/* ===================================================
   Geo Nithin J — Portfolio Shared Styles
   Clean, minimal design inspired by index1.html
   =================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  --clr-primary: hsl(210, 99%, 45%);
  --clr-primary-light: hsl(210, 99%, 55%);
  --clr-primary-fg: hsl(0, 0%, 100%);
  --clr-bg: hsl(220, 20%, 97%);
  --clr-surface: hsl(0, 0%, 100%);
  --clr-fg: hsl(0, 0%, 10%);
  --clr-fg-muted: hsl(0, 0%, 45%);
  --clr-border: hsl(0, 0%, 88%);
  --clr-glass: rgba(255, 255, 255, 0.35);
  --clr-glass-border: rgba(255, 255, 255, 0.5);
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ---------- Base ---------- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--clr-bg);
  color: var(--clr-fg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

a {
  color: var(--clr-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--clr-primary-light);
}

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

/* ---------- Background Watermark ---------- */
.bg-watermark {
  position: fixed;
  bottom: -2rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: clamp(6rem, 18vw, 16rem);
  font-weight: 900;
  line-height: 1;
  color: transparent;
  background: linear-gradient(to bottom, rgba(140, 140, 140, 0.08), transparent);
  -webkit-background-clip: text;
  background-clip: text;
  user-select: none;
  pointer-events: none;
  z-index: 0;
}

/* ---------- Main Layout ---------- */
main {
  position: relative;
  z-index: 1;
}

.main-centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem 1.25rem 5rem;
}

.page-main {
  max-width: 48rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.page-wide {
  max-width: 64rem;
}

/* ---------- Hero Section ---------- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
  animation: fadeSlideUp 0.8s ease-out both;
}

.hero__tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 600;
  color: var(--clr-fg);
}

.hero__headline {
  font-size: clamp(2.2rem, 6vw, 3.75rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.hero__subtitle {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--clr-fg-muted);
  max-width: 36rem;
  line-height: 1.6;
}

/* ---------- Page Header (Sub-pages) ---------- */
.page-header {
  text-align: center;
  padding: 6rem 1.25rem 2rem;
  animation: fadeSlideUp 0.8s ease-out both;
}

.page-header__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  border-radius: var(--radius-lg);
  background: rgba(14, 105, 218, 0.1);
  color: var(--clr-primary);
  margin-bottom: 1rem;
}

.page-header__icon svg {
  width: 2rem;
  height: 2rem;
}

.page-header h1 {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

.page-header p {
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--clr-fg-muted);
  max-width: 36rem;
  margin: 0 auto;
}

/* ---------- Avatar ---------- */
.avatar {
  position: relative;
  width: clamp(6rem, 12vw, 9rem);
  height: clamp(6rem, 12vw, 9rem);
  border-radius: 50%;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  animation: fadeScale 0.9s 0.15s ease-out both;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- Ask Bar ---------- */
.ask-bar {
  width: 100%;
  max-width: 32rem;
  margin-top: 1rem;
  animation: fadeSlideDown 0.8s 0.3s ease-out both;
}

.ask-bar__form {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 0.625rem 0.625rem 1.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--clr-border);
  background: var(--clr-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.ask-bar__form:focus-within {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(14, 105, 218, 0.15);
}

.ask-bar__input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 1rem;
  color: var(--clr-fg);
  outline: none;
}

.ask-bar__input::placeholder {
  color: var(--clr-fg-muted);
}

.ask-bar__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  border-radius: 50%;
  background: var(--clr-primary);
  color: var(--clr-primary-fg);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition), transform var(--transition);
}

.ask-bar__btn:hover {
  background: var(--clr-primary-light);
  transform: scale(1.05);
}

.ask-bar__btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.ask-bar__btn svg {
  width: 1.25rem;
  height: 1.25rem;
}

/* ---------- Navigation Grid ---------- */
.nav-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  width: 100%;
  max-width: 48rem;
  animation: fadeSlideDown 0.8s 0.5s ease-out both;
}

.nav-card {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.875rem 1.5rem;
  min-width: 8rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  background: var(--clr-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--clr-fg-muted);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: border-color var(--transition), background var(--transition),
    transform var(--transition), box-shadow var(--transition);
}

.nav-card:hover {
  border-color: var(--clr-primary);
  background: rgba(14, 105, 218, 0.06);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
  color: var(--clr-fg-muted);
}

.nav-card:active {
  transform: scale(0.96);
}

.nav-card svg {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--clr-primary);
  flex-shrink: 0;
}

.nav-card span {
  color: var(--clr-fg);
}

/* ---------- Back Navigation ---------- */
.back-nav {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  background: var(--clr-glass);
  backdrop-filter: blur(12px);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--clr-fg-muted);
  text-decoration: none;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  margin-bottom: 1.5rem;
}

.back-nav:hover {
  border-color: var(--clr-primary);
  background: rgba(14, 105, 218, 0.06);
  color: var(--clr-primary);
  transform: translateX(-2px);
}

.back-nav svg {
  width: 1rem;
  height: 1rem;
}

/* ---------- Sections ---------- */
.section {
  display: none;
  width: 100%;
  max-width: 48rem;
  margin-top: 2.5rem;
  animation: fadeSlideUp 0.5s ease-out both;
}

.section.active {
  display: block;
}

.section__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--clr-fg);
}

/* ---------- Card Component ---------- */
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1rem;
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--clr-fg-muted);
}

.card--flat {
  box-shadow: none;
}

.card--flat:hover {
  box-shadow: var(--shadow-sm);
}

/* ---------- Card Grid ---------- */
.card-grid {
  display: grid;
  gap: 1rem;
}

.card-grid--2 {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.card-grid--3 {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.card-grid--4 {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

/* ---------- Tags ---------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(14, 105, 218, 0.1);
  color: var(--clr-primary);
}

.tag--outline {
  background: transparent;
  border: 1px solid var(--clr-border);
  color: var(--clr-fg-muted);
}

/* ---------- Skill Category ---------- */
.skill-category {
  margin-bottom: 1.5rem;
}

.skill-category:last-child {
  margin-bottom: 0;
}

.skill-category h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--clr-primary);
}

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

.skill-list li {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  color: var(--clr-fg);
  transition: border-color var(--transition), background var(--transition);
}

.skill-list li:hover {
  border-color: var(--clr-primary);
  background: rgba(14, 105, 218, 0.06);
}

/* ---------- Progress Bar ---------- */
.progress-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.progress-row__label {
  min-width: 10rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-fg);
}

.progress-row__pct {
  min-width: 2.5rem;
  text-align: right;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--clr-primary);
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--clr-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: var(--clr-primary);
  border-radius: var(--radius-full);
  transition: width 1.5s ease-out;
}

/* ---------- Contact Info ---------- */
.contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--clr-border);
  font-size: 0.95rem;
}

.contact-item:last-child {
  border-bottom: none;
}

.contact-item strong {
  min-width: 5rem;
  color: var(--clr-fg-muted);
  font-weight: 600;
}

.contact-item a {
  color: var(--clr-primary);
  text-decoration: none;
  transition: color var(--transition);
}

.contact-item a:hover {
  color: var(--clr-primary-light);
  text-decoration: underline;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  color: var(--clr-fg);
  text-decoration: none;
  transition: border-color var(--transition), background var(--transition);
}

.social-links a:hover {
  border-color: var(--clr-primary);
  background: rgba(14, 105, 218, 0.06);
}

/* ---------- Project Images ---------- */
.project-images {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.project-images img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--clr-border);
  transition: transform var(--transition);
}

.project-images img:hover {
  transform: scale(1.03);
}

/* ---------- Project Links ---------- */
.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.project-links a,
.btn {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--clr-primary);
  text-decoration: none;
  padding: 0.45rem 1rem;
  border: 1px solid var(--clr-primary);
  border-radius: var(--radius-full);
  transition: background var(--transition), color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.project-links a:hover,
.btn:hover {
  background: var(--clr-primary);
  color: var(--clr-primary-fg);
}

.btn--solid {
  background: var(--clr-primary);
  color: var(--clr-primary-fg);
  border-color: var(--clr-primary);
}

.btn--solid:hover {
  background: var(--clr-primary-light);
  border-color: var(--clr-primary-light);
}

/* ---------- Resume Section ---------- */
.resume-card {
  text-align: center;
}

.resume-card .download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.75rem 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clr-primary-fg);
  background: var(--clr-primary);
  border: none;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.resume-card .download-btn:hover {
  background: var(--clr-primary-light);
  transform: translateY(-2px);
}

/* ---------- Feature List ---------- */
.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.35rem 0;
  font-size: 0.9rem;
  color: var(--clr-fg-muted);
  line-height: 1.5;
}

.feature-list li svg {
  width: 1rem;
  height: 1rem;
  color: var(--clr-primary);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--clr-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 1.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.65rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--clr-primary);
  border: 2px solid var(--clr-bg);
}

.timeline-item .card {
  margin-bottom: 0;
}

.timeline-date {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--clr-primary);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

/* ---------- Stats Grid ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.stat-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.stat-card__value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--clr-primary);
  margin-bottom: 0.25rem;
}

.stat-card__label {
  font-size: 0.8rem;
  color: var(--clr-fg-muted);
  font-weight: 500;
}

/* ---------- Quote Block ---------- */
.quote-block {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-left: 4px solid var(--clr-primary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--clr-fg-muted);
  font-size: 1rem;
  line-height: 1.7;
}

.quote-block cite {
  display: block;
  margin-top: 0.75rem;
  font-style: normal;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--clr-primary);
}

/* ---------- Book Card ---------- */
.book-card {
  display: flex;
  gap: 1.25rem;
}

.book-card__cover {
  width: 100px;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--clr-border);
  flex-shrink: 0;
}

.book-card__info {
  flex: 1;
}

.book-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.book-card__author {
  font-size: 0.85rem;
  color: var(--clr-fg-muted);
  margin-bottom: 0.5rem;
}

.book-card__rating {
  color: #f59e0b;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

/* ---------- Certificate Card ---------- */
.cert-card {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.cert-card__img {
  width: 100px;
  height: 70px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--clr-border);
  flex-shrink: 0;
}

.cert-card__info {
  flex: 1;
}

.cert-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.cert-card__issuer {
  font-size: 0.8rem;
  color: var(--clr-fg-muted);
}

/* ---------- Status Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.85rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(14, 105, 218, 0.1);
  color: var(--clr-primary);
}

.badge--green {
  background: rgba(34, 197, 94, 0.1);
  color: hsl(142, 71%, 45%);
}

.badge--amber {
  background: rgba(245, 158, 11, 0.1);
  color: hsl(38, 92%, 50%);
}

/* ---------- Icon Box ---------- */
.icon-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  background: rgba(14, 105, 218, 0.1);
  color: var(--clr-primary);
  flex-shrink: 0;
}

.icon-box svg {
  width: 1.25rem;
  height: 1.25rem;
}

/* ---------- Section Divider ---------- */
.divider {
  border: none;
  border-top: 1px solid var(--clr-border);
  margin: 2rem 0;
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 2rem 1.25rem;
  font-size: 0.85rem;
  color: var(--clr-fg-muted);
  border-top: 1px solid var(--clr-border);
  margin-top: 3rem;
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.text-primary { color: var(--clr-primary); }
.text-muted { color: var(--clr-fg-muted); }
.font-bold { font-weight: 700; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* ---------- Animations ---------- */
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeScale {
  from { opacity: 0; transform: scale(0.85); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-up { animation: fadeSlideUp 0.6s ease-out both; }
.animate-down { animation: fadeSlideDown 0.6s ease-out both; }
.animate-scale { animation: fadeScale 0.6s ease-out both; }
.animate-fade { animation: fadeIn 0.6s ease-out both; }

/* Stagger delays */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .nav-grid {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-card {
    justify-content: flex-start;
    min-width: auto;
  }

  .project-images {
    grid-template-columns: 1fr 1fr;
  }

  .card-grid--2,
  .card-grid--3,
  .card-grid--4 {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .book-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .cert-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .progress-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .progress-row__label {
    min-width: auto;
  }

  .progress-bar {
    width: 100%;
  }
}