/* ============================================
   Amit Rawat Portfolio — Premium dark UI
   Pure CSS variables, glassmorphism, responsive
   ============================================ */

:root {
  /* Surface & text */
  --bg-deep: #070b12;
  --bg-base: #0c111c;
  --bg-elevated: #121a28;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Accent gradient (cyan / blue) */
  --accent: #22d3ee;
  --accent-2: #3b82f6;
  --accent-soft: rgba(34, 211, 238, 0.12);
  --accent-border: rgba(34, 211, 238, 0.35);
  --gradient: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  --gradient-subtle: linear-gradient(180deg, rgba(34, 211, 238, 0.08) 0%, transparent 50%);

  /* Glass */
  --glass-bg: rgba(15, 23, 42, 0.55);
  --glass-border: rgba(148, 163, 184, 0.12);
  --glass-blur: 16px;

  /* Layout */
  --container: min(1120px, 92vw);
  --radius: 14px;
  --radius-sm: 10px;
  --header-h: 72px;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.35s;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 120% 80% at 50% -30%, rgba(34, 211, 238, 0.15), transparent),
    radial-gradient(ellipse 80% 50% at 100% 50%, rgba(59, 130, 246, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 0% 80%, rgba(34, 211, 238, 0.06), transparent);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* ----- Loader ----- */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-deep);
  transition: opacity 0.5s var(--ease-out), visibility 0.5s;
}

.page-loader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-inner {
  text-align: center;
}

.loader-bar {
  width: 160px;
  height: 3px;
  border-radius: 3px;
  background: var(--bg-elevated);
  overflow: hidden;
  margin: 0 auto 12px;
}

.loader-bar::after {
  content: "";
  display: block;
  height: 100%;
  width: 40%;
  background: var(--gradient);
  border-radius: 3px;
  animation: loader-slide 0.9s ease-in-out infinite;
}

@keyframes loader-slide {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(350%);
  }
}

.loader-text {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ----- Scroll progress ----- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  z-index: 10001;
  background: var(--gradient);
  transform-origin: left;
  transition: width 0.05s linear;
}

/* ----- Particle canvas ----- */
.particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.45;
}

/* ----- Layout ----- */
.container {
  width: var(--container);
  margin-inline: auto;
  padding-inline: 0;
}

.section {
  position: relative;
  z-index: 1;
  padding: clamp(4rem, 10vw, 6rem) 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.35) 0%, transparent 100%);
}

/* ----- Header / Nav ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10000;
  padding: 0 clamp(1rem, 4vw, 2rem);
  background: rgba(7, 11, 18, 0.72);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
}

.navbar {
  max-width: var(--container);
  margin: 0 auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--gradient);
  color: var(--bg-deep);
  font-size: 0.8rem;
  font-weight: 700;
}

.logo-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  display: block;
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--dur) var(--ease-out), background var(--dur) var(--ease-out);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--accent-soft);
}

.nav-link.active {
  color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--dur) var(--ease-out), opacity var(--dur);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -6px;
}

.hamburger::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem clamp(1rem, 4vw, 2rem) 1.5rem;
    background: rgba(7, 11, 18, 0.96);
    border-bottom: 1px solid var(--glass-border);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--dur) var(--ease-out), opacity var(--dur), visibility var(--dur);
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
  }
}

/* ----- Hero ----- */
.hero {
  padding-top: clamp(3rem, 8vw, 5rem);
  padding-bottom: clamp(4rem, 12vw, 7rem);
}

.hero-inner {
  max-width: 720px;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 1rem;
}

.hero-typing {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  min-height: 1.6em;
  margin-bottom: 1rem;
}

.typing-prefix {
  color: var(--text-muted);
}

.typing-text {
  font-weight: 600;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.typing-cursor {
  display: inline-block;
  margin-left: 2px;
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin: 0 0 1rem;
}

.hero-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0 0 2rem;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Fade-in utilities */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s var(--ease-out) forwards;
}

.delay-1 {
  animation-delay: 0.1s;
}
.delay-2 {
  animation-delay: 0.2s;
}
.delay-3 {
  animation-delay: 0.35s;
}
.delay-4 {
  animation-delay: 0.5s;
}
.delay-5 {
  animation-delay: 0.65s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.35rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur) var(--ease-out), box-shadow var(--dur), background var(--dur), border-color var(--dur);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--gradient);
  color: var(--bg-deep);
  box-shadow: 0 4px 24px rgba(34, 211, 238, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 8px 32px rgba(34, 211, 238, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--glass-border);
}

.btn-outline:hover {
  border-color: var(--accent-border);
  background: var(--accent-soft);
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
}

/* ----- Section headers ----- */
.section-header {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 3rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

.section-desc {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1rem;
}

.subsection-head {
  margin-top: clamp(3rem, 8vw, 4.5rem);
}

/* ----- Glass cards ----- */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform var(--dur) var(--ease-out), border-color var(--dur), box-shadow var(--dur);
}

.glass-card:hover {
  border-color: var(--accent-border);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

/* ----- Services ----- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.service-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.service-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ----- Projects ----- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.project-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.project-image {
  aspect-ratio: 16 / 10;
  background: linear-gradient(145deg, rgba(34, 211, 238, 0.15) 0%, rgba(59, 130, 246, 0.1) 50%, var(--bg-elevated) 100%);
  border-bottom: 1px solid var(--glass-border);
  position: relative;
}

.project-image::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 8px,
    rgba(255, 255, 255, 0.02) 8px,
    rgba(255, 255, 255, 0.02) 16px
  );
}

.project-body {
  padding: 1.35rem 1.5rem 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-body h3 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
}

.project-body p {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.tag {
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.2);
}

.project-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ----- Skills ----- */
.skills-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.skill-group-title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 1rem;
}

.skill-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-list li {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 500;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--text-secondary);
  transition: color var(--dur), border-color var(--dur), background var(--dur);
}

.skill-list li:hover {
  color: var(--text-primary);
  border-color: var(--accent-border);
}

/* ----- About ----- */
.about-layout .section-header {
  margin-bottom: 1.5rem;
}

.about-card p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.about-card p:last-child {
  margin-bottom: 0;
}

.about-highlight {
  padding: 1rem 1.25rem;
  border-left: 3px solid transparent;
  border-image: var(--gradient) 1;
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-primary) !important;
}

/* Why hire */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.why-card {
  text-align: left;
}

.why-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.9;
}

.why-card h3 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

.why-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding: clamp(2rem, 5vw, 3rem);
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.stat-value {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

@media (max-width: 600px) {
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

/* ----- Contact ----- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.contact-card {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.35rem;
}

.contact-card:hover {
  transform: translateY(-2px);
}

.contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.contact-value {
  font-size: 0.95rem;
  color: var(--text-secondary);
  word-break: break-all;
}

.contact-card:hover .contact-value {
  color: var(--text-primary);
}

/* ----- Footer ----- */
.site-footer {
  position: relative;
  z-index: 1;
  padding: 2.5rem 0;
  border-top: 1px solid var(--glass-border);
  background: rgba(7, 11, 18, 0.85);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem);
}

.footer-copy {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.social-links {
  display: flex;
  gap: 0.75rem;
}

.social-link {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: color var(--dur), border-color var(--dur), transform var(--dur);
}

.social-link:hover {
  color: var(--accent);
  border-color: var(--accent-border);
  transform: translateY(-2px);
}

/* ----- Back to top ----- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9998;
  width: 48px;
  height: 48px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  color: var(--text-primary);
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  transition: opacity var(--dur), transform var(--dur), border-color var(--dur);
}

.back-to-top:hover {
  border-color: var(--accent-border);
  color: var(--accent);
}

.back-to-top[hidden] {
  display: none;
}

/* ----- Scroll reveal ----- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

/* ----- Focus (keyboard) ----- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.nav-toggle:focus-visible {
  outline-offset: 2px;
}

.btn:focus-visible,
.social-link:focus-visible,
.contact-card:focus-visible {
  outline-offset: 2px;
}