/* ================================================
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   ================================================ */

:root,
[data-theme="light"] {
  /* Backgrounds — soft pastel cream */
  --color-bg-primary:    #f5f0eb;
  --color-bg-secondary:  #ede7df;
  --color-bg-tertiary:   #e4ddd3;

  /* Text — soft brown (pastel, less harsh) */
  --color-text-primary:   #5a3e3f;
  --color-text-secondary: #7d6465;
  --color-text-tertiary:  #a08e8f;

  /* Accent */
  --color-accent:        #5a3e3f;
  --color-accent-hover:  #472e2f;
  --color-accent-subtle: rgba(90, 62, 63, 0.06);

  /* Borders & Surfaces */
  --color-border:        rgba(90, 62, 63, 0.10);
  --color-border-hover:  rgba(90, 62, 63, 0.20);
  --color-surface:       #faf7f2;
  --color-surface-hover: #f5f0eb;

  /* UI */
  --color-nav-bg:        rgba(245, 240, 235, 0.85);
  --color-shadow:        rgba(90, 62, 63, 0.05);

}

[data-theme="dark"] {
  /* Backgrounds — reference: #121212 */
  --color-bg-primary:    #121212;
  --color-bg-secondary:  #1a1a18;
  --color-bg-tertiary:   #222220;

  /* Text */
  --color-text-primary:   #fdfaf3;
  --color-text-secondary: #b8b0a6;
  --color-text-tertiary:  #7a7470;

  /* Accent */
  --color-accent:        #fdfaf3;
  --color-accent-hover:  #e8e2d5;
  --color-accent-subtle: rgba(253, 250, 243, 0.06);

  /* Borders & Surfaces */
  --color-border:        rgba(253, 250, 243, 0.08);
  --color-border-hover:  rgba(253, 250, 243, 0.18);
  --color-surface:       #1a1a17;
  --color-surface-hover: #222220;

  /* UI */
  --color-nav-bg:        rgba(18, 18, 18, 0.85);
  --color-shadow:        rgba(0, 0, 0, 0.3);

}

:root {
  /* Aurora spectrum — sky/teal blues that invert to warm terracotta/brown in light mode */
  --aurora-1: #0284c7;
  --aurora-2: #38bdf8;
  --aurora-3: #7dd3fc;
  --aurora-4: #bae6fd;
  --aurora-5: #0ea5e9;

  /* Typography Scale */
  --font-display: 'Clash Display', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --font-hero:    clamp(5rem, 11vw, 14rem);
  --font-title:   clamp(4rem, 9vw, 12rem);
  --font-h1:      clamp(2.5rem, 5vw, 5rem);
  --font-h2:      clamp(1.5rem, 2.5vw, 2.5rem);
  --font-h3:      clamp(1.125rem, 1.5vw, 1.5rem);
  --font-body:    clamp(0.875rem, 1vw, 1rem);
  --font-small:   clamp(0.7rem, 0.8vw, 0.8125rem);
  --font-nav:     clamp(0.7rem, 0.75vw, 0.8125rem);

  /* Spacing (8px grid) */
  --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;
  --section-padding: clamp(3rem, 7vh, 6rem);

  /* Easing & Transitions */
  --ease-out-expo:   cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart:  cubic-bezier(0.25, 1, 0.5, 1);
  --transition-fast:  150ms var(--ease-out-expo);
  --transition-base:  300ms var(--ease-out-expo);
  --transition-slow:  600ms var(--ease-out-expo);
  --transition-theme: 500ms var(--ease-out-quart);

  /* Z-index Scale */
  --z-base:    1;
  --z-nav:     100;
  --z-toggle:  110;
  --z-overlay: 9999;
}

/* ================================================
   2. CSS RESET & BASE
   ================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 2rem;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: var(--font-body);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition:
    background-color var(--transition-theme),
    color var(--transition-theme);
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  background: none;
  border: none;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

/* Theme transitions on all themed elements */
a, button, span, p, h1, h2, h3, h4, li, div, section, nav, footer, header, article {
  transition:
    background-color var(--transition-theme),
    color var(--transition-theme),
    border-color var(--transition-theme),
    box-shadow var(--transition-theme);
}

/* ================================================
   AURORA BACKGROUND
   ================================================ */

@keyframes aurora {
  from {
    background-position: 50% 50%, 50% 50%;
  }
  to {
    background-position: 350% 50%, 350% 50%;
  }
}

.aurora {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.aurora__layer {
  position: absolute;
  inset: -10px;
  opacity: 0.45;
  will-change: transform;
  filter: blur(10px);

  background-image:
    repeating-linear-gradient(100deg, var(--color-bg-primary) 0%, var(--color-bg-primary) 7%, transparent 10%, transparent 12%, var(--color-bg-primary) 16%),
    repeating-linear-gradient(100deg, var(--aurora-1) 10%, var(--aurora-2) 15%, var(--aurora-3) 20%, var(--aurora-4) 25%, var(--aurora-5) 30%);
  background-size: 300%, 200%;
  background-position: 50% 50%, 50% 50%;

  mask-image: radial-gradient(ellipse at 100% 0%, black 10%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 100% 0%, black 10%, transparent 70%);
}

[data-theme="light"] .aurora__layer {
  filter: blur(10px) invert(1);
}

.aurora__layer::after {
  content: '';
  position: absolute;
  inset: 0;

  background-image:
    repeating-linear-gradient(100deg, var(--color-bg-primary) 0%, var(--color-bg-primary) 7%, transparent 10%, transparent 12%, var(--color-bg-primary) 16%),
    repeating-linear-gradient(100deg, var(--aurora-1) 10%, var(--aurora-2) 15%, var(--aurora-3) 20%, var(--aurora-4) 25%, var(--aurora-5) 30%);
  background-size: 200%, 100%;

  animation: aurora 60s linear infinite;
  background-attachment: fixed;
  mix-blend-mode: difference;
}

/* Lift page content above the aurora */
main,
.footer {
  position: relative;
  z-index: 1;
}

/* ================================================
   3. TYPOGRAPHY
   ================================================ */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
}

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

p {
  color: var(--color-text-secondary);
  max-width: 60ch;
}

/* ================================================
   4. LAYOUT UTILITIES
   ================================================ */

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

.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--section-padding) var(--space-3xl);
  position: relative;
}

.section__container {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.section__header {
  margin-bottom: var(--space-3xl);
}

.section__label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--font-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-md);
}

.section__title {
  font-size: var(--font-h1);
  text-transform: uppercase;
}

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

/* --- Skill Tags --- */
.skill-tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  cursor: default;
}

.skill-tag:hover {
  border-color: var(--color-text-primary);
  color: var(--color-text-primary);
  background: var(--color-accent-subtle);
}

/* ================================================
   6. NAVIGATION — Always-visible text labels
   ================================================ */

.nav {
  position: fixed;
  right: var(--space-3xl);
  top: var(--space-3xl);
  z-index: var(--z-nav);
}

.nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: flex-end;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--font-nav);
  font-weight: 400;
  text-transform: capitalize;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-text-primary);
}

.nav__link--active {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* --- Hamburger Button (hidden on desktop) --- */
.nav__hamburger {
  display: none;
}

.nav__hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all 0.3s var(--ease-out-expo);
}

/* ================================================
   7. THEME TOGGLE — Text-based
   ================================================ */

.theme-toggle {
  position: fixed;
  right: var(--space-3xl);
  top: 50%;
  z-index: var(--z-toggle);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.theme-toggle__option {
  font-family: var(--font-mono);
  font-size: var(--font-nav);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
  cursor: pointer;
}

.theme-toggle__option:hover {
  color: var(--color-text-secondary);
}

.theme-toggle__option--active {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* ================================================
   8. SECTION: HERO — Split diagonal layout
   ================================================ */

.section--hero {
  padding: var(--space-3xl);
  padding-right: calc(var(--space-5xl) + 6rem);
  align-items: stretch;
}

.hero {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: calc(100vh - var(--space-3xl) * 2);
}

.hero__top {
  padding-top: var(--space-xl);
}

.hero__name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--font-hero);
  text-transform: uppercase;
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: var(--color-text-primary);
}

.hero__name-line {
  display: block;
}

.hero__bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-2xl);
  padding-bottom: var(--space-xl);
}

.hero__bottom-left {
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.hero__description {
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 0.85vw, 0.875rem);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--color-text-primary);
}

.hero__decoration {
  color: var(--color-text-tertiary);
  opacity: 0.5;
  transition: transform 0.3s ease;
}

.hero__bottom-right {
  text-align: right;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--font-title);
  font-weight: 500;
  text-transform: uppercase;
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: var(--color-text-primary);
  text-align: right;
}

/* ================================================
   9. SECTION: SKILLS
   ================================================ */

/* ================================================
   10. SECTION: PROJECTS
   ================================================ */

.section--projects {
  min-height: auto;
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}

.projects-list {
  display: flex;
  flex-direction: column;
}

.project-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-xl);
  align-items: start;
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.project-card:first-child {
  border-top: 1px solid var(--color-border);
}

.project-card:hover {
  transform: translateX(8px);
}

.project-card:hover .project-card__index {
  color: var(--color-text-primary);
}

.project-card__index {
  font-family: var(--font-display);
  font-size: var(--font-h2);
  font-weight: 500;
  color: var(--color-text-tertiary);
  line-height: 1;
  transition: color var(--transition-fast);
  min-width: 3ch;
}

.project-card__content {
  flex: 1;
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--font-h2);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-md);
}

.project-card__description {
  font-size: var(--font-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  max-width: 55ch;
}

.project-card__outcome {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-accent, var(--color-text-primary));
  font-weight: 500;
  margin-bottom: var(--space-lg);
}

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

.project-card__tag {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-tertiary);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-accent-subtle);
  border-radius: 4px;
}

.project-card__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-top: var(--space-xs);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: var(--font-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  transition: all var(--transition-fast);
}

.project-card__link:hover {
  color: var(--color-text-primary);
  transform: translateX(4px);
}

.project-card__link svg {
  transition: transform var(--transition-fast);
}

.project-card__link:hover svg {
  transform: translate(2px, -2px);
}

.project-card__link--disabled {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}

/* ================================================
   SECTION: TESTIMONIALS
   ================================================ */

.section--testimonials {
  min-height: auto;
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.testimonial-card {
  padding: var(--space-2xl);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  transition: all var(--transition-fast);
}

.testimonial-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 12px 40px var(--color-shadow);
  transform: translateY(-2px);
}

.testimonial-card__stars {
  font-size: var(--font-body);
  color: #d4a050;
  letter-spacing: 0.1em;
}

.testimonial-card__text {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  font-style: italic;
  color: var(--color-text-secondary);
  line-height: 1.7;
  flex: 1;
}

.testimonial-card__footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.testimonial-card__project {
  font-family: var(--font-display);
  font-size: var(--font-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
}

.testimonial-card__source {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-tertiary);
  letter-spacing: 0.05em;
}

/* ================================================
   NAV CTA LINK
   ================================================ */

.nav__link--cta {
  color: var(--color-bg-primary) !important;
  background: var(--color-text-primary);
  padding: var(--space-xs) var(--space-md) !important;
  border-radius: 100px;
  font-weight: 500 !important;
  letter-spacing: 0.05em;
  transition: all var(--transition-fast);
}

.nav__link--cta:hover {
  opacity: 0.85;
}

/* ================================================
   HERO CTA LINK
   ================================================ */

.hero__cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 0.9vw, 0.875rem);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-bg-primary);
  background-color: var(--color-text-primary);
  padding: 0.9em 2em;
  border: 2px solid var(--color-text-primary);
  text-decoration: none;
  transition: all var(--transition-base);
}

.hero__cta:hover {
  color: var(--color-text-primary);
  background-color: transparent;
  border-color: var(--color-text-primary);
}

/* ================================================
   SECTION: ABOUT
   ================================================ */

.section--about {
  min-height: auto;
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}

.about__layout {
  display: flex;
  align-items: center;
  gap: var(--space-4xl);
  max-width: 1100px;
  margin: 0 auto;
}

.about__photo {
  flex-shrink: 0;
}

.about__headshot {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  object-fit: cover;
  object-position: center top;
}

.about__text {
  flex: 1;
}

.about__text .section__title {
  margin-top: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.about__bio {
  font-size: var(--font-body);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 55ch;
}

.about__bio + .about__bio {
  margin-top: var(--space-lg);
}

/* ================================================
   SECTION: SERVICES — 4-column grid
   ================================================ */

.section--services {
  min-height: auto;
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.service-card--tools {
  grid-column: 1 / -1;
}

.service-card {
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  transition: all var(--transition-fast);
}

.service-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 12px 40px var(--color-shadow);
  transform: translateY(-2px);
}

.service-card__title {
  font-family: var(--font-display);
  font-size: var(--font-h3);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.service-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.service-card__list li {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-secondary);
  padding-left: var(--space-md);
  position: relative;
}

.service-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-text-tertiary);
}

.service-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

/* ================================================
   SECTION: DEMO — Interactive AI Agent Demo
   ================================================ */

.section--demo {
  min-height: auto;
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}

/* Step indicators */
.demo__steps {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.demo__step {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  transition: color var(--transition-base);
}

.demo__step--active {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* Two-column grid with animated proportion shift */
.demo__grid {
  display: grid;
  gap: var(--space-xl);
  transition: grid-template-columns 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

.demo__grid[data-active-step="1"] {
  grid-template-columns: 2fr 1fr;
}

.demo__grid[data-active-step="2"] {
  grid-template-columns: 1fr 2fr;
}

/* Panels */
.demo__panel {
  padding: var(--space-2xl);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
  transition: all var(--transition-base);
  overflow: hidden;
}

.demo__panel:hover {
  border-color: var(--color-border-hover);
}

.demo__panel-title {
  font-family: var(--font-display);
  font-size: var(--font-h3);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.demo__panel-desc {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
  max-width: none;
}

/* Scenario pills */
.demo__scenarios {
  border: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.demo__pill {
  display: block;
  cursor: pointer;
}

.demo__pill-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.demo__pill-label {
  display: block;
  padding: var(--space-md) var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  transition: all var(--transition-fast);
}

.demo__pill-label:hover {
  border-color: var(--color-border-hover);
  background: var(--color-accent-subtle);
}

.demo__pill-input:checked + .demo__pill-label {
  border-color: var(--color-text-primary);
  background: var(--color-accent-subtle);
}

.demo__pill-input:focus-visible + .demo__pill-label {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}

.demo__pill-name {
  display: block;
  font-family: var(--font-display);
  font-size: var(--font-body-size);
  font-weight: 500;
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
}

.demo__pill-desc {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-tertiary);
  margin-top: var(--space-xs);
}

/* Buttons */
.demo__btn {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 0.9em 2em;
  border: 2px solid var(--color-text-primary);
  border-radius: 0;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.demo__btn--next,
.demo__btn--submit {
  color: var(--color-bg);
  background: var(--color-text-primary);
  margin-top: var(--space-xl);
}

.demo__btn--next:hover,
.demo__btn--submit:hover:not(:disabled) {
  color: var(--color-text-primary);
  background: transparent;
}

.demo__btn--back {
  color: var(--color-text-secondary);
  background: transparent;
  border-color: var(--color-border);
}

.demo__btn--back:hover {
  border-color: var(--color-text-primary);
  color: var(--color-text-primary);
}

.demo__btn--submit:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.demo__btn--retry {
  color: var(--color-text-primary);
  background: transparent;
  margin-top: var(--space-md);
}

.demo__btn--retry:hover {
  background: var(--color-accent-subtle);
}

/* Form */
.demo__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.demo__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.demo__label {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
}

.demo__input {
  font-family: var(--font-mono);
  font-size: var(--font-body-size);
  color: var(--color-text-primary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-md) var(--space-lg);
  transition: all var(--transition-fast);
  outline: none;
}

.demo__input::placeholder {
  color: var(--color-text-tertiary);
}

.demo__input:hover {
  border-color: var(--color-border-hover);
}

.demo__input:focus {
  border-color: var(--color-text-primary);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.demo__input--invalid {
  border-color: #c0392b;
}

.demo__error {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: #c0392b;
  min-height: 1.2em;
}

.demo__form-actions {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  margin-top: var(--space-sm);
}

.demo__selected-scenario {
  font-weight: 500;
  color: var(--color-text-primary);
}

/* Result states */
.demo__result {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
}

.demo__result-icon {
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.demo__result-title {
  font-family: var(--font-display);
  font-size: var(--font-h3);
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.demo__result-text {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: none;
}

.demo__result-text a {
  color: var(--color-text-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Loading spinner */
.demo__btn--submit.is-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.demo__btn--submit.is-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 18px;
  margin: -9px 0 0 -9px;
  border: 2px solid var(--color-bg);
  border-top-color: transparent;
  border-radius: 50%;
  animation: demoSpin 0.6s linear infinite;
}

@keyframes demoSpin {
  to { transform: rotate(360deg); }
}

/* ================================================
   SECTION: PROCESS — 3 numbered cards
   ================================================ */

.section--process {
  min-height: auto;
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}

.section__subtitle {
  font-family: var(--font-mono);
  font-size: var(--font-body);
  color: var(--color-text-secondary);
  max-width: 60ch;
  margin-top: var(--space-lg);
  line-height: 1.6;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.process-card {
  padding: var(--space-2xl);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
  transition: all var(--transition-fast);
}

.process-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 12px 40px var(--color-shadow);
  transform: translateY(-2px);
}

.process-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-xl);
}

.process-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent-subtle);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
}

.process-card__number {
  font-family: var(--font-display);
  font-size: var(--font-h2);
  font-weight: 600;
  color: var(--color-text-tertiary);
  line-height: 1;
  opacity: 0.4;
}

.process-card__title {
  font-family: var(--font-display);
  font-size: var(--font-h3);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.process-card__tagline {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  font-weight: 500;
  color: var(--color-text-primary);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xl);
  opacity: 0.7;
}

.process-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.process-card__list li {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-secondary);
  line-height: 1.5;
  padding-left: var(--space-md);
  position: relative;
}

.process-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-text-tertiary);
}

.process-card p + p {
  margin-top: var(--space-md);
}

/* ================================================
   CONTACT CTA BUTTON
   ================================================ */

.contact__cta-btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 0.9vw, 0.875rem);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-bg-primary);
  background: var(--color-text-primary);
  padding: 0.9em 2.5em;
  border: 2px solid var(--color-text-primary);
  transition: all var(--transition-fast);
}

.contact__cta-btn:hover {
  color: var(--color-text-primary);
  background: transparent;
  border-color: var(--color-text-primary);
}

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

.section--contact {
  min-height: auto;
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
  text-align: center;
}

.section--contact .section__header {
  text-align: center;
}

.contact__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xl);
}

.contact__text {
  font-size: var(--font-body);
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 50ch;
}

.contact__email {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 3rem);
  font-weight: 500;
  color: var(--color-text-primary);
  position: relative;
  display: inline-block;
}

.contact__email::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.contact__email:hover::after {
  transform: scaleX(1);
}

.contact__socials {
  display: flex;
  gap: var(--space-xl);
}

.contact__social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--font-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  transition: all var(--transition-fast);
}

.contact__social-link:hover {
  color: var(--color-text-primary);
  transform: translateY(-2px);
}

.contact__social-link svg {
  transition: transform var(--transition-fast);
}

.contact__social-link:hover svg {
  transform: scale(1.1);
}

.contact__social-link--disabled {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}

/* ================================================
   13. FOOTER
   ================================================ */

.footer {
  padding: var(--space-xl) var(--space-2xl);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer__text {
  font-family: var(--font-mono);
  font-size: var(--font-small);
  color: var(--color-text-tertiary);
  letter-spacing: 0.05em;
}

/* ================================================
   14. ANIMATIONS
   ================================================ */

@keyframes revealUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Hero elements: auto-animate on page load (CSS-only) */
.section--hero .reveal-up {
  opacity: 0;
  animation: revealUp 1s var(--ease-out-expo) forwards;
  animation-delay: calc(var(--delay, 0) * 0.2s);
}

/* Below-fold elements: wait for JS Intersection Observer */
.section:not(.section--hero) .reveal-up {
  opacity: 0;
  transform: translateY(30px);
}

.section:not(.section--hero) .reveal-up.revealed {
  animation: revealUp 0.8s var(--ease-out-expo) forwards;
  animation-delay: calc(var(--delay, 0) * 0.12s);
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 4px;
  border-radius: 2px;
}

/* ================================================
   15. REDUCED MOTION
   ================================================ */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal-up {
    opacity: 1 !important;
    transform: none !important;
  }

  .section--hero .reveal-up {
    opacity: 1 !important;
    animation: none !important;
  }

  .aurora__layer::after {
    animation: none !important;
  }
}

/* ================================================
   16. RESPONSIVE
   ================================================ */

/* Tablet */
@media (max-width: 900px) {
  .section {
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
  }

  .section--hero {
    padding-right: var(--space-xl);
  }

  .hero__name {
    font-size: clamp(3.5rem, 10vw, 8rem);
  }

  .hero__title {
    font-size: clamp(3rem, 8vw, 7rem);
  }

  .hero__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2xl);
  }

  .hero__bottom-right {
    text-align: left;
    align-self: flex-end;
  }

  /* Hide fixed nav/toggle on tablet, show in-flow */
  .nav {
    position: fixed;
    right: var(--space-xl);
    top: var(--space-xl);
  }

  .theme-toggle {
    right: var(--space-xl);
  }

  /* About: tighten gap on tablet */
  .about__layout {
    gap: var(--space-2xl);
  }

  .about__headshot {
    width: 150px;
    height: 150px;
  }

  /* Services: stack on tablet */
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Demo: stack grid on tablet */
  .demo__grid,
  .demo__grid[data-active-step="1"],
  .demo__grid[data-active-step="2"] {
    grid-template-columns: 1fr;
  }

  .demo__panel--form {
    max-height: 0;
    opacity: 0;
    padding-top: 0;
    padding-bottom: 0;
    border: none;
    transition: max-height 500ms cubic-bezier(0.16, 1, 0.3, 1),
                opacity 400ms cubic-bezier(0.16, 1, 0.3, 1),
                padding 400ms cubic-bezier(0.16, 1, 0.3, 1),
                border 400ms cubic-bezier(0.16, 1, 0.3, 1);
  }

  .demo__grid[data-active-step="2"] .demo__panel--form {
    max-height: 600px;
    opacity: 1;
    padding: var(--space-2xl);
    border: 1px solid var(--color-border);
  }

  .demo__grid[data-active-step="2"] .demo__panel--scenarios {
    opacity: 0.5;
  }

  /* Testimonials: stack to 1-col on tablet */
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* Process: stack to 1-col on tablet (3-col too cramped) */
  .process-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .project-card {
    grid-template-columns: auto 1fr;
    gap: var(--space-lg);
  }

  .project-card__links {
    grid-column: 2;
    flex-direction: row;
    padding-top: 0;
  }

  /* Nav CTA on tablet */
  .nav__link--cta {
    padding: var(--space-xs) var(--space-sm) !important;
    font-size: var(--font-nav);
  }

}

/* Mobile */
@media (max-width: 640px) {
  .section {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
    min-height: auto;
    padding-top: var(--section-padding);
    padding-bottom: var(--section-padding);
  }

  .section--hero {
    min-height: 100vh;
    min-height: 100dvh;
    padding: var(--space-lg);
  }

  .hero__name {
    font-size: clamp(2.5rem, 13vw, 5rem);
  }

  .hero__title {
    font-size: clamp(2rem, 11vw, 4rem);
  }

  .hero__bottom-left {
    max-width: 260px;
    gap: var(--space-md);
  }

  .hero__description {
    font-size: 0.7rem;
  }

  .hero__cta {
    font-size: 0.7rem;
    padding: 0.8em 1.6em;
  }

  /* ---- Hamburger Nav Overlay ---- */
  .nav {
    position: fixed;
    right: auto;
    left: 0;
    top: 0;
    width: 100%;
    height: auto;
    padding: 0;
    z-index: var(--z-nav);
  }

  .nav__hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    position: fixed;
    top: var(--space-lg);
    left: var(--space-lg);
    z-index: calc(var(--z-overlay) + 1);
    padding: 10px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }

  /* Hamburger → X animation */
  .nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Overlay */
  .nav__list {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    background: var(--color-bg-primary);
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--ease-out-expo), visibility 0.3s;
  }

  .nav--open .nav__list {
    opacity: 1;
    visibility: visible;
  }

  .nav__link {
    font-size: clamp(1rem, 4vw, 1.25rem);
    text-align: center;
    padding: var(--space-sm) var(--space-xl);
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  /* CTA in overlay */
  .nav__link--cta {
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-xl) !important;
    font-size: clamp(0.875rem, 3.5vw, 1rem) !important;
    min-height: 48px;
  }

  /* Theme toggle repositioned for mobile */
  .theme-toggle {
    position: fixed;
    right: var(--space-lg);
    top: var(--space-lg);
    z-index: calc(var(--z-overlay) + 1);
  }

  .theme-toggle__option {
    font-size: 0.625rem;
  }

  /* ---- About: stack vertically ---- */
  .about__layout {
    flex-direction: column;
    text-align: center;
    gap: var(--space-2xl);
  }

  .about__headshot {
    width: 140px;
    height: 140px;
  }

  .about__text .section__title {
    text-align: center;
  }

  .about__text .section__label {
    text-align: center;
  }

  .about__bio {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
  }

  /* ---- Services: single column on mobile ---- */
  .services-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .service-card {
    padding: var(--space-lg);
  }

  .service-card__title {
    font-size: 0.9rem;
  }

  /* ---- Demo: mobile adjustments ---- */
  .demo__panel {
    padding: var(--space-xl);
  }

  .demo__pill-label {
    border-radius: 12px;
    padding: var(--space-md);
  }

  .demo__form-actions {
    flex-direction: column;
  }

  .demo__form-actions .demo__btn {
    width: 100%;
    text-align: center;
  }

  .demo__btn {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  /* ---- Process: single column ---- */
  .process-grid {
    grid-template-columns: 1fr;
  }

  .process-card {
    padding: var(--space-xl);
  }

  .section__subtitle {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
  }

  /* ---- Projects: stack vertically ---- */
  .project-card {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .project-card__index {
    font-size: var(--font-h3);
  }

  .project-card__links {
    grid-column: 1;
    flex-direction: row;
  }

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

  /* ---- Contact ---- */
  .contact__email {
    font-size: clamp(1.2rem, 5vw, 2rem);
  }

  .contact__cta-btn {
    padding: var(--space-md) var(--space-xl);
    font-size: 0.8rem;
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .contact__socials {
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
  }

  .contact__social-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

/* Very small phones */
@media (max-width: 400px) {
  .services-grid {
    grid-template-columns: 1fr;
  }

  .hero__bottom {
    gap: var(--space-xl);
  }
}