/* 
  Sharath Kumar — Portfolio
  A minimal, classic, editorial portfolio design.
  Clean typography, strong alignment, black/white/gray palette.
*/

:root {
  /* Color Palette - Light Mode Default */
  --bg-primary: #ffffff;
  --bg-secondary: #fcfcfc;
  --bg-subtle: #f5f5f5;
  --text-primary: #111111;
  --text-secondary: #4a4a4a;
  --text-muted: #737373;
  --border-color: #e5e5e5;
  --border-strong: #111111;
  --accent: #111111;
  --accent-text: #ffffff;
  --code-bg: #f4f4f5;

  /* Layout & Spacing */
  --max-width: 760px;
  --header-height: 64px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

html.dark {
  /* Color Palette - Dark Mode */
  --bg-primary: #0d0d0d;
  --bg-secondary: #121212;
  --bg-subtle: #1a1a1a;
  --text-primary: #f2f2f2;
  --text-secondary: #a3a3a3;
  --text-muted: #666666;
  --border-color: #242424;
  --border-strong: #ffffff;
  --accent: #ffffff;
  --accent-text: #000000;
  --code-bg: #18181b;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography Rules */
h1,
h2,
h3,
h4 {
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

p {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

/* Header & Navbar */
.navbar-container {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  width: 100%;
}

.navbar {
  max-width: var(--max-width);
  margin: 0 auto;
  height: var(--header-height);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.nav-brand:hover {
  opacity: 0.8;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle Button */
.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-subtle);
}

html.dark .sun-icon {
  display: block;
}

html.dark .moon-icon {
  display: none;
}

html.light .sun-icon {
  display: none;
}

html.light .moon-icon {
  display: block;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.1rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-sm {
  font-size: 0.85rem;
  padding: 0.4rem 0.85rem;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: var(--text-muted);
}

.btn-copy {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 0.25rem 0.55rem;
  border-radius: 3px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.btn-copy:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

/* Layout Content Wrapper */
.content-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
  flex: 1;
}

/* Section Common */
.section {
  padding: 4.5rem 0;
}

.section-divider {
  height: 1px;
  background-color: var(--border-color);
  width: 100%;
}

.section-heading {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

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

.section-subtitle {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Hero Section */
.hero-section {
  padding: 5.5rem 0 4.5rem 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 7px;
  height: 7px;
  background-color: var(--text-primary);
  border-radius: 50%;
  display: inline-block;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1.18;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  letter-spacing: -0.035em;
  max-width: 620px;
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 620px;
  margin-bottom: 2.25rem;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* About Section */
.about-content {
  max-width: 680px;
}

.about-content p {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Skills Section */
.skills-container {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.skills-inline-list {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.8;
}

.skill-item {
  display: inline-block;
  color: var(--text-primary);
}

.bullet {
  color: var(--text-muted);
  margin: 0 0.4rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 0.5rem;
  padding-top: 1.75rem;
  border-top: 1px dashed var(--border-color);
}

.skill-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.skill-group-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.skill-group-items {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Certifications Section */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.cert-card {
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.cert-card:hover {
  border-color: var(--border-strong);
}

.cert-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background-color: var(--bg-subtle);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  align-self: flex-start;
  margin-bottom: 0.25rem;
}

.cert-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
}

.cert-issuer {
  font-size: 0.825rem;
  color: var(--text-muted);
  font-weight: 500;
}

.cert-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 0.25rem;
}

/* Projects Section */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border-color);
}

.project-item {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: background-color var(--transition-fast);
}

.project-header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.project-title-area {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.project-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.project-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.project-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 680px;
}

.project-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 0.5rem;
}

.project-tech {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tech-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
}

.tech-tags {
  color: var(--text-secondary);
  font-weight: 500;
}

.project-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.link-btn {
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: opacity var(--transition-fast);
  text-decoration: none;
}

.link-btn:hover {
  opacity: 0.7;
}

/* Contact Section */
.contact-intro {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 580px;
}

.contact-card {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

/* Contact Logos Grid */
.contact-logos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-color);
}

.contact-logo-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 135px;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.contact-logo-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  background-color: var(--bg-subtle);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

html.dark .contact-logo-card:hover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.card-logo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.logo-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.contact-logo-card:hover .logo-icon-box {
  border-color: var(--border-strong);
  background-color: var(--bg-primary);
}

.email-logo-box {
  color: var(--text-primary);
}

.linkedin-logo-box {
  color: #0a66c2;
}

.github-logo-box {
  color: var(--text-primary);
}

.btn-copy-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 30px;
  height: 30px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy-icon:hover {
  background-color: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.card-arrow-icon {
  font-size: 1.1rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.contact-logo-card:hover .card-arrow-icon {
  transform: translateX(3px);
  color: var(--text-primary);
}

.card-logo-body {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.card-logo-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.card-logo-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  word-break: break-all;
}

/* Contact Form */
.contact-form-wrapper {
  max-width: 580px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.6rem 0.75rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--border-strong);
}

.form-group textarea {
  resize: vertical;
}

.btn-submit {
  align-self: flex-start;
  margin-top: 0.25rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
  margin-top: 2rem;
  background-color: var(--bg-primary);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.copyright {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 400;
}

.status-indicator {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.dot-green {
  width: 6px;
  height: 6px;
  background-color: #22c55e;
  border-radius: 50%;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  width: 100%;
  max-width: 600px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.modal-lg {
  max-width: 720px;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.modal-header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.modal-body {
  padding: 1.75rem 1.5rem;
}

/* Modal Inner Content Styles */
.modal-project-title {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.modal-project-sub {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-section-title {
  font-size: 0.9rem;
  text-transform: uppercase;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin: 1.25rem 0 0.5rem 0;
}

.modal-section-p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.architecture-box {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  margin: 0.75rem 0;
  white-space: pre-wrap;
  overflow-x: auto;
}

.modal-bullet-list {
  padding-left: 1.2rem;
  margin: 0.5rem 0 1.25rem 0;
}

.modal-bullet-list li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

/* Resume Preview Sheet */
.resume-preview-body {
  background-color: var(--bg-secondary);
  padding: 2rem 1.5rem;
}

.resume-sheet {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 2rem;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.resume-sheet-header h2 {
  font-size: 1.4rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.resume-contact-bar {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.resume-sec h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.35rem;
  margin-bottom: 0.75rem;
}

.resume-sec p {
  font-size: 0.875rem;
  margin-bottom: 0.35rem;
}

.resume-item {
  margin-bottom: 0.75rem;
}

.resume-item-head {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
}

/* Toast Notification */
.toast-notification {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--accent);
  color: var(--accent-text);
  padding: 0.65rem 1.1rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(100px);
  opacity: 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  z-index: 2000;
}

.toast-notification.show {
  transform: translateY(0);
  opacity: 1;
}

/* Responsive Media Queries */
@media (max-width: 768px) {
  .contact-logos-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-link {
    font-size: 0.85rem;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .project-title-area {
    flex-direction: column;
    gap: 0.2rem;
  }

  .project-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .project-links {
    width: 100%;
    justify-content: flex-start;
    gap: 1.5rem;
  }
}