/* ── Modern motion & polish layer ─────────────────────────── */
:root {
  --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out-soft: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-spring: cubic-bezier(0.34, 1.45, 0.64, 1);
  --duration-fast: 0.22s;
  --duration-normal: 0.45s;
  --duration-slow: 0.65s;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --border-subtle: rgba(102, 126, 234, 0.12);
  --shadow-soft: 0 8px 32px rgba(15, 23, 42, 0.06);
  --shadow-lift: 0 20px 48px rgba(102, 126, 234, 0.14);
}

@media (prefers-reduced-motion: no-preference) {
  html:not(.reduce-effects) {
    scroll-behavior: smooth;
  }
}

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

#particle-canvas {
  opacity: 0.55;
  transition: opacity 0.6s var(--ease-smooth);
}

body.dark-mode #particle-canvas {
  opacity: 0.35;
}

/* Scroll progress */
#progress-bar {
  height: 3px;
  transition: width 0.15s var(--ease-out-soft);
  box-shadow: 0 0 20px rgba(167, 139, 250, 0.55);
}

/* Header glass */
header {
  transition:
    background 0.4s var(--ease-smooth),
    box-shadow 0.4s var(--ease-smooth),
    border-color 0.4s var(--ease-smooth);
}

header.scrolled {
  box-shadow: 0 8px 32px rgba(15, 23, 42, 0.08);
}

.main-nav li a,
.nav-dropdown-btn {
  transition:
    background var(--duration-fast) var(--ease-smooth),
    color var(--duration-fast) var(--ease-smooth),
    transform var(--duration-fast) var(--ease-smooth);
}

.main-nav li a:active,
.nav-dropdown-btn:active {
  transform: scale(0.97);
}

.nav-cta,
.nav-resume,
.dark-toggle {
  transition:
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-normal) var(--ease-smooth),
    background var(--duration-fast) var(--ease-smooth);
}

.nav-cta:active,
.nav-resume:active {
  transform: translateY(0) scale(0.98);
}

/* Hero */
.hero-inner {
  perspective: 1200px;
}

.hero-right {
  animation: heroEnter var(--duration-slow) var(--ease-smooth) 0.15s both;
}

@keyframes heroEnter {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.hero-tagline {
  background: linear-gradient(90deg, #c4b5fd, #e9d5ff, #c4b5fd);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: textShine 6s linear infinite;
}

@keyframes textShine {
  to {
    background-position: 200% center;
  }
}

.tech-badge,
.stat-card {
  transition:
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-normal) var(--ease-smooth),
    border-color var(--duration-fast) var(--ease-smooth);
}

.tech-badge:hover,
.stat-card:hover {
  transform: translateY(-3px);
}

.hero-actions .btn-main,
.hero-actions .btn-secondary {
  transition:
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-normal) var(--ease-smooth),
    background var(--duration-fast) var(--ease-smooth),
    border-color var(--duration-fast) var(--ease-smooth);
}

.social-icon {
  transition:
    transform var(--duration-fast) var(--ease-spring),
    background var(--duration-fast) var(--ease-smooth),
    color var(--duration-fast) var(--ease-smooth);
}

.social-icon:hover {
  transform: translateY(-3px) scale(1.05);
}

/* Content cards */
.card {
  transition:
    transform var(--duration-normal) var(--ease-smooth),
    box-shadow var(--duration-normal) var(--ease-smooth),
    border-color var(--duration-normal) var(--ease-smooth);
  border: 1px solid var(--border-subtle);
}

@media (hover: hover) and (min-width: 1025px) {
  .card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lift);
  }
}

.section-label {
  letter-spacing: 0.14em;
  transition: color var(--duration-fast) var(--ease-smooth);
}

/* Scroll reveal — disabled when .perf-mode (see performance.css) */
.reveal-item {
  opacity: 1;
  transform: none;
}

.reveal-item.is-visible {
  opacity: 1;
  transform: none;
}

/* Project cards */
.project-card {
  transition:
    transform var(--duration-normal) var(--ease-smooth),
    box-shadow var(--duration-normal) var(--ease-smooth),
    border-color var(--duration-normal) var(--ease-smooth);
}

.project-card:hover {
  transform: translateY(-4px);
}

.project-card--hero:hover {
  transform: translateY(-4px);
}

.project-image-wrapper img {
  transition: transform 0.35s var(--ease-smooth);
}

@media (hover: hover) {
  .project-card:hover .project-image-wrapper img {
    transform: scale(1.04);
  }
}

.project-overlay {
  transition: opacity var(--duration-normal) var(--ease-smooth);
  backdrop-filter: blur(2px);
}

.overlay-cta {
  transition:
    transform var(--duration-normal) var(--ease-spring),
    opacity var(--duration-normal) var(--ease-smooth);
}

.project-card:hover .overlay-cta {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.skill-tag,
.tech-badge {
  transition:
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-fast) var(--ease-smooth);
}

.skill-tag:hover {
  transform: translateY(-2px);
}

.testimonial-card,
.client-card,
.github-card,
.cert-card {
  transition:
    transform var(--duration-normal) var(--ease-smooth),
    box-shadow var(--duration-normal) var(--ease-smooth),
    border-color var(--duration-fast) var(--ease-smooth);
}

.timeline-item {
  transition: opacity var(--duration-slow) var(--ease-smooth);
}

.faq-item {
  transition:
    border-color var(--duration-fast) var(--ease-smooth),
    box-shadow var(--duration-fast) var(--ease-smooth);
}

.faq-item[open] {
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.08);
}

.contact-link,
.platform-cta {
  transition:
    color var(--duration-fast) var(--ease-smooth),
    transform var(--duration-fast) var(--ease-smooth);
}

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

.arch-step {
  transition:
    transform var(--duration-normal) var(--ease-smooth),
    box-shadow var(--duration-normal) var(--ease-smooth);
}

.arch-step:hover {
  transform: translateY(-2px);
}

.scroll-to-top {
  transition:
    opacity var(--duration-fast) var(--ease-smooth),
    visibility var(--duration-fast) var(--ease-smooth),
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-normal) var(--ease-smooth);
}

.scroll-to-top.is-visible:hover {
  transform: translateY(-4px) scale(1.05);
}

/* Form focus */
#contact-form input,
#contact-form textarea {
  transition:
    border-color var(--duration-fast) var(--ease-smooth),
    box-shadow var(--duration-fast) var(--ease-smooth),
    transform var(--duration-fast) var(--ease-smooth);
}

#contact-form input:focus,
#contact-form textarea:focus {
  transform: translateY(-1px);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.18);
}

#contact-form button {
  transition:
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-normal) var(--ease-smooth);
}

#contact-form button:hover {
  transform: translateY(-2px);
}

#contact-form button:active {
  transform: translateY(0) scale(0.98);
}

body.dark-mode .card {
  border-color: rgba(102, 126, 234, 0.15);
}

body.dark-mode .card:hover {
  box-shadow: 0 20px 48px rgba(102, 126, 234, 0.12);
}

.fade-in {
  transition: opacity 0.4s var(--ease-smooth);
}

.fade-out {
  transition: opacity 0.28s var(--ease-out-soft);
}

.blog-grid {
  gap: 1.35rem;
}

.section-header h2 {
  letter-spacing: -0.02em;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal-item {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero-right,
  .hero-tagline {
    animation: none;
    -webkit-text-fill-color: #c4b5fd;
  }

  .card:hover,
  .project-card:hover {
    transform: none;
  }
}