/* ==========================================================================
   Portfolio — Custom Styles
   Supplements Tailwind CDN. Handles animations, scroll behavior,
   accessibility, and elements Tailwind CDN cannot express.
   ========================================================================== */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  --color-background: hsl(40, 33%, 96%);
  --color-foreground: hsl(30, 10%, 12%);
  --color-card: hsl(38, 30%, 93%);
  --color-primary: hsl(30, 10%, 12%);
  --color-primary-fg: hsl(40, 33%, 96%);
  --color-secondary: hsl(35, 20%, 88%);
  --color-muted: hsl(35, 15%, 90%);
  --color-muted-fg: hsl(30, 5%, 45%);
  --color-accent: hsl(18, 76%, 48%);
  --color-accent-fg: hsl(0, 0%, 100%);
  --color-border: hsl(30, 15%, 85%);
  --color-destructive: hsl(0, 84%, 60%);
  --radius: 0.75rem;
}

/* --- Base --- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem; /* account for fixed navbar */
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection {
  background-color: var(--color-accent);
  color: var(--color-accent-fg);
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  z-index: 9999;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: var(--color-accent-fg);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  text-decoration: none;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* --- Keyframe Animations --- */
@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes mouseScroll {
  0%, 100% {
    opacity: 1;
    transform: translateY(0);
  }
  50% {
    opacity: 0.4;
    transform: translateY(6px);
  }
}

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

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

/* --- Scroll-triggered fade-in (JS adds .is-visible) --- */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Fade from left */
.fade-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Fade from right */
.fade-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Scale in (badges, pills) */
.scale-in {
  opacity: 0;
  transform: scale(0.88);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.scale-in.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* Staggered delays for children */
.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }
.fade-up-delay-5 { transition-delay: 0.5s; }

/* --- Scroll Indicator --- */
.scroll-indicator {
  animation: mouseScroll 2s ease-in-out infinite;
}

/* --- Decorative SVG Spin --- */
.slow-spin {
  animation: slowSpin 20s linear infinite;
}

/* --- FAQ Accordion (details/summary) --- */
details summary {
  cursor: pointer;
  list-style: none;
}

details summary::-webkit-details-marker {
  display: none;
}

details[open] > summary ~ * {
  animation: fadeInUp 0.3s ease-out;
}

/* Chevron rotation */
details summary .faq-chevron {
  transition: transform 0.2s ease;
}

details[open] summary .faq-chevron {
  transform: rotate(180deg);
}

/* --- Case Study Expand --- */
.case-study-content {
  animation: fadeInUp 0.4s ease-out;
}

/* --- Navbar Scroll State (JS toggles .scrolled) --- */
.navbar-scrolled {
  border-bottom: 1px solid var(--color-border);
  background-color: hsla(40, 33%, 96%, 0.95);
}

/* --- Timeline vertical line --- */
.timeline-line {
  position: absolute;
  left: 0.75rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-dot {
  position: absolute;
  left: 0.375rem;
  top: 0.375rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 2px solid var(--color-background);
}

/* --- Image Placeholders --- */
.img-placeholder {
  background: linear-gradient(135deg, hsla(18, 76%, 48%, 0.08), var(--color-card));
}

.video-placeholder {
  background: linear-gradient(135deg, hsla(30, 10%, 12%, 0.08), var(--color-card));
}

/* --- Prose (blog articles) --- */
.prose h2 { margin-top: 2em; margin-bottom: 0.75em; }
.prose h3 { margin-top: 1.5em; margin-bottom: 0.5em; }
.prose p { margin-bottom: 1.25em; line-height: 1.75; }
.prose ul, .prose ol { margin-bottom: 1.25em; padding-left: 1.5em; }
.prose li { margin-bottom: 0.5em; }
.prose code {
  background: var(--color-muted);
  padding: 0.125em 0.375em;
  border-radius: 0.25rem;
  font-size: 0.875em;
}
.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.prose a:hover { opacity: 0.8; }
.prose blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: 1rem;
  margin: 1.5em 0;
  color: var(--color-muted-fg);
  font-style: italic;
}

/* --- Print Styles --- */
@media print {
  a[href^="http"]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
  nav, .scroll-indicator, .slow-spin, footer { display: none; }
  .fade-up, .fade-left, .fade-right, .scale-in { opacity: 1 !important; transform: none !important; }
}

/* --- Reduced Motion (Accessibility) --- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }
}