/* ============================================
   Abhimanue R — Portfolio Custom Styles
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --color-bg: #0a0a0a;
  --color-bg-lighter: #111111;
  --color-card: #141414;
  --color-border: #1f1f1f;
  --color-accent: #06b6d4;
  --color-accent-light: #22d3ee;
  --color-accent-glow: rgba(6, 182, 212, 0.35);
  --color-text: #e5e7eb;
  --color-text-muted: #9ca3af;
  --font-primary: 'Poppins', sans-serif;
  --transition: 0.3s ease;
  --radius: 0.75rem;
  --radius-lg: 1rem;
  --grid-line: rgba(255, 255, 255, 0.035);
  --grid-size: 40px;
}

@media (min-width: 640px) {
  :root {
    --grid-size: 56px;
  }
}

@media (min-width: 1024px) {
  :root {
    --grid-size: 72px;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  font-family: var(--font-primary);
}

::selection {
  background-color: var(--color-accent);
  color: #000;
}

/* ---------- Full-Page Grid Background ---------- */
.geo-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-color: var(--color-bg);
  background-image:
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  background-position: center top;
}

/* Legacy shape elements — grid is rendered on .geo-bg via CSS only */
.geo-grid,
.geo-shapes {
  display: none;
}

/* ---------- Navbar ---------- */
#navbar {
  background: transparent;
}

#navbar.scrolled {
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.nav-logo:hover {
  color: var(--color-accent-light);
}

.nav-link {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: 0.5rem;
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
  background: rgba(6, 182, 212, 0.08);
}

/* Hamburger */
.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

#menu-toggle.open .hamburger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

#menu-toggle.open .hamburger-line:nth-child(2) {
  opacity: 0;
}

#menu-toggle.open .hamburger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  max-height: 0;
  overflow: hidden;
  background: rgba(10, 10, 10, 0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: max-height 0.4s ease, border-color var(--transition);
}

.mobile-menu.open {
  max-height: 500px;
  border-bottom-color: var(--color-border);
}

.mobile-nav-link {
  display: block;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: 0.5rem;
  transition: color var(--transition), background var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--color-accent);
  background: rgba(6, 182, 212, 0.08);
}

/* ---------- Section Utilities ---------- */
.section-padding {
  padding: 1.5rem 0;
}

@media (min-width: 640px) {
  .section-padding {
    padding: 2.75rem 0;
  }
}

@media (min-width: 1024px) {
  .section-padding {
    padding: 3.5rem 0;
  }
}

.section-header {
  text-align: center;
  margin-bottom: 2rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: #fff;
}

@media (min-width: 640px) {
  .section-title {
    font-size: 2.25rem;
  }
}

/* ---------- Buttons ---------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: #000;
  background: var(--color-accent);
  border-radius: var(--radius);
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  box-shadow: 0 0 20px var(--color-accent-glow);
}

.btn-primary:hover {
  background: var(--color-accent-light);
  box-shadow: 0 0 30px var(--color-accent-glow);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

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

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  background: transparent;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-outline:hover {
  background: rgba(6, 182, 212, 0.1);
  transform: translateY(-2px);
}

/* ---------- Social Icons ---------- */
.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  font-size: 1.125rem;
  color: var(--color-text-muted);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  transition: color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.social-icon:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 15px var(--color-accent-glow);
  transform: translateY(-3px);
}

/* ---------- Hero ---------- */
.hero-section {
  position: relative;
}

.glow-text {
  text-shadow: 0 0 30px var(--color-accent-glow);
}

.profile-frame {
  position: relative;
  width: 220px;
  height: 220px;
}

@media (min-width: 640px) {
  .profile-frame {
    width: 280px;
    height: 280px;
  }
}

@media (min-width: 1024px) {
  .profile-frame {
    width: 340px;
    height: 340px;
  }
}

.profile-glow {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), transparent, var(--color-accent-light));
  opacity: 0.6;
  animation: glow-pulse 3s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

.profile-image {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--color-bg);
  z-index: 1;
}

/* ---------- About Info Cards ---------- */
.info-card {
  display: flex;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.info-card:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.08);
}

.info-card i {
  font-size: 1.125rem;
  margin-top: 0.125rem;
  flex-shrink: 0;
}

.info-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.info-value {
  font-size: 0.9375rem;
  color: var(--color-text);
}

/* ---------- Skills ---------- */
.skill-card {
  padding: 1.5rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.skill-card:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 8px 30px rgba(6, 182, 212, 0.1);
  transform: translateY(-4px);
}

.skill-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.skill-card-header i {
  font-size: 1.25rem;
  color: var(--color-accent);
}

.skill-card-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}

.skill-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-badge {
  display: inline-block;
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: rgba(6, 182, 212, 0.06);
  border: 1px solid rgba(6, 182, 212, 0.15);
  border-radius: 9999px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.skill-badge:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(6, 182, 212, 0.12);
}

/* ---------- Skills (Vertical Rows) ---------- */
.skills-scroll {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  overflow: visible;
  padding: 0;
}

.skills-scroll .skill-card {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  padding: 1.5rem;
}

/* Left side: icon + category */
.skills-scroll .skill-card-header {
  flex: 0 0 240px;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Right side: skills */
.skills-scroll .skill-badges {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Mobile */
@media (max-width: 767px) {
  .skills-scroll .skill-card {
    flex-direction: column;
    gap: 1rem;
  }

  .skills-scroll .skill-card-header {
    flex: none;
    width: 100%;
  }
}

/* ---------- Subsection Title (Education/Languages/Certs) ---------- */
.subsection-title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

/* ---------- Language Cards ---------- */
.lang-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.875rem 1rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.lang-card:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.08);
}

.lang-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
}

.lang-level {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

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

@media (min-width: 640px) {
  .timeline {
    padding-left: 2.5rem;
  }
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0.4375rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}

@media (min-width: 640px) {
  .timeline::before {
    left: 0.5625rem;
  }
}

.timeline-item {
  position: relative;
  padding-bottom: 1.75rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 0.375rem;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--color-accent-glow);
  z-index: 1;
}

@media (min-width: 640px) {
  .timeline-dot {
    left: -2.5rem;
    width: 16px;
    height: 16px;
  }
}

.timeline-content {
  padding: 1.25rem 1.5rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.timeline-content:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.08);
}

.timeline-date {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.03em;
  margin-bottom: 0.5rem;
}

.timeline-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.25rem;
}

@media (min-width: 640px) {
  .timeline-title {
    font-size: 1.125rem;
  }
}

.timeline-company {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.timeline-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.timeline-list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 0.5rem;
}

.timeline-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  opacity: 0.6;
}

.timeline-list li:last-child {
  margin-bottom: 0;
}

/* ---------- Projects ---------- */
.project-card {
  position: relative;
  padding: 1.75rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: rgba(6, 182, 212, 0.35);
  box-shadow: 0 8px 40px rgba(6, 182, 212, 0.12);
  transform: translateY(-6px);
}

.project-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  font-size: 1.25rem;
  color: var(--color-accent);
  background: rgba(6, 182, 212, 0.1);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.project-year {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.project-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.project-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.project-features {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
  flex-grow: 1;
}

.project-features li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0.375rem;
}

.project-features li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: auto;
}

.project-stack span {
  padding: 0.25rem 0.625rem;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ---------- Education ---------- */
.edu-card {
  display: flex;
  gap: 1.25rem;
  padding: 1.75rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.edu-card:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.08);
}

.edu-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  font-size: 1.5rem;
  color: var(--color-accent);
  background: rgba(6, 182, 212, 0.1);
  border-radius: var(--radius);
  flex-shrink: 0;
}

.edu-date {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.375rem;
}

.edu-degree {
  font-size: 1.125rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.25rem;
}

.edu-institution {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.edu-details {
  list-style: none;
  padding: 0;
  margin: 0;
}

.edu-details li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0.375rem;
}

.edu-details li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* ---------- Certifications ---------- */
.cert-badge {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.cert-badge:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.08);
}

.cert-badge i {
  font-size: 1.25rem;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.cert-badge p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- Contact Form ---------- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-primary);
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #555;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.contact-detail {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-detail i {
  font-size: 1.25rem;
  color: var(--color-accent);
  margin-top: 0.125rem;
}

.contact-detail-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.contact-detail a {
  color: var(--color-text);
  transition: color var(--transition);
}

.contact-detail a:hover {
  color: var(--color-accent);
}

.contact-detail p {
  color: var(--color-text);
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer-social {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  font-size: 1rem;
  color: var(--color-text-muted);
  transition: color var(--transition), transform var(--transition);
}

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

.back-to-top {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  font-size: 0.875rem;
  color: var(--color-accent);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 50%;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  color: #000;
  box-shadow: 0 0 20px var(--color-accent-glow);
  transform: translateY(-3px);
}

/* ---------- Accessibility: Reduced Motion ---------- */
@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;
  }

  .profile-glow {
    animation: none;
  }
}