/* =========================================
   RESET & VARIABLES
   ========================================= */
:root {
  /* Light Theme Colors (Default) */
  --bg-base: #FAF9F5;
  --bg-light: #F4F3F1;
  --bg-card: #ffffff;
  --bg-dark: #141413;
  
  --text-main: #141413;
  --text-muted: #666666;
  --text-light: #FAF9F5;
  --text-light-muted: #a1a1aa;
  
  --border-color: #e5e5e5;
  --border-dark: #333333;
  
  --tag-bg: #FAF9F5;
  --tag-bg-accent: #e5e7eb;
  --tag-border: #e5e5e5;
  
  --navbar-bg: rgba(250, 249, 245, 0.95);
  
  --hero-card-bg: #141413;
  --hero-card-text: #FAF9F5;
  --hero-card-muted: #a1a1aa;
  
  /* Typography & Layout */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Playfair Display', serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --container-width: 1200px;
  --section-padding-y: 96px;
  --radius-sm: 4px;
  --radius-lg: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --motion-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --motion-shadow: 0 18px 44px rgba(20, 20, 19, 0.10);
  --border-subtle: rgba(20, 20, 19, 0.10);
  --surface-hover: rgba(20, 20, 19, 0.04);
  --focus-ring: rgba(20, 20, 19, 0.28);
}

/* Dark Theme overrides */
[data-theme="dark"] {
  --bg-base: #121212;
  --bg-light: #181818;
  --bg-card: #1f1f1f;
  --bg-dark: #FAF9F5; /* inverted for contrast */
  
  --text-main: #FAF9F5;
  --text-muted: #a1a1aa;
  --text-light: #141413;
  --text-light-muted: #666666;
  
  --border-color: #333333;
  --border-dark: #e5e5e5;
  
  --tag-bg: #1f1f1f;
  --tag-bg-accent: #333333;
  --tag-border: #333333;
  
  --navbar-bg: rgba(18, 18, 18, 0.95);
  
  --hero-card-bg: #FAF9F5;
  --hero-card-text: #141413;
  --hero-card-muted: #666666;
  --border-subtle: rgba(250, 249, 245, 0.14);
  --surface-hover: rgba(250, 249, 245, 0.06);
  --focus-ring: rgba(250, 249, 245, 0.36);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

body.is-menu-open {
  overflow: hidden;
}

body.is-menu-open .nav-links {
  transition: none;
}

/* =========================================
   TYPOGRAPHY
   ========================================= */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  line-height: 1.2;
}

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

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

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

/* =========================================
   LAYOUT UTILITIES
   ========================================= */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-padding-y) 0;
}

.bg-base { background-color: var(--bg-base); }
.bg-light { background-color: var(--bg-light); }

.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Section Headers */
.section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 48px;
}

.body-text {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 650px;
  margin-bottom: 32px;
}

/* =========================================
   NAVIGATION
   ========================================= */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 24px 0;
  z-index: 100;
  background-color: transparent;
  transition: var(--transition);
}

.navbar.scrolled {
  background-color: var(--navbar-bg);
  backdrop-filter: blur(10px);
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
  z-index: 101; /* Above mobile menu overlay */
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: background-color var(--transition);
  touch-action: manipulation;
}

.theme-toggle-btn:hover {
  background-color: var(--bg-light);
}

.lang-toggle-btn {
  background: none;
  border: none;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
  transition: color var(--transition), background-color var(--transition);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
}

.lang-toggle-btn:hover {
  background-color: var(--bg-light);
}

[data-theme="light"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: none; }

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  will-change: transform;
}

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

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 20px;
  position: relative;
  touch-action: manipulation;
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  position: absolute;
  transition: var(--transition);
}

.mobile-menu-btn span:nth-child(1) { top: 0; }
.mobile-menu-btn span:nth-child(2) { top: 9px; }
.mobile-menu-btn span:nth-child(3) { top: 18px; }

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg);
  top: 9px;
}
.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg);
  top: 9px;
}

/* =========================================
   HERO SECTION
   ========================================= */
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  overflow: hidden;
}

.hero-container {
  display: flex;
  justify-content: center;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  will-change: transform, opacity;
}

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 5rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 32px;
}

.hero-title .highlight {
  font-family: var(--font-sans);
  font-weight: 600;
}

.hero-line {
  display: block;
  will-change: transform, opacity;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  transform-origin: center;
  will-change: transform;
  touch-action: manipulation;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.btn.is-disabled,
.btn:disabled {
  opacity: 0.46;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background-color: var(--text-main);
  color: var(--bg-base);
}

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

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

.btn-secondary:hover {
  background-color: var(--bg-light);
}

.btn-outline-light {
  background-color: transparent;
  border-color: var(--hero-card-text);
  color: var(--hero-card-text);
}

.btn-outline-light:hover {
  background-color: var(--hero-card-text);
  color: var(--hero-card-bg);
}

/* =========================================
   ABOUT SECTION
   ========================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 80px;
}

.subsection-title {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

/* Skills Matrix */
.skills-matrix {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.skills-group {
  will-change: transform, opacity;
}

.skills-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: block;
}

.skill-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.skill-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: help;
  transform-origin: center;
  will-change: transform;
  touch-action: manipulation;
}

.skill-logo:hover {
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}

.svg-logo {
  width: 22px;
  height: 22px;
  transition: filter var(--transition);
}

.brand-logo {
  width: 24px;
  height: 24px;
  object-fit: contain;
  border-radius: 4px;
}

[data-theme="dark"] .svg-logo {
  filter: invert(1) brightness(200%);
}

[data-theme="dark"] .brand-logo {
  filter: none;
}

.inline-svg {
  width: 22px;
  height: 22px;
}

/* Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 0;
  width: 1px;
  background-color: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 32px;
  will-change: transform, opacity;
}

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

.timeline-item:last-child::before {
  display: none;
}

.timeline-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--text-main);
  box-shadow: 0 0 0 4px var(--bg-light);
  transform-origin: center;
}

.timeline-title {
  font-size: 1.125rem;
  margin-bottom: 4px;
}

.timeline-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* =========================================
   PROJECTS SECTION
   ========================================= */
.projects-wrapper {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

/* Featured Card (Dark normally, Light in dark theme) */
.card-featured {
  background-color: var(--hero-card-bg);
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  color: var(--hero-card-text);
  border: 1px solid var(--border-color);
  will-change: transform, opacity;
  transform-style: preserve-3d;
}

.card-content {
  padding: 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--hero-card-muted);
  margin-bottom: 16px;
  display: block;
}

.card-title-display {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: 24px;
  color: var(--hero-card-text);
}

.card-featured .card-text {
  font-size: 1rem;
  color: var(--hero-card-muted);
  margin-bottom: 32px;
  line-height: 1.6;
}

.card-image-wrapper {
  height: 100%;
  min-height: 300px;
  overflow: hidden;
  background-color: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  will-change: transform;
}

/* Standard Cards */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 40px;
}

.card-standard {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition);
  overflow: hidden;
  will-change: transform, opacity;
  transform-style: preserve-3d;
}

.card-standard:hover {
  box-shadow: 0 12px 40px rgba(0,0,0,0.06);
}

[data-theme="dark"] .card-standard:hover {
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.card-standard-image {
  width: 100%;
  height: 240px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card-standard-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  will-change: transform;
}

.card-standard-body {
  padding: 40px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-standard-content {
  flex-grow: 1;
}

.card-standard .card-title {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.card-standard .card-text {
  color: var(--text-muted);
  margin-bottom: 32px;
}

.card-standard-footer {
  margin-top: auto;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  font-weight: 500;
  color: var(--text-main);
  transition: var(--transition);
  will-change: transform;
}

.arrow {
  margin-left: 8px;
  display: inline-block;
  will-change: transform;
}

/* =========================================
   CREDENTIALS
   ========================================= */
.credentials-section {
  scroll-margin-top: 88px;
}

.credentials-header {
  max-width: 760px;
}

.credentials-block {
  margin-top: 56px;
}

.credentials-block--cv {
  max-width: 940px;
}

.credentials-subheader {
  max-width: 760px;
  margin-bottom: 28px;
}

.resume-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.resume-grid--single {
  grid-template-columns: minmax(0, 760px);
}

.resume-card {
  min-width: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  padding: 28px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
  will-change: transform, opacity;
}

.resume-card--simple {
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
  align-items: stretch;
  gap: 28px;
  padding: 18px;
}

.resume-card__preview {
  min-width: 0;
  min-height: 360px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  border-radius: calc(var(--radius-lg) - 8px);
  background-color: var(--bg-light);
}

.resume-card__pdf-preview {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 360px;
  border: 0;
  background-color: var(--bg-card);
}

.resume-card__pdf-preview p {
  padding: 20px;
  color: var(--text-muted);
}

.resume-card__icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background-color: var(--bg-light);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.resume-card__icon svg {
  width: 24px;
  height: 24px;
}

.resume-card__content {
  min-width: 0;
}

.resume-card--simple .resume-card__content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14px 8px 14px 0;
}

.resume-card h3,
.resume-card h4 {
  font-size: 1.35rem;
  margin-bottom: 8px;
  overflow-wrap: anywhere;
}

.resume-card__content > p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

.resume-card__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.resume-card__meta div {
  min-width: 0;
  padding: 10px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: var(--bg-base);
}

.resume-card__meta dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.resume-card__meta dd {
  font-size: 0.9rem;
  color: var(--text-main);
}

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

.resume-card__actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.resume-card--simple .resume-card__actions {
  grid-column: auto;
  margin-top: 8px;
}

.credentials-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.credentials-summary div {
  min-width: 0;
  padding: 18px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.credentials-summary span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.credentials-summary strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-main);
  overflow-wrap: anywhere;
}

.certificate-overview-card {
  max-width: 980px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 0;
  overflow: hidden;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
  will-change: transform, opacity;
}

.certificate-overview-card__image {
  min-width: 0;
  aspect-ratio: 3 / 2;
  background-color: var(--bg-light);
  border-right: 1px solid var(--border-color);
  overflow: hidden;
}

.certificate-overview-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.certificate-overview-card__content {
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px;
}

.certificate-overview-card__content h4 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.certificate-overview-card__content p {
  color: var(--text-muted);
  margin-bottom: 22px;
}

.certificate-overview-card__stats {
  display: grid;
  gap: 10px;
}

.certificate-overview-card__stats div {
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: var(--bg-base);
}

.certificate-overview-card__stats dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.certificate-overview-card__stats dd {
  font-size: 0.92rem;
  color: var(--text-main);
  overflow-wrap: anywhere;
}

.certificate-details {
  margin-top: 24px;
}

.certificate-details[hidden] {
  display: none;
}

.certificate-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.certificate-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.certificate-filter {
  min-height: 44px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-muted);
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  touch-action: manipulation;
}

.certificate-filter.active,
.certificate-filter[aria-pressed="true"] {
  color: var(--bg-base);
  background-color: var(--text-main);
  border-color: var(--text-main);
}

.certificate-count {
  color: var(--text-muted);
  font-size: 0.92rem;
  white-space: nowrap;
}

.certificate-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.certificate-card {
  min-width: 0;
  min-height: auto;
  display: flex;
  flex-direction: column;
  padding: 18px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: calc(var(--radius-lg) - 6px);
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  will-change: transform, opacity;
}

.certificate-card__marker {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-base);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.certificate-card__issuer {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.certificate-card__title {
  font-size: 1.08rem;
  line-height: 1.35;
  margin-bottom: 12px;
  overflow-wrap: anywhere;
}

.certificate-card__category,
.certificate-card__date,
.certificate-card__score {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 8px;
}

.certificate-card__score {
  color: var(--text-main);
  font-weight: 600;
}

.certificate-card__actions {
  margin-top: 12px;
}

.certificate-card__no-preview {
  display: inline-flex;
  color: var(--text-muted);
  font-size: 0.84rem;
}

.credentials-show-more {
  display: flex;
  justify-content: center;
  margin-top: 28px;
}

.credentials-show-more [hidden] {
  display: none;
}

/* =========================================
   DIALOGS
   ========================================= */
.cv-dialog,
.certificate-dialog {
  width: min(1100px, calc(100vw - 32px));
  max-height: 90dvh;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background-color: var(--bg-base);
  color: var(--text-main);
  overflow: hidden;
}

.cv-dialog::backdrop,
.certificate-dialog::backdrop {
  background-color: rgba(20, 20, 19, 0.62);
  backdrop-filter: blur(6px);
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  padding: 22px 24px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-card);
}

.dialog-header h2 {
  font-size: 1.35rem;
  margin-top: 4px;
}

.dialog-kicker,
#certificate-dialog-meta {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.dialog-close {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background-color: var(--bg-base);
  color: var(--text-main);
  font-size: 1.45rem;
  cursor: pointer;
  touch-action: manipulation;
}

.dialog-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-base);
}

.pdf-viewer {
  width: 100%;
  height: 76dvh;
  min-height: 520px;
  border: 0;
  display: block;
  background-color: var(--bg-card);
}

.pdf-viewer p {
  padding: 24px;
  color: var(--text-muted);
}

.certificate-viewer {
  height: 72dvh;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background-color: var(--bg-card);
  overflow: auto;
}

.certificate-viewer img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

@media (pointer: fine) {
  .resume-card:hover,
  .certificate-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--motion-shadow);
  }

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

/* =========================================
   CONTACT & FOOTER
   ========================================= */
.contact-container {
  max-width: 800px;
}

.social-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 32px;
}

.social-btn {
  padding: 12px 24px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: var(--transition);
  transform-origin: center;
  will-change: transform;
  touch-action: manipulation;
}

.social-btn.icon-btn {
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.icon-btn svg {
  width: 22px;
  height: 22px;
  will-change: transform;
}

.social-btn:hover {
  background-color: var(--text-main);
  color: var(--bg-base);
  border-color: var(--text-main);
}

.footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-base);
}

.footer p {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* =========================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================= */

/* Tablet & Mobile */
@media (max-width: 992px) {
  .section-title {
    font-size: 2.35rem;
  }

  .hero-title {
    font-size: 3.8rem;
  }

  .card-title-display {
    font-size: 2.45rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 64px;
  }
  
  .card-featured {
    grid-template-columns: 1fr;
  }
  
  .card-image-wrapper {
    min-height: 250px;
    order: -1;
  }

  .card-content {
    padding: 44px;
  }

  .credentials-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .certificate-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Mobile Devices */
@media (max-width: 768px) {
  .container,
  .nav-content {
    padding-left: 20px;
    padding-right: 20px;
  }

  .section {
    padding: 72px 0;
  }

  .section-title {
    font-size: 2rem;
    margin-bottom: 18px;
  }

  .section-desc {
    font-size: 1rem;
    margin-bottom: 34px;
  }

  .body-text {
    font-size: 1rem;
  }

  .navbar {
    padding: 18px 0;
  }

  .nav-right {
    gap: 12px;
  }

  .nav-controls {
    gap: 6px;
  }

  .theme-toggle-btn,
  .lang-toggle-btn {
    min-width: 38px;
    height: 38px;
  }

  .theme-toggle-btn {
    width: 38px;
  }

  .lang-toggle-btn {
    padding: 7px 10px;
    font-size: 0.8125rem;
  }
  
  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background-color: var(--bg-base);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 96px 24px 48px;
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.45s var(--motion-ease), opacity 0.3s ease, visibility 0.3s ease;
    gap: 40px;
    z-index: 100;
  }
  
  .nav-links.active {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-link {
    font-size: 1.5rem;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    align-items: flex-start;
    padding-top: 112px;
    min-height: auto;
    padding-bottom: 72px;
  }

  .hero-eyebrow {
    font-size: 0.75rem;
    margin-bottom: 18px;
  }

  .hero-title {
    font-size: 2.65rem;
    line-height: 1.12;
    margin-bottom: 24px;
  }

  .hero-desc {
    font-size: 1.0625rem;
    margin-bottom: 32px;
  }

  .about-grid {
    gap: 52px;
  }

  .skills-matrix {
    margin-top: 36px;
    gap: 22px;
  }

  .skill-icons {
    gap: 10px;
  }

  .skill-logo {
    width: 42px;
    height: 42px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .projects-wrapper {
    gap: 28px;
  }

  .card-featured {
    border-radius: 18px;
  }

  .card-content {
    padding: 32px 24px;
  }

  .card-title-display {
    font-size: 2rem;
  }

  .card-image-wrapper {
    min-height: 220px;
    padding: 18px;
  }
  
  .card-standard {
    border-radius: 18px;
  }

  .card-standard-image {
    height: 210px;
    padding: 18px;
  }

  .card-standard-body {
    padding: 32px 24px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
  }

  .social-links {
    gap: 12px;
  }

  .credentials-section {
    scroll-margin-top: 74px;
  }

  .credentials-block {
    margin-top: 44px;
  }

  .resume-grid,
  .certificate-grid,
  .credentials-summary {
    grid-template-columns: 1fr;
  }

  .resume-card {
    grid-template-columns: 1fr;
    padding: 24px;
    border-radius: 18px;
  }

  .resume-card--simple {
    gap: 20px;
  }

  .resume-card--simple .resume-card__content {
    padding: 0;
  }

  .resume-card__preview,
  .resume-card__pdf-preview {
    min-height: 320px;
  }

  .resume-card__icon {
    width: 44px;
    height: 44px;
  }

  .resume-card__meta {
    grid-template-columns: 1fr;
  }

  .resume-card__actions {
    flex-direction: column;
  }

  .resume-card__actions .btn,
  .certificate-card__actions .btn,
  .dialog-actions .btn {
    width: 100%;
  }

  .certificate-overview-card {
    grid-template-columns: 1fr;
    border-radius: 18px;
  }

  .certificate-overview-card__image {
    border-right: 0;
    border-bottom: 1px solid var(--border-color);
  }

  .certificate-overview-card__content {
    padding: 22px;
  }

  .credentials-summary div {
    border-radius: 18px;
  }

  .certificate-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .certificate-count {
    white-space: normal;
  }

  .certificate-card {
    min-height: auto;
    padding: 20px;
    border-radius: 18px;
  }

  .cv-dialog,
  .certificate-dialog {
    width: calc(100vw - 20px);
    max-height: 94dvh;
    border-radius: 18px;
  }

  .dialog-header {
    padding: 18px;
  }

  .dialog-actions {
    padding: 14px 18px;
  }

  .pdf-viewer {
    height: 66dvh;
    min-height: 360px;
  }

  .certificate-viewer {
    height: 64dvh;
    min-height: 320px;
    padding: 14px;
  }
}

@media (max-width: 420px) {
  .container,
  .nav-content {
    padding-left: 16px;
    padding-right: 16px;
  }

  .logo {
    font-size: 1.35rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .btn {
    padding: 13px 20px;
  }

  .card-standard .card-title {
    font-size: 1.3rem;
  }

  .card-standard-image {
    height: 190px;
  }

  .card-image-wrapper {
    min-height: 190px;
  }

  .timeline-item {
    padding-left: 28px;
  }

  .certificate-filter {
    width: 100%;
  }

  .dialog-header {
    gap: 12px;
  }

  .dialog-header h2 {
    font-size: 1.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}