ============================================================
   7. CASE STUDY LAYOUT
   ============================================================ */

.case-study-header {
  padding-block: var(--space-20) var(--space-16);
  border-bottom: 1px solid var(--color-border);
}

.case-study-header__eyebrow { margin-bottom: var(--space-4); }

.case-study-header__title {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  max-width: 20ch;
  margin-bottom: var(--space-6);
}

.case-study-header__summary {
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  max-width: 60ch;
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-10);
}

.case-study-meta {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-6);
  padding-block: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.case-study-meta__item {}

.case-study-meta__label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.case-study-meta__value {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text);
}

.case-study-body {
  padding-block: var(--space-16);
}

.case-study-body h2 {
  font-size: var(--text-2xl);
  margin-top: var(--space-16);
  margin-bottom: var(--space-6);
}

.case-study-body h3 {
  font-size: var(--text-xl);
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}

.case-study-body p {
  margin-bottom: var(--space-6);
}

.case-study-body img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  margin-block: var(--space-10);
}

.case-study-body figcaption {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: calc(var(--space-10) * -1 + var(--space-3));
  margin-bottom: var(--space-10);
}

/* Stat callout */
.stat-block {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  padding: var(--space-8);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  margin-block: var(--space-10);
}

.stat-block__item {}

.stat-block__number {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-block__label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* AI jump link */
.ai-jump-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  margin-bottom: var(--space-8);
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent-subtle);
  border: 1px solid var(--color-accent);
  border-radius: 999px;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.ai-jump-link:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

.ai-jump-link__badge {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: 0.06em;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: 999px;
  padding: 2px 7px;
  transition: background 0.15s ease, color 0.15s ease;
}

.ai-jump-link:hover .ai-jump-link__badge {
  background: var(--color-bg);
  color: var(--color-accent);
}

/* AI phase highlight */
.ai-highlight {
  background: var(--color-accent-subtle);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-block: var(--space-10);
}

.ai-highlight__label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.ai-highlight__heading {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.ai-surfaces {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.ai-surface-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border, rgba(0,0,0,0.08));
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-5);
}

.ai-surface-card__num {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-1);
}

.ai-surface-card__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.ai-surface-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.55;
}

@media (max-width: 600px) {
  .ai-surfaces { grid-template-columns: 1fr; }
}

/* Insight / callout block */
.callout {
  padding: var(--space-6) var(--space-8);
  background: var(--color-accent-subtle);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-block: var(--space-8);
}

.callout p {
  margin: 0;
  font-size: var(--text-md);
  color: var(--color-text);
}


/* Mobile screenshot grid (for resignation and similar mobile case studies) */
.figure-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
  align-items: flex-start;
  margin-block: var(--space-8);
}

.figure-grid img {
  flex: 1 1 0;
  min-width: 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  display: block;
  object-fit: contain;
}

.figure-grid--2 img {
  max-width: 280px;
}

.figure-grid--3 img {
  max-width: 220px;
}

.figure-grid figcaption {
  width: 100%;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-align: center;
  margin-top: var(--space-2);
}

/* Case study cover image */
.case-study-cover {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  margin-block: var(--space-10);
}

/* Case study list */
.case-study-list {
  list-style: none;
  padding: 0;
  margin: var(--space-6) 0 var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.case-study-list li {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  padding-left: var(--space-5);
  position: relative;
}

.case-study-list li::before {
  content: '-';
  position: absolute;
  left: 0;
  color: var(--color-text-muted);
}

/* Case study next/prev navigation */
.case-study-nav {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-24);
  padding-top: var(--space-10);
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   8. BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: 1;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background-color var(--duration-fast) var(--ease-default),
    color var(--duration-fast) var(--ease-default),
    border-color var(--duration-fast) var(--ease-default),
    box-shadow var(--duration-fast) var(--ease-default),
    transform var(--duration-fast) var(--ease-default);
}

.btn:active { transform: scale(0.98); }

/* Primary */
.btn--primary {
  background: var(--color-text);
  color: var(--color-text-inverse);
  border-color: var(--color-text);
}
.btn--primary:hover {
  background: #2A2A28;
  border-color: #2A2A28;
  color: var(--color-text-inverse);
}

/* Secondary */
.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn--secondary:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

/* Ghost */
.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
  padding-inline: var(--space-3);
}
.btn--ghost:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

/* Accent */
.btn--accent {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn--accent:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
}

/* Sizes */
.btn--sm { font-size: var(--text-xs); padding: var(--space-2) var(--space-4); }
.btn--lg { font-size: var(--text-base); padding: var(--space-4) var(--space-8); border-radius: var(--radius-lg); }


/* ============================================================
   9. TAGS / SKILL CHIPS
   ============================================================ */

.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  line-height: 1;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.tag--accent {
  background: var(--color-accent-subtle);
  border-color: transparent;
  color: var(--color-accent);
}

.tag--solid {
  background: var(--color-text);
  border-color: var(--color-text);
  color: var(--color-text-inverse);
}


/* ============================================================
   10. ABOUT SECTION
   ============================================================ */

.about {
  padding-block: var(--space-24);
}

.about__layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-16);
  align-items: start;
}

.about__image {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.about__content {}

.about__title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-6);
}

.about__body {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-8);
  max-width: none;
}

.about__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}


/* About detail sections (background, approach, currently) */
.about-detail {
  padding-block: var(--space-16);
}

.about-detail__heading {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-10);
}

/* Timeline */
.about-timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
}

.about-timeline__item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-8);
}

.about-timeline__meta {
  padding-top: 3px;
}

.about-timeline__role {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-1);
  max-width: none;
}

.about-timeline__company {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-3);
  max-width: none;
}

.about-timeline__detail {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  max-width: none;
}

/* Principles grid */
.about-principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.about-principles__item {
  padding: var(--space-6);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.about-principles__title {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.about-principles__body {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  max-width: none;
}

@media (max-width: 640px) {
  .about-timeline__item {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .about-principles {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   11. CONTACT SECTION
   ============================================================ */

.contact {
  padding-block: var(--space-24);
  text-align: center;
}

.contact__title {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
}

.contact__subtitle {
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  max-width: 48ch;
  margin-inline: auto;
  margin-bottom: var(--space-10);
}

.contact__links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}


/* ============================================================
   12. FOOTER
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-10);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-footer__copy {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
  max-width: none;
}

.site-footer__links {
  display: flex;
  gap: var(--space-6);
}

.site-footer__links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

.site-footer__links a:hover { color: var(--color-text); }


/* ============================================================
   13. UTILITIES
   ============================================================ */

/* Visually hidden (accessible) */
.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;
}

/* Divider */
.divider {
  width: 100%;
  height: 1px;
  background: var(--color-border);
  margin-block: var(--space-12);
}

/* Text helpers */
.text-muted     { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-accent    { color: var(--color-accent); }

/* Margin / padding resets */
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }


/* ============================================================
   14. RESPONSIVE
   ============================================================ */

@media (max-width: 900px) {
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }

  .about__layout {
    grid-template-columns: 1fr;
  }

  .about__image {
    aspect-ratio: 3 / 2;
    max-width: 360px;
  }

  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  :root { --gutter: var(--space-4); }

  .nav__links { gap: var(--space-5); }
  .hero { padding-block: var(--space-20) var(--space-16); }
  .projects__grid { grid-template-columns: 1fr; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .contact__links { flex-direction: column; align-items: center; }
  .site-footer__inner { flex-direction: column; align-items: flex-start; }

  .stat-block { grid-template-columns: repeat(2, 1fr); }
}


/* ============================================================
   15. COLOR SCHEME
   ============================================================ */

/* Dark is the default — these rules always apply */
.site-header {
  background: rgba(15, 15, 14, 0.88);
}

.btn--primary {
  background: var(--color-text);
  color: var(--color-text-inverse);
}

/* Light mode override for users with light system preference */
@media (prefers-color-scheme: light) {
  :root {
    --color-bg:               #FFFFFF;
    --color-surface:          #F6F6F4;
    --color-surface-elevated: #FFFFFF;
    --color-border:           #E4E4E2;
    --color-border-strong:    #C8C8C6;

    --color-text:             #111110;
    --color-text-secondary:   #5C5C5A;
    --color-text-muted:       #9A9A98;
    --color-text-inverse:     #FFFFFF;

    --color-accent:           #0052CC;
    --color-accent-hover:     #003D99;
    --color-accent-subtle:    #EBF2FF;

    --shadow-sm:  0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg:  0 12px 32px rgba(0, 0, 0, 0.10);
    --shadow-xl:  0 24px 64px rgba(0, 0, 0, 0.12);
  }

  .site-header {
    background: rgba(255, 255, 255, 0.88);
  }

  /* Orb colors/opacity are set dynamically per palette */
}