/* =========================================================
   UJJWAL BASKOTA — PORTFOLIO STYLESHEET
   Organized by: Reset -> Variables -> Base -> Layout ->
   Components (per section) -> Animations -> Responsive
   ========================================================= */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { padding: 0; margin: 0; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
input, textarea, button { font-family: inherit; font-size: 1rem; }

/* ---------- Variables (dark theme = default, mirrors SITE_CONFIG in script.js) ---------- */
:root {
  --primary-color: #7C3AED;
  --secondary-color: #06B6D4;
  --background-color: #0B1020;
  --background-alt: #0E1526;
  --card-color: #111827;
  --text-color: #F9FAFB;
  --muted-text-color: #9CA3AF;
  --border-color: rgba(255, 255, 255, 0.09);

  --radius-small: 10px;
  --radius-medium: 18px;
  --radius-large: 28px;

  --transition: 0.3s ease;
  --font-family: "Inter", system-ui, -apple-system, sans-serif;

  --shadow-card: 0 20px 45px -25px rgba(0, 0, 0, 0.65);
  --container-width: 1160px;
}

[data-theme="light"] {
  --background-color: #F7F7FB;
  --background-alt: #EFEFF7;
  --card-color: #FFFFFF;
  --text-color: #14151F;
  --muted-text-color: #5B5E6E;
  --border-color: rgba(15, 15, 30, 0.09);
  --shadow-card: 0 20px 45px -28px rgba(20, 20, 40, 0.28);
}

/* ---------- Base ---------- */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  background: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 112px 0; }
.section-alt { background: var(--background-alt); }

h1, h2, h3 { font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; }
h2 { font-size: clamp(1.9rem, 3.2vw, 2.6rem); }
h3 { font-size: 1.15rem; }
.section-sub { color: var(--muted-text-color); max-width: 560px; margin-top: 12px; }
.lead { font-size: 1.1rem; color: var(--text-color); }

.eyebrow-label {
  color: var(--secondary-color);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.section-head { margin-bottom: 48px; max-width: 640px; }

:focus-visible {
  outline: 2px solid var(--secondary-color);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--card-color);
  color: var(--text-color);
  padding: 10px 16px;
  z-index: 2000;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-small);
  font-weight: 600;
  font-size: 0.96rem;
  border: 1px solid transparent;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff;
  box-shadow: 0 12px 30px -12px color-mix(in srgb, var(--primary-color) 70%, transparent);
}
.btn-outline {
  border-color: var(--border-color);
  color: var(--text-color);
  background: transparent;
}
.btn-outline:hover { border-color: var(--secondary-color); }
.btn-ghost { color: var(--secondary-color); }
.btn-ghost:hover { text-decoration: underline; }
.btn-block { width: 100%; }

/* ---------- Preloader ---------- */
#preloader {
  position: fixed; inset: 0; z-index: 3000;
  background: var(--background-color);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
#preloader.loaded { opacity: 0; visibility: hidden; pointer-events: none; }
.preloader-mark {
  font-weight: 800; font-size: 1.6rem; letter-spacing: 0.04em;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.preloader-bar { width: 140px; height: 3px; background: var(--border-color); border-radius: 4px; overflow: hidden; }
.preloader-bar span {
  display: block; height: 100%; width: 40%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  animation: preload-move 1.1s ease-in-out infinite;
}
@keyframes preload-move { 0% { transform: translateX(-100%); } 100% { transform: translateX(250%); } }

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: transparent;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: color-mix(in srgb, var(--background-color) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--border-color);
}
.navbar {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-logo { font-weight: 800; font-size: 1.05rem; text-transform: lowercase; letter-spacing: -0.01em; }
.nav-menu { display: flex; gap: 30px; }
.nav-link {
  position: relative;
  font-size: 0.95rem; font-weight: 500; color: var(--muted-text-color);
  padding: 6px 0; transition: color var(--transition);
}
.nav-link::after {
  content: ""; position: absolute; left: 0; bottom: -4px; height: 2px; width: 0;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  transition: width var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--text-color); }
.nav-link.active::after { width: 100%; }

.theme-toggle {
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--border-color); background: var(--card-color);
  color: var(--text-color); display: flex; align-items: center; justify-content: center;
  transition: border-color var(--transition), transform var(--transition);
}
.theme-toggle:hover { transform: translateY(-2px); border-color: var(--secondary-color); }
.icon-sun { display: none; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 38px; height: 38px; background: transparent; border: none;
}
.nav-toggle span { width: 100%; height: 2px; background: var(--text-color); border-radius: 2px; transition: transform var(--transition), opacity var(--transition); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 168px 0 96px; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: 0; overflow: hidden; }
.hero-circuit { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.35; }
.hero-glow-a { width: 420px; height: 420px; background: var(--primary-color); top: -140px; right: -100px; animation: drift 14s ease-in-out infinite; }
.hero-glow-b { width: 340px; height: 340px; background: var(--secondary-color); bottom: -120px; left: -80px; animation: drift 16s ease-in-out infinite reverse; }
@keyframes drift { 0%, 100% { transform: translate(0,0); } 50% { transform: translate(30px, -20px); } }

.hero-grid {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.1fr 0.8fr; gap: 56px; align-items: center;
}
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--border-color);
  font-size: 0.85rem; color: var(--muted-text-color); margin-bottom: 22px;
  background: var(--card-color);
}
.badge-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--secondary-color); box-shadow: 0 0 0 4px color-mix(in srgb, var(--secondary-color) 25%, transparent); }
.hero-title { font-size: clamp(2.3rem, 5vw, 3.6rem); margin-bottom: 16px; }
.hero-subtitle { color: var(--secondary-color); font-weight: 600; font-size: 1.1rem; min-height: 1.6em; margin-bottom: 16px; }
.typing-cursor { animation: blink 0.9s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero-desc { color: var(--muted-text-color); max-width: 520px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 30px; }

.hero-socials { display: flex; gap: 12px; margin-bottom: 44px; }
.hero-socials a {
  width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center; color: var(--muted-text-color);
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}
.hero-socials a:hover { border-color: var(--secondary-color); color: var(--secondary-color); transform: translateY(-2px); }
.hero-socials svg { width: 17px; height: 17px; }

.hero-stats { display: flex; gap: 40px; flex-wrap: wrap; }
.stat-num { display: block; font-size: 1.9rem; font-weight: 800; }
.stat-label { display: block; color: var(--muted-text-color); font-size: 0.85rem; margin-top: 4px; }

.hero-visual { display: flex; justify-content: center; }
.hero-photo-frame {
  position: relative; width: min(100%, 340px); aspect-ratio: 7/8;
  border-radius: 32% 68% 62% 38% / 45% 40% 60% 55%;
  overflow: hidden; border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
}
.hero-photo-frame img { width: 100%; height: 100%; object-fit: cover; }
.hero-photo-frame::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 60%, color-mix(in srgb, var(--background-color) 55%, transparent));
}

.scroll-indicator {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  width: 26px; height: 42px; border: 2px solid var(--border-color); border-radius: 20px;
  display: flex; justify-content: center; padding-top: 8px; z-index: 1;
}
.scroll-indicator span { width: 4px; height: 8px; border-radius: 2px; background: var(--secondary-color); animation: scroll-dot 1.6s ease-in-out infinite; }
@keyframes scroll-dot { 0% { opacity: 1; transform: translateY(0); } 70% { opacity: 0; transform: translateY(12px); } 100% { opacity: 0; } }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 64px; align-items: center; }
.about-image-wrap { border-radius: var(--radius-large); overflow: hidden; border: 1px solid var(--border-color); box-shadow: var(--shadow-card); }
.about-image-wrap img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/5; }
.about-content h2 { margin-bottom: 16px; }
.about-content p { color: var(--muted-text-color); margin-bottom: 16px; }
.about-content .lead { color: var(--text-color); }

.about-info-card {
  background: var(--card-color); border: 1px solid var(--border-color); border-radius: var(--radius-medium);
  padding: 22px 26px; margin: 26px 0; display: grid; gap: 12px;
}
.info-row { display: flex; justify-content: space-between; gap: 16px; font-size: 0.95rem; border-bottom: 1px solid var(--border-color); padding-bottom: 10px; }
.info-row:last-child { border-bottom: none; padding-bottom: 0; }
.info-label { color: var(--muted-text-color); }
.info-value { font-weight: 600; text-align: right; }
.about-actions { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 56px; }
.skill-card { background: var(--card-color); border: 1px solid var(--border-color); border-radius: var(--radius-medium); padding: 26px; }
.skill-card h4 { font-weight: 700; margin-bottom: 18px; }
.skill-row { margin-bottom: 16px; }
.skill-row:last-child { margin-bottom: 0; }
.skill-row-top { display: flex; justify-content: space-between; font-size: 0.9rem; margin-bottom: 7px; }
.skill-row-top span:last-child { color: var(--muted-text-color); }
.skill-bar-track { height: 8px; background: var(--border-color); border-radius: 999px; overflow: hidden; }
.skill-bar-fill {
  height: 100%; width: 0%; border-radius: 999px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transition: width 1.1s cubic-bezier(.2,.8,.2,1);
}

.skills-secondary { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.skills-column h3 { margin-bottom: 16px; }
.badge-list { display: flex; flex-wrap: wrap; gap: 10px; }
.badge-list li {
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--border-color);
  font-size: 0.85rem; color: var(--muted-text-color);
}
.soft-list li { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 12px; color: var(--muted-text-color); font-size: 0.95rem; }
.soft-list li::before { content: ""; width: 6px; height: 6px; margin-top: 8px; border-radius: 50%; background: var(--secondary-color); flex-shrink: 0; }

/* ---------- Services ---------- */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-card {
  background: var(--card-color); border: 1px solid var(--border-color); border-radius: var(--radius-medium);
  padding: 30px; transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  display: flex; flex-direction: column;
}
.service-card:hover { transform: translateY(-6px); border-color: var(--secondary-color); box-shadow: var(--shadow-card); }
.service-icon {
  width: 46px; height: 46px; border-radius: var(--radius-small); margin-bottom: 18px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary-color) 22%, transparent), color-mix(in srgb, var(--secondary-color) 22%, transparent));
  color: var(--secondary-color);
}
.service-card h3 { margin-bottom: 10px; }
.service-card p.service-desc { color: var(--muted-text-color); font-size: 0.94rem; margin-bottom: 16px; }
.service-features { margin-bottom: 20px; display: grid; gap: 8px; }
.service-features li { display: flex; gap: 8px; font-size: 0.88rem; color: var(--muted-text-color); }
.service-features li::before { content: "\2713"; color: var(--secondary-color); font-weight: 700; }
.service-footer { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 14px; border-top: 1px solid var(--border-color); }
.service-price { font-weight: 700; font-size: 0.92rem; }
.service-link { color: var(--secondary-color); font-weight: 600; font-size: 0.9rem; }
.service-link:hover { text-decoration: underline; }

/* ---------- Projects ---------- */
.project-filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 34px; }
.filter-btn {
  padding: 9px 18px; border-radius: 999px; border: 1px solid var(--border-color);
  background: transparent; color: var(--muted-text-color); font-size: 0.88rem; font-weight: 600;
  transition: all var(--transition);
}
.filter-btn:hover { color: var(--text-color); }
.filter-btn.active { background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); color: #fff; border-color: transparent; }

.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.project-card {
  background: var(--card-color); border: 1px solid var(--border-color); border-radius: var(--radius-medium);
  overflow: hidden; transition: transform var(--transition), box-shadow var(--transition);
}
.project-card.hidden-item { display: none; }
.project-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); }
.project-image { position: relative; aspect-ratio: 16/10; overflow: hidden; }
.project-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.project-card:hover .project-image img { transform: scale(1.08); }
.project-overlay {
  position: absolute; inset: 0; background: linear-gradient(180deg, transparent 30%, rgba(0,0,0,0.75));
  display: flex; align-items: flex-end; padding: 16px; opacity: 0; transition: opacity var(--transition);
}
.project-card:hover .project-overlay { opacity: 1; }
.project-overlay span { color: #fff; font-size: 0.85rem; font-weight: 600; }
.project-body { padding: 22px; }
.project-category { color: var(--secondary-color); font-size: 0.8rem; font-weight: 600; margin-bottom: 6px; display: block; }
.project-body h3 { margin-bottom: 8px; }
.project-body p { color: var(--muted-text-color); font-size: 0.9rem; margin-bottom: 14px; }
.project-tech { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.project-tech span { font-size: 0.75rem; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border-color); color: var(--muted-text-color); }
.project-actions { display: flex; gap: 10px; }
.project-actions a, .project-actions button { flex: 1; text-align: center; padding: 9px 12px; font-size: 0.85rem; border-radius: var(--radius-small); }

.empty-state { text-align: center; color: var(--muted-text-color); padding: 40px 0; }

/* ---------- Timeline ---------- */
.timeline { position: relative; max-width: 780px; margin: 0 auto; padding-left: 32px; border-left: 2px solid var(--border-color); }
.timeline-item { position: relative; padding-bottom: 44px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ""; position: absolute; left: -39px; top: 4px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--background-color); border: 2px solid var(--secondary-color);
}
.timeline-date { color: var(--secondary-color); font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; display: block; }
.timeline-item h3 { margin-bottom: 2px; }
.timeline-org { color: var(--muted-text-color); font-size: 0.92rem; margin-bottom: 10px; display: block; }
.timeline-item p.timeline-desc { color: var(--muted-text-color); font-size: 0.94rem; margin-bottom: 12px; }
.timeline-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.timeline-tags span { font-size: 0.75rem; padding: 4px 10px; border-radius: 999px; background: var(--card-color); border: 1px solid var(--border-color); color: var(--muted-text-color); }

/* ---------- Testimonials ---------- */
.testimonial-slider { max-width: 720px; margin: 0 auto; }
.testimonial-track { position: relative; min-height: 260px; }
.testimonial-card {
  position: absolute; inset: 0; opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  background: var(--card-color); border: 1px solid var(--border-color); border-radius: var(--radius-large);
  padding: 40px; text-align: center;
}
.testimonial-card.active { opacity: 1; visibility: visible; transform: translateY(0); position: relative; }
.testimonial-stars { color: var(--secondary-color); margin-bottom: 16px; font-size: 1.05rem; letter-spacing: 2px; }
.testimonial-text { font-size: 1.05rem; margin-bottom: 22px; }
.testimonial-person { display: flex; align-items: center; justify-content: center; gap: 12px; }
.testimonial-person img { width: 46px; height: 46px; border-radius: 50%; object-fit: cover; }
.testimonial-name { font-weight: 700; font-size: 0.95rem; }
.testimonial-role { color: var(--muted-text-color); font-size: 0.85rem; }

.slider-controls { display: flex; align-items: center; justify-content: center; gap: 20px; margin-top: 26px; }
.slider-btn {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border-color);
  background: var(--card-color); color: var(--text-color); font-size: 1.3rem; display: flex; align-items: center; justify-content: center;
  transition: border-color var(--transition);
}
.slider-btn:hover { border-color: var(--secondary-color); }
.slider-dots { display: flex; gap: 8px; }
.slider-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border-color); border: none; padding: 0; }
.slider-dot.active { background: var(--secondary-color); width: 22px; border-radius: 6px; transition: width var(--transition); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 60px; }
.contact-info h2 { margin-bottom: 14px; }
.contact-list { margin: 26px 0; display: grid; gap: 16px; }
.contact-list li { display: flex; align-items: center; gap: 12px; }
.contact-icon {
  width: 38px; height: 38px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: var(--card-color); border: 1px solid var(--border-color); color: var(--secondary-color); flex-shrink: 0;
}
.contact-form { background: var(--card-color); border: 1px solid var(--border-color); border-radius: var(--radius-large); padding: 36px; }
.form-row { margin-bottom: 20px; }
.form-row label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 8px; }
.form-row input, .form-row textarea {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-small); border: 1px solid var(--border-color);
  background: var(--background-color); color: var(--text-color); transition: border-color var(--transition);
  resize: vertical;
}
.form-row input:focus, .form-row textarea:focus { border-color: var(--secondary-color); }
.form-row.has-error input, .form-row.has-error textarea { border-color: #f87171; }
.form-error { display: block; color: #f87171; font-size: 0.8rem; margin-top: 6px; min-height: 1em; }
.form-success { margin-top: 16px; color: #34d399; font-size: 0.9rem; text-align: center; }
.btn-spinner {
  width: 16px; height: 16px; border-radius: 50%; border: 2px solid rgba(255,255,255,0.4); border-top-color: #fff;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Footer ---------- */
.site-footer { background: var(--background-alt); border-top: 1px solid var(--border-color); padding: 72px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { color: var(--muted-text-color); font-size: 0.9rem; margin: 16px 0 20px; max-width: 320px; }
.footer-col h3 { font-size: 0.95rem; margin-bottom: 16px; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { color: var(--muted-text-color); font-size: 0.9rem; transition: color var(--transition); }
.footer-col a:hover { color: var(--secondary-color); }
.footer-bottom {
  border-top: 1px solid var(--border-color); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { color: var(--muted-text-color); font-size: 0.85rem; }
.footer-legal { display: flex; gap: 20px; }
.footer-legal a { color: var(--muted-text-color); font-size: 0.85rem; }
.footer-legal a:hover { color: var(--secondary-color); }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed; right: 24px; bottom: 24px; width: 46px; height: 46px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); color: #fff; border: none;
  display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 900; box-shadow: 0 12px 30px -14px rgba(0,0,0,0.5);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------- Reveal-on-scroll ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- 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;
  }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 1024px) {
  .services-grid, .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: 1fr; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .hero-photo-frame { width: min(100%, 260px); margin: 0 auto; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .about-image-wrap { max-width: 380px; margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 780px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed; top: 0; right: 0; height: 100vh; width: min(80%, 320px);
    background: var(--background-color); border-left: 1px solid var(--border-color);
    flex-direction: column; padding: 100px 32px; gap: 26px;
    transform: translateX(100%); transition: transform var(--transition);
    z-index: 999;
  }
  .nav-menu.open { transform: translateX(0); }
  .section { padding: 80px 0; }
  .services-grid, .projects-grid { grid-template-columns: 1fr; }
  .skills-secondary { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero { padding-top: 140px; }
  .hero-stats { gap: 28px; }
}

@media (max-width: 480px) {
  h2 { font-size: 1.7rem; }
  .contact-form { padding: 24px; }
  .about-info-card { padding: 18px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
}