/* ================================================
   ARMANDO DIAZ — PERSONAL SITE
   Main Design System Stylesheet
   ================================================ */

/* ------------------------------------------------
   1. CSS CUSTOM PROPERTIES
   ------------------------------------------------ */
:root {
  /* Colors */
  --bg-primary: #312f2f;
  --bg-secondary: #3d3a3a;
  --bg-tertiary: #4a4646;
  --accent-warm: #d7907b;
  --accent-cream: #f3f9d2;
  --text-primary: #f3f9d2;
  --text-secondary: #c4b8b8;
  --text-tertiary: #7a6f6f;
  --border: #4a4646;
  --glow-warm: rgba(215, 144, 123, 0.15);
  --glow-cream: rgba(243, 249, 210, 0.08);

  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'IBM Plex Mono', 'Courier New', monospace;

  /* Fluid Type Scale */
  --text-xs: clamp(0.6875rem, 0.625rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-base: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);
  --text-lg: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --text-xl: clamp(1.25rem, 1rem + 1.25vw, 1.75rem);
  --text-2xl: clamp(1.75rem, 1.25rem + 2.5vw, 3rem);
  --text-3xl: clamp(2.5rem, 1.5rem + 5vw, 4.5rem);
  --text-4xl: clamp(3rem, 1.5rem + 7.5vw, 6rem);
  --text-hero: clamp(3rem, 2rem + 5vw, 7.5rem);

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

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 200ms;
  --duration-normal: 400ms;
  --duration-slow: 600ms;
}

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

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

::-moz-selection {
  background: var(--accent-warm);
  color: var(--bg-primary);
}

/* Custom scrollbar (Webkit) */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-warm);
}

/* Inline SVGs inside links should not block */
a svg,
button svg {
  display: inline-block;
}

/* ------------------------------------------------
   3. GRAIN TEXTURE OVERLAY
   ------------------------------------------------ */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.045;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
}

/* ------------------------------------------------
   4. TYPOGRAPHY HELPERS
   ------------------------------------------------ */
.font-display {
  font-family: var(--font-display);
}

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

.text-cream {
  color: var(--accent-cream);
}

.text-warm {
  color: var(--accent-warm);
}

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

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

/* ------------------------------------------------
   5. NAVIGATION
   ------------------------------------------------ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  background: rgba(49, 47, 47, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  overflow: visible;
}

.nav__name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--accent-cream);
  text-decoration: none;
  letter-spacing: 0.02em;
}

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

.nav__link {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  position: relative;
  padding: 4px 0;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--accent-warm);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-normal) var(--ease-out);
}

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

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

.nav__link--active {
  color: var(--accent-warm);
}

.nav__link--active::after {
  transform: scaleX(1);
  background: var(--accent-warm);
}

/* Mobile hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
  background: none;
  border: none;
}

.nav__toggle-line {
  width: 24px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform var(--duration-fast) var(--ease-out),
    opacity var(--duration-fast) var(--ease-out);
}

/* ------------------------------------------------
   6. FOOTER
   ------------------------------------------------ */
.footer {
  background: var(--bg-primary);
  padding: 40px var(--space-lg);
  border-top: 1px solid var(--border);
}

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

.footer__name {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

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

.footer__social-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

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

.footer__social-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* ------------------------------------------------
   7. SECTION LAYOUT UTILITIES
   ------------------------------------------------ */
.section {
  padding: var(--space-xl) var(--space-lg);
}

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

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

.section__header {
  position: relative;
  margin-bottom: var(--space-lg);
}

.section__ghost-number {
  font-family: var(--font-display);
  font-size: clamp(4rem, 3rem + 5vw, 8rem);
  font-weight: 900;
  color: var(--text-tertiary);
  opacity: 0.15;
  position: absolute;
  top: -0.3em;
  left: -0.05em;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--accent-cream);
  position: relative;
}

.section__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

/* ------------------------------------------------
   7b. PAGE HEADER (shared across inner pages)
   ------------------------------------------------ */
.page-header {
  padding: calc(var(--nav-height) + var(--space-xl)) var(--space-lg) var(--space-lg);
  position: relative;
}

.page-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
}

.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 900;
  color: var(--accent-cream);
  position: relative;
}

.page-header__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

.page-header__desc {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-tertiary);
  margin-top: 8px;
}

/* ------------------------------------------------
   8. BUTTON STYLES
   ------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  border-radius: 8px;
  border: 1px solid var(--accent-warm);
  background: transparent;
  color: var(--accent-warm);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

.btn:hover {
  background: var(--accent-warm);
  color: var(--bg-primary);
  transform: scale(1.02);
}

.btn--primary {
  background: var(--accent-warm);
  color: var(--bg-primary);
  border-color: var(--accent-warm);
}

.btn--primary:hover {
  background: var(--accent-cream);
  border-color: var(--accent-cream);
  color: var(--bg-primary);
  transform: scale(1.02);
}

.btn--large {
  padding: 16px 48px;
  font-family: var(--font-display);
  font-size: 18px;
  font-style: italic;
  text-transform: none;
  letter-spacing: normal;
}

/* ------------------------------------------------
   9. CARD STYLES
   ------------------------------------------------ */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px;
  transition: transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--glow-warm);
  border-color: var(--accent-warm);
}

.card__category {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-warm);
  margin-bottom: var(--space-sm);
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--accent-cream);
  margin-bottom: 8px;
}

.card__description {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-block;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 4px;
  padding: 4px 10px;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.02em;
}

/* ------------------------------------------------
   10. LINK STYLES
   ------------------------------------------------ */
.link-arrow {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--accent-warm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  transition: gap var(--duration-fast) var(--ease-out);
}

.link-arrow::after {
  content: '\2192';
  transition: transform var(--duration-fast) var(--ease-out);
}

.link-arrow:hover::after {
  transform: translateX(4px);
}

/* ------------------------------------------------
   11. SCROLL ANIMATION UTILITY
   ------------------------------------------------ */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
  transition-delay: var(--stagger-delay, 0ms);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ------------------------------------------------
   12. RESPONSIVE — MOBILE FIRST
   ------------------------------------------------ */

/* Mobile nav */
@media (max-width: 767px) {
  .nav {
    padding: 0 var(--space-md);
  }

  .nav__toggle {
    display: flex;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    width: 260px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-md);
    background: rgba(49, 47, 47, 0.98);
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }

  .nav__links--open {
    display: flex;
  }

  .nav__link {
    display: block;
    width: 100%;
    padding: 14px 0;
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--border);
  }

  .section {
    padding: var(--space-lg) var(--space-md);
  }

  .page-header {
    padding: calc(var(--nav-height) + var(--space-lg)) var(--space-md) var(--space-md);
  }
}

/* Focus-visible for keyboard navigation */
.nav__link:focus-visible {
  outline: 2px solid var(--accent-warm);
  outline-offset: 4px;
  border-radius: 2px;
}

.btn:focus-visible {
  outline: 2px solid var(--accent-warm);
  outline-offset: 4px;
}

/* Screen reader only utility */
.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;
}

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

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }
}