/* =========================================================
   SAMBHAV SUMANG — PORTFOLIO STYLESHEET
   1. Variables  2. Reset  3. Typography  4. Utilities
   5. Loader     6. Ambient BG  7. Navbar   8. Hero
   9. About      10. Skills     11. Projects
   12. Experience 13. Education 14. Certificates
   15. Contact   16. Footer     17. Back to top
   18. Media Queries
   ========================================================= */

/* ============== 1. VARIABLES ============== */
:root {
  /* Surfaces */
  --bg-base: #0a0d16;
  --bg-alt: #0d1220;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-strong: rgba(255, 255, 255, 0.07);
  --border-soft: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);

  /* Accents */
  --accent-indigo: #6366f1;
  --accent-violet: #818cf8;
  --accent-cyan: #22d3ee;
  --accent-emerald: #34d399;
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
  --gradient-text: linear-gradient(135deg, #a5b4fc 0%, #67e8f9 100%);

  /* Text */
  --text-primary: #e9edf5;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Radii */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  /* Shadows */
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-card: 0 20px 45px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 0 1px rgba(99, 102, 241, 0.15), 0 20px 50px rgba(34, 211, 238, 0.08);

  /* Motion */
  --transition-fast: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 700ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Type */
  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  /* Layout */
  --container-width: 1180px;
  --section-spacing: 130px;
}

/* ============== 2. RESET ============== */
* , *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 110px; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font: inherit; color: inherit; }

::selection { background: rgba(99, 102, 241, 0.35); color: #fff; }

@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; }
}

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

/* ============== 3. TYPOGRAPHY ============== */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; color: var(--text-primary); letter-spacing: -0.01em; }

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 14px;
  display: inline-block;
}

.section-title {
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  max-width: 680px;
  margin-bottom: 14px;
}

.section-subtitle {
  color: var(--text-secondary);
  max-width: 560px;
  font-size: 1.02rem;
}

/* ============== 4. UTILITY CLASSES ============== */
.container { width: 100%; max-width: var(--container-width); margin: 0 auto; padding: 0 32px; }
.section { padding: var(--section-spacing) 0; position: relative; }
.section-head { margin-bottom: 56px; }

.glass-card {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
.glass-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

.pill-group { display: flex; flex-wrap: wrap; gap: 10px; }

.pill {
  font-size: 0.85rem;
  padding: 7px 16px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-soft);
  color: var(--text-secondary);
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-base);
  white-space: nowrap;
}
.pill:hover { background: rgba(99, 102, 241, 0.16); color: var(--text-primary); transform: translateY(-2px); }

.pill--tech {
  background: rgba(34, 211, 238, 0.08);
  border-color: rgba(34, 211, 238, 0.2);
  color: #a5f3fc;
}
.pill--tech:hover { background: rgba(34, 211, 238, 0.18); }

.tag-status {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  letter-spacing: 0.04em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: 0.95rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base), opacity var(--transition-base);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-3px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.35);
}
.btn--primary:hover { box-shadow: 0 14px 38px rgba(34, 211, 238, 0.4); }

.btn--secondary {
  background: var(--surface-strong);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
}
.btn--secondary:hover { background: rgba(255, 255, 255, 0.11); }

.btn--outline {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
}
.btn--outline:hover { color: var(--text-primary); border-color: var(--accent-cyan); }

.btn--sm { padding: 10px 20px; font-size: 0.85rem; }
.btn--block { width: 100%; }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; transform: none; }
.btn[disabled]:hover { transform: none; }

/* ============== 5. PAGE LOADER ============== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-base);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
.loader.is-hidden { opacity: 0; visibility: hidden; }

.loader__ring {
  position: absolute;
  width: 74px;
  height: 74px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.08);
  border-top-color: var(--accent-cyan);
  border-right-color: var(--accent-indigo);
  animation: spin 1s linear infinite;
}
.loader__text {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  font-size: 1.1rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============== 6. AMBIENT BACKGROUND ============== */
.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: radial-gradient(ellipse at top, #0d1326 0%, var(--bg-base) 55%);
}
.ambient__grid {
  position: absolute;
  inset: -10%;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 0%, transparent 70%);
}
.ambient__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
}
.ambient__orb--one {
  width: 480px; height: 480px;
  top: -120px; left: -100px;
  background: var(--accent-indigo);
  animation: drift 18s ease-in-out infinite alternate;
}
.ambient__orb--two {
  width: 420px; height: 420px;
  top: 30%; right: -140px;
  background: var(--accent-cyan);
  animation: drift 22s ease-in-out infinite alternate-reverse;
}
.ambient__orb--three {
  width: 380px; height: 380px;
  bottom: -100px; left: 30%;
  background: var(--accent-violet);
  opacity: 0.22;
  animation: drift 26s ease-in-out infinite alternate;
}
@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(40px, 60px) scale(1.08); }
}

/* ============== 7. NAVBAR ============== */
.site-header {
  position: fixed;
  top: 20px;
  left: 0;
  right: 0;
  z-index: 900;
  display: flex;
  justify-content: center;
  padding: 0 20px;
}

.navbar {
  width: 100%;
  max-width: 980px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 26px;
  border-radius: var(--radius-full);
  background: rgba(10, 13, 22, 0.55);
  border: 1px solid var(--border-soft);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-soft);
  transition: background var(--transition-base), box-shadow var(--transition-base), padding var(--transition-base);
}

.site-header.is-scrolled .navbar {
  background: rgba(10, 13, 22, 0.78);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

.navbar__logo {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  letter-spacing: -0.02em;
}
.navbar__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 11px;
  background: var(--gradient-primary);
  color: #08101c;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0;
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.35);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.navbar__logo:hover .navbar__logo-mark {
  transform: rotate(-8deg) scale(1.05);
  box-shadow: 0 8px 22px rgba(34, 211, 238, 0.4);
}
.navbar__logo-text em { color: var(--accent-cyan); font-style: normal; }

.navbar__menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  position: relative;
  font-size: 0.92rem;
  color: var(--text-secondary);
  padding: 6px 2px;
  transition: color var(--transition-base), transform var(--transition-base);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
  border-radius: 2px;
}
.nav-link:hover { color: var(--text-primary); transform: translateY(-2px); }
.nav-link:hover::after { width: 100%; }
.nav-link.active-link { color: var(--text-primary); }
.nav-link.active-link::after { width: 100%; }
.nav-link__icon { display: none; }

.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 34px; height: 34px;
  align-items: center;
  justify-content: center;
}
.navbar__toggle span {
  width: 20px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.navbar__toggle.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__toggle.is-active span:nth-child(2) { opacity: 0; }
.navbar__toggle.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-overlay { display: none; }

/* ============== 8. HERO ============== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 140px;
  padding-bottom: 80px;
  position: relative;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 60px;
}

.hero__name {
  font-size: clamp(2.6rem, 5.4vw, 4.4rem);
  line-height: 1.05;
  background: linear-gradient(135deg, #ffffff 40%, #b9c2e0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 18px;
}

.hero__role {
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2vw, 1.4rem);
  color: var(--accent-cyan);
  margin-bottom: 24px;
  min-height: 1.8em;
}
.cursor { color: var(--accent-violet); animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero__intro {
  color: var(--text-secondary);
  max-width: 540px;
  font-size: 1.02rem;
  margin-bottom: 34px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 34px;
}

.hero__socials { display: flex; gap: 16px; }
.hero__socials a {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  color: var(--text-secondary);
  font-size: 1.05rem;
  transition: all var(--transition-base);
}
.hero__socials a:hover {
  color: #fff;
  transform: translateY(-3px) scale(1.06);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 22px rgba(34, 211, 238, 0.35);
}

.hero__visual { position: relative; display: flex; align-items: center; justify-content: center; }

.hero__ring {
  position: absolute;
  width: 380px; height: 380px;
  border-radius: 50%;
  border: 1px dashed var(--border-strong);
  animation: spin-slow 40s linear infinite;
}
@keyframes spin-slow { to { transform: rotate(360deg); } }

.hero__photo-frame {
  width: 320px; height: 320px;
  border-radius: 50%;
  padding: 6px;
  background: var(--gradient-primary);
  box-shadow: 0 25px 60px rgba(34, 211, 238, 0.22);
  animation: float 8s ease-in-out infinite;
}
.hero__photo {
  width: 100%; height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-base);
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

.floating-chip {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-full);
  background: rgba(10, 13, 22, 0.7);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(14px);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  box-shadow: var(--shadow-soft);
  animation: float 7s ease-in-out infinite;
}
.floating-chip--top { top: 10%; right: 0; animation-delay: 0.4s; color: var(--accent-cyan); }
.floating-chip--bottom { bottom: 12%; left: -6%; animation-delay: 1.2s; color: var(--accent-violet); }

.scroll-cue {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-strong);
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.scroll-cue span {
  width: 4px; height: 8px;
  background: var(--accent-cyan);
  border-radius: 2px;
  animation: scroll-bounce 1.8s ease-in-out infinite;
}
@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(10px); opacity: 0.3; }
}

/* ============== 9. ABOUT ============== */
.about__grid {
  display: grid;
  grid-template-columns: 1.2fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.about__intro p {
  color: var(--text-secondary);
  margin-bottom: 18px;
  font-size: 1.05rem;
  line-height: 1.8;
}
.about__intro strong { color: var(--text-primary); font-weight: 600; }

.about__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.about__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  color: var(--accent-violet);
  transition: transform var(--transition-base), border-color var(--transition-base), background var(--transition-base);
}
.about__tag i { color: var(--accent-cyan); font-size: 0.78rem; }
.about__tag:hover {
  transform: translateY(-2px);
  border-color: rgba(99, 102, 241, 0.5);
  background: rgba(99, 102, 241, 0.16);
}

/* About visual panel — abstract data-orbit graphic */
.about__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 380px;
}
.about__visual-glow {
  position: absolute;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: var(--gradient-primary);
  filter: blur(100px);
  opacity: 0.28;
  z-index: 0;
}

.about__orbit {
  position: relative;
  width: 340px;
  height: 340px;
  z-index: 1;
}
.about__orbit-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px dashed var(--border-strong);
}
.about__orbit-ring--outer {
  animation: spin-slow 26s linear infinite;
}
.about__orbit-ring--inner {
  inset: 46px;
  border-style: solid;
  border-color: var(--border-soft);
  animation: spin-slow 18s linear infinite reverse;
}
@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.about__orbit-core {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 112px; height: 112px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: #08101c;
  font-size: 2.1rem;
  box-shadow: 0 20px 50px rgba(99, 102, 241, 0.4);
  animation: orbit-float 6s ease-in-out infinite;
}
@keyframes orbit-float {
  0%, 100% { transform: translate(-50%, -50%); }
  50% { transform: translate(-50%, calc(-50% - 12px)); }
}

.about__float-chip {
  position: absolute;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-full);
  background: rgba(12, 16, 26, 0.9);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(12px);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-primary);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.4);
  white-space: nowrap;
}
.about__float-chip i { color: var(--accent-cyan); }
.about__float-chip--1 {
  top: 2%; left: 50%;
  animation: float-chip-x 5s ease-in-out infinite;
}
.about__float-chip--2 {
  top: 24%; right: -8%;
  animation: float-chip 5.4s ease-in-out infinite 0.6s;
}
.about__float-chip--3 {
  bottom: 20%; right: -2%;
  animation: float-chip 5.2s ease-in-out infinite 1.2s;
}
.about__float-chip--4 {
  bottom: 0%; left: 50%;
  animation: float-chip-x 5.6s ease-in-out infinite 1.8s;
}
.about__float-chip--5 {
  top: 24%; left: -10%;
  animation: float-chip 5.8s ease-in-out infinite 2.4s;
}
@keyframes float-chip {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes float-chip-x {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-10px); }
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 56px;
  border-radius: var(--radius-lg);
  background: var(--border-soft);
  border: 1px solid var(--border-soft);
  overflow: hidden;
}
.stat-item {
  position: relative;
  text-align: center;
  padding: 32px 18px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base), transform var(--transition-base);
}
.stat-item:hover { background: rgba(99, 102, 241, 0.1); transform: translateY(-2px); }
.stat-item__icon {
  width: 42px; height: 42px;
  margin: 0 auto 14px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--gradient-primary);
  color: #08101c;
  font-size: 1rem;
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.3);
}
.stat-item__value {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 2.2vw, 2.1rem);
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-item__label {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ============== 10. SKILLS ============== */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.skill-card { padding: 32px 34px; transition: transform var(--transition-base), border-color var(--transition-base); }
.skill-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }

.skill-card__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.skill-card__icon {
  width: 48px; height: 48px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--gradient-primary);
  color: #08101c;
  font-size: 1.2rem;
}
.skill-card h3 { font-size: 1.05rem; }

.skill-bars { display: flex; flex-direction: column; gap: 18px; }
.skill-bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 9px;
}
.skill-bar__pct {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
}
.skill-bar__track {
  width: 100%;
  height: 7px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.skill-bar__fill {
  height: 100%;
  width: 0;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.35);
  transition: width 1.1s cubic-bezier(0.16, 1, 0.3, 1);
}
.skill-card .pill-group { margin-top: 2px; }

.tech-cloud {
  margin-top: 40px;
  padding: 30px 34px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border-soft);
  text-align: center;
}
.tech-cloud__label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 18px;
}
.tech-cloud__items {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 12px;
}
.tech-cloud__items span {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-soft);
  background: rgba(255, 255, 255, 0.03);
  transition: color var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}
.tech-cloud__items span:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* ============== 11. PROJECTS ============== */
.project-card {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 0;
  overflow: hidden;
  margin-bottom: 34px;
}
.project-card--reverse { grid-template-columns: 1.15fr 0.85fr; }
.project-card--reverse .project-card__media { order: 2; }
.project-card--reverse .project-card__body { order: 1; }

.project-card__media { overflow: hidden; position: relative; min-height: 260px; }
.project-card__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.project-card:hover .project-card__media img { transform: scale(1.06); }

.project-card__body { padding: 40px; }
.project-card__details {
  display: flex; flex-wrap: wrap; gap: 18px;
  font-size: 0.8rem; color: var(--text-muted);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}
.project-card__details i { color: var(--accent-cyan); margin-right: 5px; }
.project-card__body h3 { font-size: 1.35rem; margin-bottom: 14px; }
.project-card__body > p { color: var(--text-secondary); margin-bottom: 20px; }

.checklist { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; margin-bottom: 22px; }
.checklist li { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; color: var(--text-secondary); }
.checklist i { color: var(--accent-emerald); font-size: 0.8rem; }

.project-card .pill-group { margin-bottom: 26px; }
.project-card__actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* ============== 12. VIRTUAL EXPERIENCE ============== */
.experience-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 32px;
  padding: 40px;
  align-items: flex-start;
}
.experience-card + .experience-card { margin-top: 26px; }
.experience-card__logo {
  width: 96px; height: 96px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  color: #fff;
}
.experience-card__meta { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.experience-card__meta h3 { font-size: 1.3rem; }
.experience-card__body p { color: var(--text-secondary); margin-bottom: 22px; }

/* ============== 13. EDUCATION ============== */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 5px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-indigo), transparent);
}
.timeline__item { position: relative; }
.timeline__dot {
  position: absolute;
  left: -32px; top: 8px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 0 5px rgba(34, 211, 238, 0.18);
}
.timeline__card { padding: 34px 38px; }
.timeline__card h3 { font-size: 1.25rem; margin: 10px 0 12px; }
.timeline__institute { color: var(--accent-cyan); font-size: 0.92rem; margin-bottom: 12px; }
.timeline__card > p:last-child { color: var(--text-secondary); }

/* ============== 14. CERTIFICATES ============== */
.certificates__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.cert-card {
  position: relative;
  padding: 30px;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}
.cert-card--wide { grid-column: span 2; }
.cert-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(160px circle at var(--mx, 50%) var(--my, 0%), rgba(99, 102, 241, 0.16), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-base);
}
.cert-card::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}
.cert-card:hover {
  transform: translateY(-8px) scale(1.015);
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: 0 22px 46px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(99, 102, 241, 0.15);
}
.cert-card:hover::before { opacity: 1; }
.cert-card:hover::after { transform: scaleX(1); }
.cert-card__icon {
  width: 46px; height: 46px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: rgba(34, 211, 238, 0.12);
  color: var(--accent-cyan);
  font-size: 1.15rem;
  margin-bottom: 18px;
  transition: transform var(--transition-base), background var(--transition-base), color var(--transition-base);
}
.cert-card:hover .cert-card__icon {
  transform: rotate(-6deg) scale(1.12);
  background: var(--gradient-primary);
  color: #08101c;
}
.cert-card h3 { font-size: 1.02rem; margin-bottom: 8px; transition: color var(--transition-base); }
.cert-card:hover h3 { color: var(--accent-cyan); }
.cert-card__org { color: var(--text-secondary); font-size: 0.88rem; }

/* ============== 15. CONTACT ============== */
.contact__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
}
.contact__info { display: flex; flex-direction: column; gap: 16px; }
.contact-card {
  display: flex; align-items: center; gap: 18px;
  padding: 20px 24px;
}
.contact-card__icon {
  width: 46px; height: 46px;
  flex-shrink: 0;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--gradient-primary);
  color: #fff;
}
.contact-card h3 { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; margin-bottom: 3px; }
.contact-card p { font-size: 0.98rem; word-break: break-word; }

.contact-form { padding: 40px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.86rem; color: var(--text-secondary); margin-bottom: 8px; }
.form-group input, .form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-soft);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  resize: vertical;
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.14);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-muted); }
.form-error { display: block; min-height: 18px; font-size: 0.78rem; color: #f87171; margin-top: 6px; }

.btn-spinner {
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  display: none;
  animation: spin 0.7s linear infinite;
}
.submitting .btn-label { display: none; }
.submitting .btn-spinner { display: inline-block; }

/* ---- Success Toast: drops down from the top ---- */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  z-index: 1100;
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: min(92vw, 460px);
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(10, 14, 24, 0.92);
  border: 1px solid rgba(52, 211, 153, 0.35);
  backdrop-filter: blur(18px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(52, 211, 153, 0.08);
  transform: translate(-50%, -140%);
  opacity: 0;
  visibility: hidden;
  overflow: hidden;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease, visibility 0.5s;
}
.toast::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-emerald), var(--accent-cyan));
}
.toast::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0;
  height: 2px;
  width: 100%;
  background: rgba(110, 231, 183, 0.5);
  transform-origin: left;
  transform: scaleX(1);
}
.toast.is-visible::after {
  animation: toast-progress 5s linear forwards;
}
@keyframes toast-progress {
  from { transform: scaleX(1); }
  to { transform: scaleX(0); }
}
.toast.is-visible {
  transform: translate(-50%, 0);
  opacity: 1;
  visibility: visible;
}
.toast__icon {
  flex-shrink: 0;
  width: 34px; height: 34px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(52, 211, 153, 0.16);
  color: #6ee7b7;
  font-size: 1.05rem;
}
.toast.is-visible .toast__icon { animation: toast-icon-pop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.15s both; }
@keyframes toast-icon-pop {
  0% { transform: scale(0.4); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}
.toast__text {
  flex: 1;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-primary);
}
.toast__close {
  flex-shrink: 0;
  width: 26px; height: 26px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 0.8rem;
  transition: background var(--transition-base), color var(--transition-base);
}
.toast__close:hover { background: rgba(255, 255, 255, 0.08); color: var(--text-primary); }

/* ============== 16. FOOTER ============== */
.site-footer {
  padding-top: 90px;
  border-top: 1px solid var(--border-soft);
  background: linear-gradient(to bottom, transparent, rgba(99, 102, 241, 0.04));
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 60px;
}
.footer__name { font-family: var(--font-display); font-size: 1.3rem; margin-bottom: 8px; }
.footer__tagline { color: var(--accent-cyan); font-size: 0.88rem; margin-bottom: 16px; }
.footer__note { color: var(--text-muted); font-size: 0.88rem; }
.footer__heading { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 18px; }
.footer__links { display: flex; flex-direction: column; gap: 12px; }
.footer__links a { color: var(--text-secondary); font-size: 0.92rem; transition: color var(--transition-base), transform var(--transition-base); width: fit-content; }
.footer__links a:hover { color: var(--accent-cyan); transform: translateX(4px); }
.footer__social-icons { display: flex; gap: 14px; }
.footer__social-icons a {
  width: 42px; height: 42px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  transition: all var(--transition-base);
}
.footer__social-icons a:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); transform: translateY(-3px); }
.footer__bottom {
  border-top: 1px solid var(--border-soft);
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ============== 17. BACK TO TOP ============== */
.back-to-top {
  position: fixed;
  right: 28px; bottom: 28px;
  width: 50px; height: 50px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-soft);
  opacity: 0; visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  z-index: 500;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); }

/* ============== 18. MEDIA QUERIES ============== */
@media (max-width: 1200px) {
  :root { --section-spacing: 110px; }
}

@media (max-width: 992px) {
  .hero__grid { grid-template-columns: 1fr; text-align: center; }
  .hero__content { order: 2; }
  .hero__visual { order: 1; margin-bottom: 20px; }
  .hero__intro { margin-left: auto; margin-right: auto; }
  .hero__actions, .hero__socials { justify-content: center; }

  .about__grid { grid-template-columns: 1fr; text-align: center; }
  .about__intro { order: 2; }
  .about__intro .about__tags { justify-content: center; }
  .about__visual { order: 1; margin: 0 auto 12px; }
  .about__stats { margin-top: 32px; }

  .project-card, .project-card--reverse { grid-template-columns: 1fr; }
  .project-card__media, .project-card--reverse .project-card__media { order: -1; }
  .project-card--reverse .project-card__body { order: 0; }
  .project-card__media { min-height: 220px; }

  .experience-card { grid-template-columns: 1fr; text-align: left; }

  .contact__grid { grid-template-columns: 1fr; }

  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: span 2; }
}

@media (max-width: 768px) {
  :root { --section-spacing: 90px; }
  .container { padding: 0 22px; }

  .navbar { padding: 12px 18px; }
  .navbar__toggle { display: flex; z-index: 220; }
  body.nav-open { overflow: hidden; }

  .navbar__menu {
    position: fixed;
    top: 0; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    background: linear-gradient(180deg, rgba(13, 17, 28, 0.98), rgba(9, 12, 20, 0.98));
    border: none;
    border-bottom: 1px solid var(--border-strong);
    border-radius: 0 0 32px 32px;
    padding: 100px 22px 36px;
    width: 100%;
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.6);
    transform: translateY(-110%);
    opacity: 0;
    visibility: hidden;
    z-index: 210;
    transition: transform var(--transition-slow), opacity var(--transition-base), visibility var(--transition-slow);
  }
  .navbar__menu::before {
    content: "";
    position: absolute;
    top: 0; left: 20%; right: 20%;
    height: 3px;
    border-radius: 0 0 4px 4px;
    background: var(--gradient-primary);
  }
  .navbar__menu.is-open { transform: translateY(0); opacity: 1; visibility: visible; }

  .navbar__menu li {
    width: 100%;
    opacity: 0;
    transform: translateY(-14px);
    transition: opacity var(--transition-base), transform var(--transition-base);
    transition-delay: 0ms;
  }
  .navbar__menu.is-open li { opacity: 1; transform: translateY(0); }
  .navbar__menu.is-open li:nth-child(1) { transition-delay: 60ms; }
  .navbar__menu.is-open li:nth-child(2) { transition-delay: 100ms; }
  .navbar__menu.is-open li:nth-child(3) { transition-delay: 140ms; }
  .navbar__menu.is-open li:nth-child(4) { transition-delay: 180ms; }
  .navbar__menu.is-open li:nth-child(5) { transition-delay: 220ms; }
  .navbar__menu.is-open li:nth-child(6) { transition-delay: 260ms; }
  .navbar__menu.is-open li:nth-child(7) { transition-delay: 300ms; }
  .navbar__menu.is-open li:nth-child(8) { transition-delay: 340ms; }

  .navbar__menu .nav-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    width: 100%;
    font-size: 1.02rem;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid transparent;
    transition: background var(--transition-base), border-color var(--transition-base), transform var(--transition-base), color var(--transition-base);
  }
  .navbar__menu .nav-link:hover,
  .navbar__menu .nav-link:active {
    background: rgba(99, 102, 241, 0.1);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateX(4px);
  }
  .navbar__menu .nav-link::after { display: none; }
  .navbar__menu .nav-link.active-link {
    color: var(--accent-cyan);
    background: rgba(34, 211, 238, 0.08);
    border-color: rgba(34, 211, 238, 0.3);
  }
  .navbar__menu .nav-link__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px; height: 34px;
    flex-shrink: 0;
    border-radius: 10px;
    background: var(--gradient-primary);
    color: #08101c;
    font-size: 0.85rem;
  }
  .navbar__menu .nav-link.active-link .nav-link__icon {
    background: rgba(34, 211, 238, 0.18);
    color: var(--accent-cyan);
  }

  .nav-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(4, 6, 12, 0.65);
    backdrop-filter: blur(3px);
    opacity: 0;
    visibility: hidden;
    z-index: 200;
    transition: opacity var(--transition-base), visibility var(--transition-base);
  }
  .nav-overlay.is-visible { opacity: 1; visibility: visible; }

  .skills__grid { grid-template-columns: 1fr; }
  .checklist { grid-template-columns: 1fr; }
  .certificates__grid { grid-template-columns: 1fr; }
  .cert-card--wide { grid-column: span 1; }

  .hero__actions { flex-direction: column; width: 100%; }
  .hero__actions .btn { width: 100%; }

  .footer__grid { grid-template-columns: 1fr; text-align: center; }
  .footer__brand { grid-column: span 1; }
  .footer__links, .footer__socials { align-items: center; }
  .footer__links a { margin: 0 auto; }
  .footer__social-icons { justify-content: center; }
}

@media (max-width: 576px) {
  .toast { 
    top: 90px;
    padding: 14px 14px; 
    gap: 10px; 
  }
  .toast__text { font-size: 0.82rem; }

  .skills__grid { grid-template-columns: 1fr; }
  .skill-card { padding: 26px 22px; }
  .tech-cloud { padding: 24px 20px; }
  .hero__photo-frame { width: 240px; height: 240px; }
  .hero__ring { width: 300px; height: 300px; }
  .floating-chip { font-size: 0.75rem; padding: 8px 12px; }
  .section-title { font-size: 1.6rem; }
  .navbar__logo-mark { width: 32px; height: 32px; font-size: 0.75rem; }
  .navbar__logo-text { font-size: 0.98rem; }

  .about__visual { min-height: 260px; }
  .about__orbit { width: 260px; height: 260px; }
  .about__orbit-core { width: 84px; height: 84px; font-size: 1.6rem; }
  .about__visual-glow { width: 230px; height: 230px; }
  .about__float-chip { font-size: 0.72rem; padding: 8px 12px; }
  .about__stats { grid-template-columns: 1fr 1fr; }
}