/* ============================================
   Shivam Kumar Verma — Portfolio Styles
   ============================================ */

:root {
  --color-bg: #0c0f0d;
  --color-bg-elevated: #141a16;
  --color-bg-card: #1a221c;
  --color-surface: #222b24;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #e8ebe9;
  --color-text-muted: #8a9a8e;
  --color-primary: #4ade80;
  --color-primary-dim: #22c55e;
  --color-accent: #fbbf24;
  --color-accent-warm: #d97706;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --font-display: 'Fraunces', Georgia, serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-glow: 0 0 60px rgba(74, 222, 128, 0.12);
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 72px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: min(1140px, 92vw);
  margin-inline: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* Cursor glow */
.cursor-glow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74, 222, 128, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s;
}

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}

.nav--scrolled {
  background: rgba(12, 15, 13, 0.85);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  z-index: 10;
}

.nav__logo-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dim));
  color: var(--color-bg);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.nav__logo-text {
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 10;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
  border-radius: 2px;
}

.nav__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav__links a {
  padding: 8px 16px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav__links a:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.05);
}

.nav__cta {
  background: var(--color-primary) !important;
  color: var(--color-bg) !important;
  font-weight: 600 !important;
}

.nav__cta:hover {
  background: var(--color-primary-dim) !important;
  color: var(--color-bg) !important;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dim));
  color: var(--color-bg);
  box-shadow: 0 4px 24px rgba(74, 222, 128, 0.25);
}

.btn--primary:hover {
  box-shadow: 0 8px 32px rgba(74, 222, 128, 0.35);
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn--full {
  width: 100%;
  justify-content: center;
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 40px) 0 80px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: float 8s ease-in-out infinite;
}

.hero__orb--1 {
  width: 500px;
  height: 500px;
  background: rgba(74, 222, 128, 0.15);
  top: -10%;
  right: -10%;
}

.hero__orb--2 {
  width: 400px;
  height: 400px;
  background: rgba(251, 191, 36, 0.08);
  bottom: 10%;
  left: -5%;
  animation-delay: -4s;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(20px, -20px) scale(1.05); }
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.2);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero__title {
  margin-bottom: 16px;
}

.hero__greeting {
  display: block;
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: 8px;
}

.hero__name {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 600;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 20px;
  min-height: 1.5em;
}

.typed-cursor {
  animation: blink 1s step-end infinite;
  color: var(--color-primary);
}

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

.hero__desc {
  max-width: 560px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 36px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 56px;
}

.hero__stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.hero__stat-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.hero__stat-suffix {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-primary);
}

.hero__stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ========== Sections ========== */
.section {
  padding: 100px 0;
  position: relative;
}

.section__header {
  margin-bottom: 56px;
}

.section__tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 600;
  line-height: 1.2;
}

/* ========== Reveal animations ========== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ========== About ========== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
  align-items: center;
}

.about__image-frame {
  position: relative;
  width: 280px;
  margin: 0 auto;
}

.about__avatar {
  width: 280px;
  height: 320px;
  background: linear-gradient(145deg, var(--color-bg-card), var(--color-surface));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  position: relative;
  z-index: 1;
  overflow: hidden;
}

.about__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 15%;
  display: block;
}

.about__avatar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(74, 222, 128, 0.1), transparent 60%);
}

.about__image-accent {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  top: 16px;
  left: 16px;
  z-index: 0;
  opacity: 0.4;
}

.about__location {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.about__text {
  color: var(--color-text-muted);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.about__highlights {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 32px;
}

.about__highlight {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), transform var(--transition);
}

.about__highlight:hover {
  border-color: rgba(74, 222, 128, 0.3);
  transform: translateX(8px);
}

.about__highlight-icon {
  font-size: 1.5rem;
}

.about__highlight strong {
  display: block;
  font-size: 0.95rem;
}

.about__highlight span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ========== Skills ========== */
.skills {
  background: var(--color-bg-elevated);
}

.skills__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-card {
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.skill-card:hover {
  transform: translateY(-6px);
  border-color: rgba(74, 222, 128, 0.25);
  box-shadow: var(--shadow-glow);
}

.skill-card__icon {
  width: 48px;
  height: 48px;
  padding: 12px;
  background: rgba(74, 222, 128, 0.1);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  margin-bottom: 20px;
}

.skill-card__icon svg {
  width: 100%;
  height: 100%;
}

.skill-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
}

.skill-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.skill-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.skill-card__tags span {
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.skill-card__bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
}

.skill-card__fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 4px;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-card__fill.animated {
  width: var(--fill-width);
}

/* ========== Education Timeline ========== */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent), transparent);
}

.timeline__item {
  position: relative;
  padding-bottom: 40px;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__marker {
  position: absolute;
  left: -32px;
  top: 8px;
  width: 16px;
  height: 16px;
  background: var(--color-bg);
  border: 3px solid var(--color-primary);
  border-radius: 50%;
  z-index: 1;
  transition: background var(--transition), transform var(--transition);
}

.timeline__item:hover .timeline__marker {
  background: var(--color-primary);
  transform: scale(1.2);
}

.timeline__card {
  padding: 28px 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), transform var(--transition);
}

.timeline__item:hover .timeline__card {
  border-color: rgba(74, 222, 128, 0.2);
  transform: translateX(8px);
}

.timeline__year {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.timeline__card h3 {
  font-size: 1.2rem;
  margin-bottom: 6px;
}

.timeline__institution {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 14px;
}

.timeline__meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.timeline__badge {
  padding: 4px 12px;
  background: rgba(74, 222, 128, 0.1);
  color: var(--color-primary);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
}

.timeline__badge--gold {
  background: rgba(251, 191, 36, 0.1);
  color: var(--color-accent);
}

.timeline__desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ========== Experience ========== */
.experience {
  background: var(--color-bg-elevated);
}

.experience__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.exp-card {
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.exp-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}

.exp-card:hover {
  transform: translateY(-6px);
  border-color: rgba(74, 222, 128, 0.2);
}

.exp-card:hover::before {
  transform: scaleX(1);
}

.exp-card__period {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.exp-card h3 {
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.exp-card__org {
  color: var(--color-accent);
  font-size: 0.85rem;
  margin-bottom: 14px;
}

.exp-card p:last-child {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ========== Projects ========== */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow);
}

.project-card__visual {
  height: 160px;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
}

.project-card__visual span {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 700;
  opacity: 0.15;
}

.project-card__visual--1 {
  background: linear-gradient(135deg, #14532d, #166534);
}

.project-card__visual--2 {
  background: linear-gradient(135deg, #713f12, #a16207);
}

.project-card__visual--3 {
  background: linear-gradient(135deg, #1e3a5f, #1e40af);
}

.project-card__body {
  padding: 28px;
}

.project-card__body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.project-card__body p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-card__tags span {
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ========== Contact ========== */
.contact {
  background: var(--color-bg-elevated);
}

.contact__wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
  padding: 56px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.contact__info p {
  color: var(--color-text-muted);
  margin: 16px 0 32px;
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact__link {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

a.contact__link:hover {
  color: var(--color-primary);
}

.contact__link-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: rgba(74, 222, 128, 0.08);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact__link-icon svg {
  width: 20px;
  height: 20px;
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-success {
  text-align: center;
  color: var(--color-primary);
  font-size: 0.9rem;
  padding: 12px;
  background: rgba(74, 222, 128, 0.1);
  border-radius: var(--radius-sm);
}

/* ========== Footer ========== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer__top {
  transition: color var(--transition);
}

.footer__top:hover {
  color: var(--color-primary);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .experience__grid,
  .projects__grid {
    grid-template-columns: 1fr;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .contact__wrapper {
    grid-template-columns: 1fr;
    padding: 40px;
  }
}

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

  .nav__links {
    position: fixed;
    inset: 0;
    background: rgba(12, 15, 13, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
  }

  .nav__links.open {
    opacity: 1;
    visibility: visible;
  }

  .nav__links a {
    font-size: 1.2rem;
    padding: 12px 24px;
  }

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

  .hero__stats {
    gap: 32px;
  }

  .section {
    padding: 72px 0;
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .contact__wrapper {
    padding: 28px;
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
  }
}