/* ============================================
   RAHUL KATE — PORTFOLIO
   Clean Light Theme (inspired by adithyask.com)
   ============================================ */

/* --- CSS Variables --- */
:root {
  --bg: #ffffff;
  --bg-alt: #fafafa;
  --bg-card: #ffffff;
  --bg-hover: #f5f5f5;
  --bg-tag: #f0f0f0;
  --bg-tag-active: #1a1a2e;

  --text: #1a1a2e;
  --text-secondary: #555;
  --text-muted: #888;
  --text-light: #aaa;
  --text-tag-active: #fff;

  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eef2ff;

  --border: #e5e5e5;
  --border-light: #f0f0f0;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 50px;

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Fira Code', 'Consolas', monospace;

  --bottom-nav-height: 64px;
  --content-max: 820px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 20px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-bottom: calc(var(--bottom-nav-height) + 16px);
}

::selection {
  background: var(--accent);
  color: #fff;
}

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

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

/* --- Container --- */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-light);
}

.section:last-of-type {
  border-bottom: none;
}

.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: -0.3px;
}

.section-sub {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 28px;
  line-height: 1.6;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero-section {
  padding-top: 60px;
  padding-bottom: 32px;
}

.hero-layout {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
}

.hero-left {
  flex: 1;
}

.hero-name {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.hero-social {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hero-social a {
  color: var(--text-secondary);
  font-size: 1.15rem;
  transition: color 0.2s ease, transform 0.2s ease;
}

.hero-social a:hover {
  color: var(--text);
  transform: translateY(-1px);
}

.resume-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary) !important;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  transition: all 0.2s ease;
}

.resume-link:hover {
  border-color: var(--text);
  color: var(--text) !important;
}

.hero-right {
  flex-shrink: 0;
}

.profile-photo-wrapper {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--border);
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================
   ABOUT
   ============================================ */
.about-content {
  margin-bottom: 20px;
}

.about-content p {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-content p strong {
  color: var(--text);
  font-weight: 600;
}

.more-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  transition: all 0.2s ease;
}

.more-link:hover {
  border-color: var(--text);
  color: var(--text);
  background: var(--bg-hover);
}

.more-link i {
  font-size: 0.85rem;
}

/* ============================================
   SKILLS (Filterable Tags)
   ============================================ */
.skills-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: var(--text);
  color: var(--text);
}

.filter-btn.active {
  background: var(--bg-tag-active);
  color: var(--text-tag-active);
  border-color: var(--bg-tag-active);
}

.filter-count {
  font-size: 0.72rem;
  opacity: 0.7;
  margin-left: 2px;
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
  min-height: 40px;
}

.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: all 0.25s ease;
  cursor: default;
}

.skill-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.skill-chip i {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.skill-chip:hover i {
  color: var(--accent);
}

.skills-count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-light);
  text-align: center;
  margin-top: 8px;
}

/* Skill animation */
.skill-chip.hide {
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  padding: 0;
  margin: 0;
  border: 0;
}

.skill-chip.show {
  opacity: 1;
  transform: scale(1);
}

/* ============================================
   PROJECTS
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.project-card {
  padding: 24px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 0.25s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: #ccc;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.project-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.project-card-title .star-badge {
  color: #f59e0b;
  font-size: 0.8rem;
}

.project-card-desc {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  padding: 3px 10px;
  background: var(--bg-tag);
  border-radius: var(--radius-sm);
}

.section-cta {
  text-align: right;
}

/* ============================================
   EDUCATION
   ============================================ */
.education-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.education-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease;
}

.education-item:hover {
  border-color: #ccc;
}

.edu-institution {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.edu-degree {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.edu-details {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 500px;
}

.edu-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ============================================
   RESUME
   ============================================ */
.resume-box {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 40px;
  align-items: start;
}

.resume-info {
  padding: 32px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-align: center;
}

.resume-info p {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: var(--bg-tag-active);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-download:hover {
  background: #2a2a45;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.resume-note {
  font-size: 0.78rem !important;
  color: var(--text-light) !important;
  margin-top: 12px !important;
  margin-bottom: 0 !important;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 48px;
  bottom: 16px;
  width: 2px;
  background: var(--border);
  border-radius: 2px;
}

.timeline-heading {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 28px;
  padding-left: 0;
  position: relative;
  left: -28px;
}

.timeline-item {
  position: relative;
  margin-bottom: 28px;
  padding-left: 16px;
}

.timeline-dot {
  position: absolute;
  left: -25px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-tag-active);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--border);
}

.timeline-body {
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease;
}

.timeline-body:hover {
  border-color: #ccc;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
  display: block;
  margin-bottom: 4px;
}

.timeline-body h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.timeline-body p {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   CONTACT
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.contact-item:hover {
  border-color: #ccc;
  background: var(--bg-hover);
}

.contact-item > i {
  font-size: 1.2rem;
  color: var(--text-muted);
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.contact-item strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.contact-item span {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: 32px 24px;
  text-align: center;
  border-top: 1px solid var(--border-light);
}

.footer p {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer strong {
  color: var(--text);
}

/* ============================================
   BOTTOM NAVIGATION BAR
   ============================================ */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0;
  z-index: 1000;
  padding: 0 8px;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 8px 16px;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.2s ease;
  text-decoration: none;
  font-family: var(--font-main);
  min-width: 60px;
}

.bottom-nav-item i {
  font-size: 1.1rem;
}

.bottom-nav-item:hover,
.bottom-nav-item.active {
  color: var(--text);
}

.bottom-nav-item.active {
  font-weight: 600;
}

/* ============================================
   MENU OVERLAY
   ============================================ */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(20px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.menu-overlay.open {
  opacity: 1;
  visibility: visible;
}

.menu-overlay-content {
  text-align: center;
}

.menu-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text);
  cursor: pointer;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s ease;
}

.menu-close:hover {
  background: var(--bg-hover);
}

.menu-overlay-nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.menu-overlay-nav a {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text);
  padding: 8px 24px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.menu-overlay-nav a:hover {
  background: var(--bg-hover);
  color: var(--accent);
}

.menu-overlay-social {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.menu-overlay-social a {
  font-size: 1.3rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.menu-overlay-social a:hover {
  color: var(--text);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .hero-layout {
    flex-direction: column-reverse;
    align-items: center;
    text-align: center;
    gap: 24px;
  }

  .hero-social {
    justify-content: center;
  }

  .hero-name {
    font-size: 1.6rem;
  }

  .profile-photo-wrapper {
    width: 110px;
    height: 110px;
  }

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

  .resume-box {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .education-item {
    flex-direction: column;
    gap: 8px;
  }

  .section-heading {
    font-size: 1.3rem;
  }

  .bottom-nav-item {
    padding: 8px 10px;
    min-width: 48px;
    font-size: 0.65rem;
  }

  .bottom-nav-item i {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section {
    padding: 36px 0;
  }

  .hero-name {
    font-size: 1.4rem;
  }

  .skills-filter {
    gap: 6px;
  }

  .filter-btn {
    padding: 5px 12px;
    font-size: 0.75rem;
  }
}