/* Portfolio Styles
  - Mobile-first, responsive design using Flexbox/Grid
  - Light/Dark theme with CSS variables
  - Smooth scrolling, subtle transitions, and accessible focus states
*/

/* ------------------------------
   Base + Theme Tokens
------------------------------ */
:root {
  --bg: #ffffff;
  --bg-elev: #f7f7fb;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --accent: #4f46e5; /* indigo-600 */
  --accent-2: #06b6d4; /* cyan-500 */
  --card: #ffffff;
  --shadow: 0 8px 30px rgba(2, 6, 23, 0.08);
  --radius: 14px;

  --font-sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --container: 1100px;

  /* Spacing scale */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
}

html[data-theme="dark"] {
  --bg: #0b1220;
  --bg-elev: #0f172a;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --border: #1f2937;
  --accent: #7c3aed; /* violet-600 */
  --accent-2: #06b6d4;
  --card: #0f172a;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

/* Global reset/minimal normalize */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at -10% -20%, rgba(79,70,229,0.10), transparent 60%),
    radial-gradient(900px 500px at 110% 10%, rgba(6,182,212,0.10), transparent 60%),
    var(--bg);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.section {
  padding-block: var(--space-20);
  scroll-margin-top: 80px; /* for sticky header offset */
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}
.section-header h2 {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  line-height: 1.2;
  margin: 0 0 var(--space-2) 0;
}
.section-subtitle {
  color: var(--muted);
  margin: 0;
}

/* Screen reader only utility */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -999px;
  top: -999px;
  background: var(--text);
  color: var(--bg);
  padding: var(--space-2) var(--space-3);
  border-radius: 8px;
}
.skip-link:focus { left: var(--space-4); top: var(--space-4); z-index: 9999; }

/* ------------------------------
   Header / Nav
------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: var(--space-4);
}

.brand {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-weight: 700; color: var(--text);
  text-decoration: none;
}
.brand-mark { color: var(--accent); font-size: 1.2rem; }
.brand-text { letter-spacing: 0.2px; }

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Hamburger (mobile) */
.hamburger {
  inline-size: 40px; block-size: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  display: grid; place-items: center;
  box-shadow: var(--shadow);
}
.hamburger-line {
  display: block;
  width: 20px; height: 2px;
  background: var(--text);
  position: relative;
}
.hamburger-line + .hamburger-line { margin-top: 4px; }

/* Nav links */
.nav-links {
  position: fixed;
  inset: 64px 0 auto 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  list-style: none; margin: 0; padding: var(--space-4);
  display: grid; gap: var(--space-2);
}

@media (min-width: 900px) {
  .hamburger { display: none; }
  .nav-links {
    position: static;
    inset: auto;
    background: transparent;
    border: 0;
    opacity: 1; transform: none; pointer-events: all;
    display: flex; gap: var(--space-2);
    padding: 0;
  }
}

.nav-link {
  display: inline-block;
  padding: .55rem .8rem;
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}
.nav-link:hover,
.nav-link:focus-visible { background: var(--bg-elev); text-decoration: none; }
.nav-link.active {
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  color: var(--text);
  outline: 1px solid color-mix(in oklab, var(--accent) 35%, transparent);
}

/* Open state for mobile menu */
body[data-nav-open="true"] .nav-links {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

/* Theme toggle button */
.icon-btn {
  inline-size: 40px; block-size: 40px;
  display: inline-grid; place-items: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow);
}
.icon {
  width: 20px; height: 20px; fill: currentColor;
}
.icon.moon { display: none; }
html[data-theme="dark"] .icon.sun { display: none; }
html[data-theme="dark"] .icon.moon { display: block; }

/* ------------------------------
   Hero
------------------------------ */
.hero {
  padding-block: var(--space-20);
}
.hero-inner {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}
@media (min-width: 900px) {
  .hero-inner {
    grid-template-columns: 1.1fr .9fr;
  }
}

.eyebrow {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin: 0 0 var(--space-1);
}

.hero-title {
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.1;
  margin: 0 0 var(--space-2);
}
.hero-subtitle {
  color: var(--muted);
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  margin: 0 0 var(--space-4);
}
.hero-tagline { margin: 0 0 var(--space-6); color: var(--muted); }

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

.hero-media { display: grid; place-items: center; }
.avatar-wrap {
  --size: min(60vw, 280px);
  width: var(--size); height: var(--size);
  border-radius: 50%;
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent) 35%, transparent), color-mix(in oklab, var(--accent-2) 35%, transparent));
  padding: 6px;
  box-shadow: var(--shadow);
}
.avatar {
  width: 100%; height: 100%; object-fit: cover; border-radius: 50%;
  background: var(--card);
}

/* Subtle scroll indicator */
.scroll-indicator {
  text-align: center;
  margin-top: var(--space-8);
  color: var(--muted);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  opacity: .7;
}

/* ------------------------------
   About
------------------------------ */
.about-grid {
  display: grid;
  gap: var(--space-8);
}
@media (min-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr 1.6fr;
    align-items: center;
  }
}
.about-photo {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.about-content p { margin: 0 0 var(--space-4); }
.about-highlights {
  display: grid; gap: var(--space-2);
  padding: 0; margin: 0 0 var(--space-4);
  list-style: "▹  ";
}
.about-actions { display: flex; gap: var(--space-3); }

/* Experience timeline (minimal styles to match your current design) */
.experience .timeline {
  display: grid;
  gap: 1rem;
}
.experience .timeline-item {
  background: var(--card, #fff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: var(--radius, 12px);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow, 0 8px 30px rgba(2,6,23,.08));
}
.experience .timeline-meta {
  margin-bottom: .5rem;
}
.experience .timeline-role {
  margin: 0 0 .25rem 0;
  font-size: 1.05rem;
}
.experience .timeline-org,
.experience .timeline-date {
  margin: 0;
  color: var(--muted, #475569);
  font-size: .95rem;
}
.experience .timeline-points {
  margin: .5rem 0 0;
  padding-left: 1.25rem;
}
.experience .timeline-points li {
  margin: .25rem 0;
}

/* ------------------------------
   Skills
------------------------------ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}
.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}
.skill-card:hover { transform: translateY(-3px); }
.skill-card h3 { margin: 0 0 var(--space-3); font-size: 1.05rem; }
.progress {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  height: 10px;
  margin-bottom: var(--space-2);
}
.progress-bar {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}
.level { color: var(--muted); font-size: .9rem; margin: 0; }

/* ------------------------------
   Projects
------------------------------ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-4);
}
.project-card {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: var(--space-3);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: clip;
  box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}
.project-card:hover { transform: translateY(-4px); }
.project-media {
  aspect-ratio: 16 / 11;
  overflow: hidden;
}
.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.project-content { padding: var(--space-4); }
.project-content h3 { margin: 0 0 var(--space-2); }
.project-content p { margin: 0 0 var(--space-4); color: var(--muted); }
.project-links { display: flex; gap: var(--space-2); flex-wrap: wrap; }

/* ------------------------------
   Certifications
------------------------------ */
.cert-list {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.cert-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow);
}
.cert-content h3 { margin: 0 0 var(--space-2); }
.cert-content .issuer, .cert-content .date { margin: 0; color: var(--muted); }

/* ------------------------------
   Contact
------------------------------ */
.contact-grid {
  display: grid; gap: var(--space-8);
}
@media (min-width: 900px) {
  .contact-grid { grid-template-columns: 2fr 1fr; align-items: start; }
}
.contact-form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow);
}
.form-field { display: grid; gap: .45rem; margin-bottom: var(--space-4); }
label { font-weight: 600; }
input, textarea {
  width: 100%;
  padding: .85rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
input:focus, textarea:focus {
  border-color: color-mix(in oklab, var(--accent) 50%, var(--border));
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 25%, transparent);
}
.form-actions { display: grid; gap: var(--space-2); }
.form-note { color: var(--muted); margin: 0; font-size: .9rem; }
.contact-aside h3 { margin-top: 0; }
.social-list { display: flex; gap: var(--space-3); list-style: none; padding: 0; margin: var(--space-2) 0 0; }
.social-list a {
  inline-size: 44px; block-size: 44px; display: grid; place-items: center;
  border-radius: 12px; border: 1px solid var(--border); background: var(--card);
  color: var(--text); box-shadow: var(--shadow);
}
.social-list a:hover { background: var(--bg-elev); }

/* ------------------------------
   Footer
------------------------------ */
.site-footer {
  padding-block: var(--space-8);
  border-top: 1px solid var(--border);
  color: var(--muted);
  background: color-mix(in oklab, var(--bg) 94%, transparent);
}
.footer-inner {
  display: grid; gap: var(--space-2);
  text-align: center;
}

/* ------------------------------
   Buttons
------------------------------ */
.btn {
  display: inline-block;
  font-weight: 600;
  border-radius: 12px;
  padding: .7rem 1.05rem;
  border: 1px solid transparent;
  transition: transform .1s ease, background-color .2s ease, color .2s ease, border-color .2s ease;
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  filter: brightness(1.05);
}
.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover {
  background: var(--bg-elev);
}

/* ------------------------------
   Reveal on scroll
------------------------------ */
.reveal { 
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; }
  * { transition: none !important; }
}

/* ------------------------------
   Noscript
------------------------------ */
.noscript {
  background: #fde68a; color: #78350f;
  padding: var(--space-4); text-align: center;
}

/* ------------------------------
   Utility
------------------------------ */
.hidden { display: none !important; }

@media print {
  header, nav, .site-header, .site-footer, .hero-actions, .contact-form .form-actions, .social-list {
    display: none !important;
  }
  .container { max-width: none !important; }
  body { background: #ffffff !important; }
}

/* ------------------------------
   Projects Slider Updates
------------------------------ */
.project-counter {
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

.projects-slider-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  position: relative;
}

.slider-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.2rem;
  min-width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  z-index: 2;
  transition: background-color 0.2s, transform 0.2s;
  flex-shrink: 0;
}

.slider-btn:hover {
  background: var(--bg-elev);
  transform: scale(1.05);
}

/* Override the standard grid specifically for the slider */
.card-grid.slider-container {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  scrollbar-width: none; /* Hides scrollbar in Firefox */
  -ms-overflow-style: none; /* Hides scrollbar in IE/Edge */
  padding-bottom: var(--space-4); /* Room for shadow */
  padding-top: var(--space-2);
}

.card-grid.slider-container::-webkit-scrollbar {
  display: none; /* Hides scrollbar in Chrome/Safari/Edge */
}

.card-grid.slider-container .project-card {
  flex: 0 0 calc(100% - var(--space-4)); /* 1 card on mobile */
  max-width: 320px; /* Fixed width on desktop */
  scroll-snap-align: start;
}

/* ------------------------------
   Read More / Show Less Toggle
------------------------------ */
.project-desc {
  display: -webkit-box;
  -webkit-line-clamp: 2; /* Truncates the text to ~2 lines (about 30%) */
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-4);
}

.project-desc.expanded {
  -webkit-line-clamp: unset; /* Shows all text when expanded */
}

.read-more-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0;
  margin-bottom: var(--space-4);
  display: inline-block;
  font-family: inherit;
}

.read-more-btn:hover {
  text-decoration: underline;
}