/* ==========================================================================
   santiagotm.com -- Complete Stylesheet
   Light mode default, dark mode via [data-theme="dark"]
   ========================================================================== */

/* ==========================================================================
   1. DESIGN TOKENS
   ========================================================================== */

:root {
  /* ----- Primitives ----- */
  --color-black:        #000000;
  --color-white:        #FFFFFF;

  /* Dark neutrals (used in dark mode, referenced from light mode for contrast) */
  --color-neutral-950:  #0A0A0A;
  --color-neutral-900:  #111111;
  --color-neutral-850:  #1A1A1A;
  --color-neutral-800:  #1E1E1E;
  --color-neutral-750:  #2C2C2C;
  --color-neutral-600:  #4A4A4A;
  --color-neutral-500:  #7D7D7D;
  --color-neutral-400:  #A9A9A9;
  --color-neutral-300:  #BDBDBD;
  --color-neutral-200:  #D3D3D3;
  --color-neutral-100:  #E5E5E5;
  --color-neutral-50:   #F2F2F2;
  --color-neutral-0:    #F8F8F8;

  /* ----- Semantic Tokens (Light Mode Default) ----- */

  /* Backgrounds */
  --bg-page:            var(--color-neutral-0);
  --bg-surface:         var(--color-white);
  --bg-surface-raised:  var(--color-neutral-50);
  --bg-glass:           rgba(255, 255, 255, 0.80);

  /* Text */
  --text-primary:       var(--color-black);
  --text-secondary:     var(--color-neutral-950);
  --text-body:          var(--color-neutral-600);
  --text-muted:         var(--color-neutral-500);
  --text-inverse:       var(--color-white);

  /* Borders & Dividers */
  --border-default:     var(--color-neutral-200);
  --border-strong:      var(--color-neutral-300);
  --border-subtle:      rgba(0, 0, 0, 0.06);

  /* Interactive */
  --bg-hover:           var(--color-neutral-50);
  --bg-active:          var(--color-neutral-100);
  --bg-selection:       rgba(0, 0, 0, 0.08);

  /* ----- Typography Scale ----- */

  /* Font families */
  --font-heading:  'Inter', 'Helvetica Neue', 'Arial', sans-serif;
  --font-body:     'DM Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --font-label:    'Space Mono', 'Courier New', monospace;

  /* Fluid type scale -- clamp(min, preferred, max) */
  --text-display:  clamp(3.5rem, 7vw + 0.5rem, 8rem);
  --text-h1:       clamp(2.5rem, 4vw + 0.5rem, 5rem);
  --text-h2:       clamp(2rem, 3vw + 0.5rem, 3.5rem);
  --text-h3:       clamp(1.5rem, 1.5vw + 0.5rem, 2.25rem);
  --text-body-lg:  clamp(1.125rem, 1.5vw + 0.25rem, 1.375rem);
  --text-body:     clamp(1rem, 0.5vw + 0.75rem, 1.125rem);
  --text-body-sm:  0.9375rem;
  --text-label:    0.75rem;
  --text-label-lg: 0.875rem;
  --text-caption:  0.75rem;
  --text-code:     0.8125rem;
  --text-code-lg:  0.9375rem;

  /* Font weights */
  --weight-regular:   400;
  --weight-medium:    500;
  --weight-semibold:  600;
  --weight-bold:      700;
  --weight-extrabold: 800;

  /* ----- Spacing Scale (8px base) ----- */
  --space-0:   0;
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-5:   1.5rem;
  --space-6:   2rem;
  --space-7:   2.5rem;
  --space-8:   3rem;
  --space-9:   4rem;
  --space-10:  5rem;
  --space-11:  6rem;
  --space-12:  8rem;
  --space-13:  10rem;
  --space-14:  12rem;

  /* Section padding (responsive via clamp) */
  --section-padding-y: clamp(4rem, 8vw, 8rem);
  --section-padding-x: clamp(1.5rem, 5vw, 6rem);

  /* Content max-width */
  --content-width:  75rem;
  --content-narrow: 48rem;

  /* ----- Borders, Shadows, Transitions, Z-Index ----- */

  /* Border radii */
  --radius-none:  0;
  --radius-sm:    0.25rem;
  --radius-md:    0.5rem;
  --radius-lg:    0.75rem;

  /* Shadows (light mode) */
  --shadow-sm:     0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md:     0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg:     0 8px 40px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
  --transition-theme:  400ms ease;
  --transition-reveal: 600ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Z-index scale */
  --z-base:    0;
  --z-above:   10;
  --z-sticky:  100;
  --z-overlay: 200;
  --z-modal:   300;
  --z-toast:   400;
}

/* ----- Dark Mode Override ----- */
[data-theme="dark"] {
  /* Backgrounds */
  --bg-page:            var(--color-neutral-900);
  --bg-surface:         var(--color-neutral-800);
  --bg-surface-raised:  var(--color-neutral-850);
  --bg-glass:           rgba(26, 26, 26, 0.75);

  /* Text */
  --text-primary:       var(--color-neutral-50);
  --text-secondary:     var(--color-neutral-200);
  --text-body:          var(--color-neutral-500);
  --text-muted:         var(--color-neutral-400);
  --text-inverse:       var(--color-black);

  /* Borders & Dividers */
  --border-default:     var(--color-neutral-750);
  --border-strong:      var(--color-neutral-600);
  --border-subtle:      rgba(255, 255, 255, 0.06);

  /* Interactive */
  --bg-hover:           var(--color-neutral-850);
  --bg-active:          var(--color-neutral-750);
  --bg-selection:       rgba(255, 255, 255, 0.12);

  /* Shadows (dark mode) */
  --shadow-sm:     0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:     0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg:     0 8px 32px rgba(0, 0, 0, 0.5);
}


/* ==========================================================================
   2. RESET / BASE
   ========================================================================== */

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

/* Theme transition on all elements */
*,
*::before,
*::after {
  transition: background-color var(--transition-theme),
              color var(--transition-theme),
              border-color var(--transition-theme),
              fill var(--transition-theme),
              stroke var(--transition-theme);
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--text-body);
  background-color: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-black);
  outline-offset: 2px;
}

[data-theme="dark"] :focus-visible {
  outline-color: var(--color-white);
}

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

/* 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;
  }
}


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

h1, h2, h3, h4, h5, h6, .heading {
  font-family: var(--font-heading);
  color: var(--text-primary);
}

h1 {
  font-size: var(--text-h1);
  font-weight: var(--weight-bold);
  line-height: 1.0;
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-h2);
  font-weight: var(--weight-semibold);
  line-height: 1.1;
  letter-spacing: -0.015em;
}

h3 {
  font-size: var(--text-h3);
  font-weight: var(--weight-semibold);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

code, .mono {
  font-family: var(--font-mono);
}

.label {
  font-family: var(--font-label);
}


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

/* Section containers */
.section {
  padding: var(--section-padding-y) var(--section-padding-x);
}

.section--dark {
  background: var(--bg-page);
}

.section--light {
  background: var(--color-neutral-100);
}

[data-theme="dark"] .section--light {
  background: var(--bg-surface-raised);
}

.section__inner {
  max-width: var(--content-width);
  margin: 0 auto;
}

.section__inner--narrow {
  max-width: var(--content-narrow);
}


/* ==========================================================================
   5. SECTION TAG LABELS
   ========================================================================== */

.section-tag {
  font-family: var(--font-label);
  font-size: var(--text-label);
  font-weight: var(--weight-regular);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0 0 var(--space-3);
}

.section-tag--lined {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.section-tag--lined::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--border-strong);
}

.section-heading {
  font-family: var(--font-heading);
  font-size: var(--text-h2);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0 0 var(--space-5);
  max-width: 24ch;
}


/* ==========================================================================
   6. GRADIENT TEXT
   ========================================================================== */

.gradient-text {
  background: linear-gradient(
    135deg,
    var(--color-black) 0%,
    var(--color-neutral-750) 50%,
    var(--color-neutral-500) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="dark"] .gradient-text {
  background: linear-gradient(
    135deg,
    var(--color-white) 0%,
    var(--color-neutral-300) 50%,
    var(--color-neutral-500) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}


/* ==========================================================================
   7. NAVIGATION
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--space-4) 0;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base),
              border-color var(--transition-base),
              padding var(--transition-base);
}

.nav--scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom-color: var(--border-subtle);
  padding: var(--space-3) 0;
}

.nav__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--section-padding-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3rem;
}

.nav__logo {
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-text {
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav__links {
  display: none;
  gap: var(--space-6);
}

.nav__link {
  font-family: var(--font-label);
  font-size: var(--text-label-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  text-decoration: none;
  position: relative;
  padding: var(--space-1) 0;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-primary);
  transition: width var(--transition-base);
}

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

.nav__link:hover::after,
.nav__link[aria-current="page"]::after {
  width: 100%;
}

/* Theme toggle */
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav__theme-toggle {
  background: none;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.nav__theme-toggle:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.nav__theme-icon {
  font-size: 1.25rem;
  transition: transform 0.4s ease, opacity 0.2s ease;
  position: absolute;
}

.nav__theme-icon--dark {
  opacity: 0;
  transform: rotate(-90deg);
}

.nav__theme-icon--light {
  opacity: 1;
  transform: rotate(0);
}

[data-theme="dark"] .nav__theme-icon--dark {
  opacity: 1;
  transform: rotate(0);
}

[data-theme="dark"] .nav__theme-icon--light {
  opacity: 0;
  transform: rotate(90deg);
}

/* Mobile menu button */
.nav__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  padding: var(--space-2);
  width: 44px;
  height: 44px;
}

/* Hamburger icon */
.nav__menu-icon {
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: background var(--transition-fast);
}

.nav__menu-icon::before,
.nav__menu-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition-base);
}

.nav__menu-icon::before { top: -7px; }
.nav__menu-icon::after  { top: 7px; }

.nav__menu-icon--open {
  background: transparent;
}

.nav__menu-icon--open::before {
  transform: translateY(7px) rotate(45deg);
}

.nav__menu-icon--open::after {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu overlay */
.nav__mobile {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-page);
  z-index: calc(var(--z-overlay) - 1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav__mobile-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.nav__mobile-link {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  color: var(--text-primary);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.nav__mobile-link:hover {
  opacity: 0.6;
}


/* ==========================================================================
   8. HERO SECTION
   ========================================================================== */

/* Variant A: Full-VH */
.hero--full {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: var(--section-padding-y) var(--section-padding-x);
  padding-top: calc(5rem + var(--section-padding-y));
}

/* Variant B: Subpage (50vh) */
.hero--subpage {
  min-height: 50vh;
  min-height: 50dvh;
  display: flex;
  align-items: center;
  padding: var(--section-padding-y) var(--section-padding-x);
  padding-top: calc(5rem + var(--section-padding-y));
}

.hero__content {
  max-width: var(--content-width);
  width: 100%;
}

.hero__tag {
  margin: 0 0 var(--space-4);
}

.hero__name {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-extrabold);
  line-height: 0.9;
  letter-spacing: -0.03em;
  margin: 0 0 var(--space-5);
}

.hero__page-title {
  font-family: var(--font-heading);
  font-size: var(--text-h1);
  font-weight: var(--weight-bold);
  line-height: 1.0;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-4);
}

.hero__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  color: var(--text-body);
  line-height: 1.5;
  max-width: 36rem;
  margin: 0 0 var(--space-8);
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Scroll indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
}

.hero__scroll-line {
  display: block;
  width: 1px;
  height: 48px;
  background: var(--border-strong);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50%      { opacity: 1; }
}


/* ==========================================================================
   9. CARD SYSTEM
   ========================================================================== */

/* Variant A: Surface Card */
.card--surface {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.card--surface:hover {
  border-color: var(--border-strong);
}

/* Variant B: Dark Card (Raised) */
.card--dark {
  background: var(--color-neutral-900);
  color: var(--color-neutral-100);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.card--dark:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

[data-theme="dark"] .card--dark {
  background: var(--color-neutral-950);
}

.card__title {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
}

.card--dark .card__title {
  color: var(--color-white);
}

.card__text {
  font-size: var(--text-body);
  color: var(--text-body);
  line-height: 1.6;
  margin: 0;
}

.card--dark .card__text {
  color: var(--color-neutral-300);
}

/* Variant C: Project Card (with Hover Reveal) */
.project-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  cursor: pointer;
}

.project-card__bg {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
}

.project-card__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--transition-reveal);
}

.project-card__bg-placeholder {
  font-size: 3rem;
  color: var(--text-muted);
  opacity: 0.3;
}

.project-card:hover .project-card__bg img {
  transform: scale(1.05);
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.85) 0%,
    rgba(0, 0, 0, 0.2) 50%,
    rgba(0, 0, 0, 0) 100%
  );
  transition: background 0.4s ease;
}

.project-card__overlay--active {
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.95) 0%,
    rgba(0, 0, 0, 0.5) 60%,
    rgba(0, 0, 0, 0.15) 100%
  );
}

.project-card__content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-6);
  transform: translateY(calc(100% - 4rem));
  transition: transform 0.4s var(--transition-reveal);
}

.project-card__content--active {
  transform: translateY(0);
}

.project-card__category {
  font-family: var(--font-label);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-neutral-300);
  margin: 0 0 var(--space-2);
}

.project-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: var(--weight-semibold);
  color: var(--color-white);
  margin: 0 0 var(--space-2);
}

.project-card__description {
  font-size: var(--text-body-sm);
  color: var(--color-neutral-300);
  line-height: 1.5;
  margin: 0 0 var(--space-4);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.project-card__links {
  display: flex;
  gap: var(--space-4);
}

.project-card__link {
  font-family: var(--font-label);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-white);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: opacity var(--transition-fast);
}

.project-card__link:hover {
  opacity: 0.7;
}


/* ==========================================================================
   10. BUTTON SYSTEM
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-label);
  font-size: var(--text-label-lg);
  font-weight: var(--weight-regular);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-height: 48px;
}

/* Primary */
.btn--primary {
  background: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.btn--primary:hover {
  background: var(--color-neutral-850);
  border-color: var(--color-neutral-850);
}

.btn--primary:active {
  background: var(--color-neutral-750);
  transform: scale(0.98);
}

[data-theme="dark"] .btn--primary {
  background: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-white);
}

[data-theme="dark"] .btn--primary:hover {
  background: var(--color-neutral-200);
  border-color: var(--color-neutral-200);
}

[data-theme="dark"] .btn--primary:active {
  background: var(--color-neutral-300);
}

/* Ghost */
.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn--ghost:hover {
  border-color: var(--text-secondary);
  background: var(--bg-hover);
}

.btn--ghost:active {
  background: var(--bg-active);
  transform: scale(0.98);
}

/* CTA (Larger) */
.btn--cta {
  padding: var(--space-5) var(--space-8);
  font-size: 1rem;
}

/* Arrow animation */
.btn__arrow {
  display: inline-block;
  transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}


/* ==========================================================================
   11. TAG COMPONENT
   ========================================================================== */

.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-label);
  font-size: 0.6875rem;
  font-weight: var(--weight-regular);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-body);
  background: var(--bg-hover);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  white-space: nowrap;
}


/* ==========================================================================
   12. TIMELINE COMPONENT
   ========================================================================== */

.timeline {
  position: relative;
  padding-left: var(--space-8);
}

/* Vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border-default);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-8);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__dot {
  position: absolute;
  left: calc(-1 * var(--space-8));
  top: 0.35em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-primary);
  transform: translateX(-4.5px);
  border: 2px solid var(--bg-page);
}

[data-theme="dark"] .timeline__dot {
  border-color: var(--bg-page);
}

.timeline__date {
  font-family: var(--font-label);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0 0 var(--space-2);
}

.timeline__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  margin: 0 0 var(--space-1);
}

.timeline__company {
  font-size: var(--text-body-sm);
  color: var(--text-body);
  margin: 0 0 var(--space-3);
}

.timeline__description {
  font-size: var(--text-body-sm);
  color: var(--text-body);
  line-height: 1.6;
  margin: 0 0 var(--space-3);
}

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


/* ==========================================================================
   13. PROJECT GRID + FILTER TABS
   ========================================================================== */

.filter-tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.filter-tab {
  font-family: var(--font-label);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-5);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
}

.filter-tab:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.filter-tab--active {
  color: var(--text-inverse);
  background: var(--text-primary);
  border-color: var(--text-primary);
}

[data-theme="dark"] .filter-tab--active {
  color: var(--color-black);
  background: var(--color-white);
  border-color: var(--color-white);
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.project-grid__item {
  /* Transitions handled by Alpine x-transition */
}


/* ==========================================================================
   14. CONTACT FORM
   ========================================================================== */

.contact-form {
  max-width: var(--content-narrow);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.contact-form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.contact-form__label {
  font-family: var(--font-label);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
}

.contact-form__input {
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  transition: border-color var(--transition-fast), background var(--transition-fast);
  resize: vertical;
  min-height: 44px;
}

.contact-form__input::placeholder {
  color: var(--text-muted);
}

.contact-form__input:focus {
  outline: none;
  border-color: var(--text-primary);
  background: var(--bg-surface-raised);
}

.contact-form__input--error {
  border-color: #cc3333;
}

[data-theme="dark"] .contact-form__input--error {
  border-color: #ff4444;
}

.contact-form__textarea {
  min-height: 120px;
}

.contact-form__error {
  font-family: var(--font-label);
  font-size: 0.6875rem;
  color: #cc3333;
  margin: 0;
}

[data-theme="dark"] .contact-form__error {
  color: #ff4444;
}

.contact-form__status {
  font-size: var(--text-body-sm);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid;
}

.contact-form__status--success {
  color: #16a34a;
  border-color: #16a34a;
  background: rgba(22, 163, 74, 0.1);
}

[data-theme="dark"] .contact-form__status--success {
  color: #4ade80;
  border-color: #4ade80;
  background: rgba(74, 222, 128, 0.1);
}

.contact-form__status--error {
  color: #cc3333;
  border-color: #cc3333;
  background: rgba(204, 51, 51, 0.1);
}

[data-theme="dark"] .contact-form__status--error {
  color: #ff4444;
  border-color: #ff4444;
  background: rgba(255, 68, 68, 0.1);
}

.contact-form__status--fallback {
  color: #2563eb;
  border-color: #2563eb;
  background: rgba(37, 99, 235, 0.1);
}

[data-theme="dark"] .contact-form__status--fallback {
  color: #60a5fa;
  border-color: #60a5fa;
  background: rgba(96, 165, 250, 0.1);
}


/* ==========================================================================
   15. CTA BANNER
   ========================================================================== */

.cta-banner {
  padding: var(--space-12) var(--section-padding-x);
  background: var(--bg-surface-raised);
  text-align: center;
}

.cta-banner__inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
}

.cta-banner__heading {
  font-family: var(--font-heading);
  font-size: var(--text-h2);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
}

.cta-banner__text {
  font-size: var(--text-body-lg);
  color: var(--text-body);
  margin: 0 0 var(--space-6);
}


/* ==========================================================================
   16. FOOTER
   ========================================================================== */

.footer {
  padding: var(--space-9) var(--section-padding-x) var(--space-6);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-page);
}

.footer__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer__logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  text-decoration: none;
}

.footer__tagline {
  font-size: var(--text-body-sm);
  color: var(--text-muted);
  margin: var(--space-1) 0 0;
}

.footer__nav {
  display: flex;
  gap: var(--space-5);
}

.footer__link {
  font-family: var(--font-label);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-body);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer__social {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

.footer__social-link {
  color: var(--text-body);
  font-size: 1.25rem;
  transition: color var(--transition-fast);
  padding: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.footer__bottom {
  max-width: var(--content-width);
  margin: var(--space-8) auto 0;
  padding-top: var(--space-5);
  border-top: 1px solid var(--border-subtle);
}

.footer__copyright {
  font-family: var(--font-label);
  font-size: 0.6875rem;
  color: var(--text-muted);
  margin: 0;
}


/* ==========================================================================
   17. 404 PAGE
   ========================================================================== */

.error-page {
  text-align: center;
}

.error-page .hero__content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.error-page .hero__subtitle {
  max-width: 32rem;
}

.error-page .hero__actions {
  justify-content: center;
}


/* ==========================================================================
   18. SOCIAL LINKS SECTION
   ========================================================================== */

.social-links {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
  justify-content: center;
  padding-top: var(--space-5);
}

.social-link-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-label);
  font-size: var(--text-label-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--space-4) var(--space-6);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.social-link-item:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background: var(--bg-hover);
}

.social-link-item i {
  font-size: 1.5rem;
}


/* ==========================================================================
   19. TECH STACK GRID
   ========================================================================== */

.tech-category {
  margin-bottom: var(--space-8);
}

.tech-category:last-child {
  margin-bottom: 0;
}

.tech-category__title {
  font-family: var(--font-label);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0 0 var(--space-4);
}

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


/* ==========================================================================
   20. BIO TEXT
   ========================================================================== */

.bio-text {
  font-size: var(--text-body-lg);
  color: var(--text-body);
  line-height: 1.7;
  max-width: var(--content-narrow);
}

.bio-text p {
  margin-bottom: var(--space-5);
}

.bio-text p:last-child {
  margin-bottom: 0;
}


/* ==========================================================================
   21. PROJECT PLACEHOLDER
   ========================================================================== */

.project-card__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
}

.project-card__placeholder-icon {
  font-size: 4rem;
  color: var(--text-muted);
  opacity: 0.3;
}


/* ==========================================================================
   22. 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-width: 0;
}

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

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

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--space-10) var(--space-4);
  color: var(--text-muted);
  font-family: var(--font-label);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}


/* ==========================================================================
   23. PRINT STYLES
   ========================================================================== */

@media print {
  .nav,
  .footer,
  .cta-banner,
  .hero__scroll-indicator {
    display: none !important;
  }

  body {
    background: white;
    color: black;
    font-family: Georgia, serif;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  a {
    text-decoration: underline;
    color: black;
  }
}


/* ==========================================================================
   24. RESPONSIVE -- MEDIA QUERIES
   Mobile-first: base styles are for < 768px
   ========================================================================== */

/* ---------- Tablet: 768px+ ---------- */
@media (min-width: 768px) {
  .nav__menu-btn {
    display: none;
  }

  .nav__links {
    display: flex;
  }

  /* Timeline alternating layout */
  .timeline {
    padding-left: 0;
  }

  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline__item {
    display: flex;
    align-items: flex-start;
    width: 100%;
  }

  .timeline__item:nth-child(odd) {
    flex-direction: row;
  }

  .timeline__item:nth-child(even) {
    flex-direction: row-reverse;
  }

  .timeline__content {
    width: calc(50% - var(--space-8));
  }

  .timeline__dot {
    left: 50%;
    transform: translate(-50%, 0);
  }

  .timeline__item:nth-child(odd) .timeline__content {
    padding-right: var(--space-8);
  }

  .timeline__item:nth-child(even) .timeline__content {
    padding-left: var(--space-8);
  }

  /* Project grid: 2 columns */
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }
}

/* ---------- Desktop: 1024px+ ---------- */
@media (min-width: 1024px) {
  .project-grid--3col {
    grid-template-columns: repeat(3, 1fr);
  }

  .nav__links {
    gap: var(--space-8);
  }
}

/* ---------- Wide: 1280px+ ---------- */
@media (min-width: 1280px) {
  /* Content max-width naturally applies */
}

/* ---------- Extra wide: 1440px+ ---------- */
@media (min-width: 1440px) {
  /* Adjustments for very large screens if needed */
}

/* ---------- Touch devices: no hover ---------- */
@media (hover: none) {
  .project-card__content {
    transform: translateY(0);
  }

  .project-card__overlay {
    background: linear-gradient(
      to top,
      rgba(0, 0, 0, 0.9) 0%,
      rgba(0, 0, 0, 0.3) 60%,
      rgba(0, 0, 0, 0) 100%
    );
  }
}