/* ============================================
   AJITH KUMAR M — Portfolio Design System
   Premium Light Theme | Blue + Red Accents
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Brand Colors */
  --color-primary: #2563eb;
  --color-primary-light: #3b82f6;
  --color-primary-dark: #1d4ed8;
  --color-primary-subtle: #eff6ff;
  --color-primary-muted: #dbeafe;

  --color-accent: #e63946;
  --color-accent-light: #ef4444;
  --color-accent-dark: #b91c1c;
  --color-accent-subtle: #fef2f2;

  /* Neutrals */
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fc;
  --color-bg-card: #ffffff;
  --color-surface: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  /* Text */
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #ffffff;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

  --fs-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.75rem);
  --fs-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
  --fs-base: clamp(0.9rem, 0.85rem + 0.25vw, 1rem);
  --fs-md: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --fs-lg: clamp(1.1rem, 1rem + 0.5vw, 1.25rem);
  --fs-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --fs-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
  --fs-3xl: clamp(1.8rem, 1.4rem + 2vw, 2.5rem);
  --fs-4xl: clamp(2.2rem, 1.6rem + 3vw, 3.5rem);
  --fs-5xl: clamp(2.8rem, 2rem + 4vw, 4.5rem);

  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;

  --lh-tight: 1.15;
  --lh-snug: 1.3;
  --lh-normal: 1.6;
  --lh-relaxed: 1.75;

  --ls-tight: -0.025em;
  --ls-normal: 0em;
  --ls-wide: 0.05em;
  --ls-wider: 0.1em;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --section-padding: clamp(4rem, 6vw, 8rem);

  /* Borders & Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.06), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.06), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(15, 23, 42, 0.15);
  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.04), 0 4px 12px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 8px 30px rgba(15, 23, 42, 0.1), 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-primary-glow: 0 4px 20px rgba(37, 99, 235, 0.15);

  /* Transitions */
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;

  /* Z-Index */
  --z-base: 1;
  --z-elevated: 10;
  --z-sticky: 100;
  --z-overlay: 1000;
  --z-modal: 2000;
}

/* ---------- 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;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-size: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-smooth);
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

::selection {
  background-color: var(--color-primary-muted);
  color: var(--color-primary-dark);
}

/* ---------- Utility Classes ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ---------- Section Styles ---------- */
.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section__header {
  text-align: center;
  margin-bottom: clamp(2.5rem, 4vw, 4rem);
}

.section__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  padding: var(--space-xs) var(--space-md);
  background: var(--color-primary-subtle);
  border-radius: var(--radius-full);
}

.section__label svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.section__title {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  max-width: 640px;
  margin: 0 auto;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: all var(--duration-base) var(--ease-smooth);
}

.nav--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: var(--ls-tight);
}

.nav__brand-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  margin-left: 2px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 2rem);
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--duration-fast) var(--ease-smooth);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--duration-base) var(--ease-smooth);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--color-text-inverse);
  background: var(--color-primary);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--duration-base) var(--ease-smooth);
  box-shadow: var(--shadow-primary-glow);
}

.nav__cta:hover {
  background: var(--color-primary-dark);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.25);
}

.nav__mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  background: none;
  border: none;
  cursor: pointer;
  z-index: var(--z-overlay);
}

.nav__mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--duration-base) var(--ease-smooth);
  transform-origin: center;
}

.nav__mobile-toggle--active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__mobile-toggle--active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__mobile-toggle--active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero__bg-gradient {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
}

.hero__bg-gradient--primary {
  background: var(--color-primary-muted);
  top: -10%;
  right: -5%;
}

.hero__bg-gradient--accent {
  background: var(--color-accent-subtle);
  bottom: -10%;
  left: -5%;
  width: 500px;
  height: 500px;
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
  position: relative;
  z-index: var(--z-base);
}

.hero__content {
  max-width: 600px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--color-primary);
  background: var(--color-primary-subtle);
  border: 1px solid var(--color-primary-muted);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-xl);
  letter-spacing: var(--ls-wide);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero__title {
  font-size: var(--fs-5xl);
  font-weight: var(--fw-extrabold);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

.hero__title-highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__description {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-2xl);
  max-width: 520px;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  padding: 14px 28px;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--duration-base) var(--ease-smooth);
  white-space: nowrap;
  border: none;
  cursor: pointer;
}

.btn svg {
  width: 16px;
  height: 16px;
  transition: transform var(--duration-base) var(--ease-smooth);
}

.btn--primary {
  color: var(--color-text-inverse);
  background: var(--color-primary);
  box-shadow: var(--shadow-primary-glow);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.3);
}

.btn--primary:hover svg {
  transform: translateX(3px);
}

.btn--outline {
  color: var(--color-text-primary);
  background: transparent;
  border: 1.5px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-subtle);
  transform: translateY(-2px);
}

.hero__stats {
  display: flex;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.hero__stat {
  text-align: left;
}

.hero__stat-value {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  line-height: var(--lh-tight);
}

.hero__stat-value--accent {
  color: var(--color-accent);
}

.hero__stat-label {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
  margin-top: 2px;
}

.hero__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__image-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
}

.hero__image-ring {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 2px dashed var(--color-primary-muted);
  animation: spin 30s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--color-bg);
  box-shadow: var(--shadow-xl);
}

.hero__float-card {
  position: absolute;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-primary);
  animation: float 6s ease-in-out infinite;
  backdrop-filter: blur(8px);
}

.hero__float-card--top {
  top: 10%;
  right: -10%;
  animation-delay: 0s;
}

.hero__float-card--bottom {
  bottom: 15%;
  left: -10%;
  animation-delay: 3s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.hero__float-card-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.hero__float-card-icon--blue {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

.hero__float-card-icon--red {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.hero__float-card-icon svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ---------- About Section ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
}

.about__image-wrap {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.about__image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-xl);
}

.about__content {
  max-width: 560px;
}

.about__text {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-lg);
}

.about__text strong {
  color: var(--color-text-primary);
  font-weight: var(--fw-semibold);
}

.about__highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.about__highlight {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  transition: all var(--duration-base) var(--ease-smooth);
}

.about__highlight:hover {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-sm);
}

.about__highlight-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.about__highlight-text {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-primary);
  line-height: var(--lh-snug);
}

/* ---------- Expertise Section ---------- */
.expertise__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.expertise__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 2.5vw, 2rem);
  transition: all var(--duration-slow) var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.expertise__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-smooth);
}

.expertise__card:hover {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}

.expertise__card:hover::before {
  opacity: 1;
}

.expertise__card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.expertise__card-icon--blue {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

.expertise__card-icon--red {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.expertise__card-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.expertise__card-title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: var(--lh-snug);
}

.expertise__card-desc {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
}

.expertise__card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
}

.expertise__tag {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  background: var(--color-surface);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-smooth);
}

.expertise__card:hover .expertise__tag {
  color: var(--color-primary);
  background: var(--color-primary-subtle);
}

/* ---------- Impact / Results Section ---------- */
.impact__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

.impact__card {
  text-align: center;
  padding: clamp(1.5rem, 2.5vw, 2.5rem) var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--duration-base) var(--ease-smooth);
}

.impact__card:hover {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}

.impact__card-value {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-extrabold);
  line-height: var(--lh-tight);
  margin-bottom: var(--space-sm);
}

.impact__card-value--blue {
  color: var(--color-primary);
}

.impact__card-value--red {
  color: var(--color-accent);
}

.impact__card-value--dark {
  color: var(--color-text-primary);
}

.impact__card-label {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  font-weight: var(--fw-medium);
  line-height: var(--lh-snug);
}

/* ---------- Experience Section ---------- */
.experience__timeline {
  position: relative;
  padding-left: 32px;
}

.experience__timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent), var(--color-border));
  border-radius: var(--radius-full);
}

.experience__item {
  position: relative;
  padding-bottom: clamp(2rem, 3vw, 3rem);
}

.experience__item:last-child {
  padding-bottom: 0;
}

.experience__dot {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  background: var(--color-bg);
  border: 3px solid var(--color-primary);
  z-index: var(--z-base);
  transition: all var(--duration-base) var(--ease-smooth);
}

.experience__item:hover .experience__dot {
  background: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-muted);
}

.experience__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 2vw, 1.75rem);
  transition: all var(--duration-base) var(--ease-smooth);
}

.experience__item:hover .experience__card {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-card-hover);
}

.experience__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
}

.experience__company {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
}

.experience__duration {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-primary);
  background: var(--color-primary-subtle);
  padding: 3px 12px;
  border-radius: var(--radius-full);
}

.experience__role {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.experience__location {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.experience__location svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

.experience__desc {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

.experience__desc ul {
  padding-left: var(--space-lg);
  list-style: disc;
}

.experience__desc li {
  margin-bottom: var(--space-xs);
}

.experience__desc li::marker {
  color: var(--color-primary);
}

/* ---------- Publications Section ---------- */
.publications__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.publication__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 2vw, 1.75rem);
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  transition: all var(--duration-base) var(--ease-smooth);
  text-decoration: none;
  color: var(--color-text-primary);
}

.publication__card:hover {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
  color: var(--color-text-primary);
}

.publication__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.publication__icon--blue {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

.publication__icon--red {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.publication__icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.publication__title {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-xs);
  line-height: var(--lh-snug);
}

.publication__type {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
}

.publication__arrow {
  margin-left: auto;
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
  transition: all var(--duration-base) var(--ease-smooth);
  flex-shrink: 0;
  margin-top: 4px;
}

.publication__card:hover .publication__arrow {
  color: var(--color-primary);
  transform: translateX(4px);
}

/* ---------- Certifications & Awards ---------- */
.awards__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.awards__column-title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.awards__column-title svg {
  width: 20px;
  height: 20px;
}

.awards__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.award__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--duration-base) var(--ease-smooth);
}

.award__item:hover {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-card);
  transform: translateX(4px);
}

.award__item-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.award__item-icon--cert {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

.award__item-icon--award {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.award__item-icon svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.award__item-name {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-primary);
  line-height: var(--lh-snug);
}

/* ---------- Education Section ---------- */
.education__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.education__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 2vw, 1.75rem);
  transition: all var(--duration-base) var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.education__card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-smooth);
}

.education__card:hover {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}

.education__card:hover::after {
  opacity: 1;
}

.education__card-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

.education__card-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.education__card-degree {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
  line-height: var(--lh-snug);
  margin-bottom: var(--space-xs);
}

.education__card-school {
  font-size: var(--fs-sm);
  color: var(--color-primary);
  font-weight: var(--fw-medium);
  margin-bottom: var(--space-sm);
}

.education__card-period {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.education__card-period svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

/* ---------- Contact Section ---------- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}

.contact__info {
  max-width: 480px;
}

.contact__info-text {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-2xl);
}

.contact__channels {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact__channel {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text-primary);
  transition: all var(--duration-base) var(--ease-smooth);
}

.contact__channel:hover {
  border-color: var(--color-primary-muted);
  box-shadow: var(--shadow-card);
  transform: translateX(4px);
  color: var(--color-text-primary);
}

.contact__channel-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.contact__channel-icon--email {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

.contact__channel-icon--linkedin {
  background: #eff6ff;
  color: #0a66c2;
}

.contact__channel-icon--blog {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.contact__channel-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.contact__channel-label {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: var(--ls-wide);
}

.contact__channel-value {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-primary);
}

.contact__form {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: var(--shadow-card);
}

.contact__form-title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xl);
}

.form__group {
  margin-bottom: var(--space-lg);
}

.form__label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.form__input,
.form__textarea {
  width: 100%;
  font-family: var(--font-family);
  font-size: var(--fs-sm);
  color: var(--color-text-primary);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: all var(--duration-fast) var(--ease-smooth);
}

.form__input:hover,
.form__textarea:hover {
  border-color: var(--color-text-muted);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-muted);
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: var(--color-text-muted);
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

.form__submit {
  width: 100%;
  font-size: var(--fs-base);
  padding: 14px 28px;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  text-decoration: none;
}

.footer__text {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.footer__socials {
  display: flex;
  gap: var(--space-md);
}

.footer__social {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--duration-base) var(--ease-smooth);
}

.footer__social:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-glow);
}

.footer__social svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slower) var(--ease-smooth),
              transform var(--duration-slower) var(--ease-smooth);
}

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

.reveal--delay-1 { transition-delay: 100ms; }
.reveal--delay-2 { transition-delay: 200ms; }
.reveal--delay-3 { transition-delay: 300ms; }
.reveal--delay-4 { transition-delay: 400ms; }

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--duration-base) var(--ease-smooth);
  z-index: var(--z-elevated);
  box-shadow: var(--shadow-primary-glow);
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__content {
    max-width: 640px;
    margin: 0 auto;
  }

  .hero__description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__stats {
    justify-content: center;
  }

  .hero__visual {
    max-width: 360px;
    margin: 0 auto;
    order: -1;
    margin-bottom: var(--space-xl);
  }

  .hero__float-card--top {
    right: -5%;
    top: 5%;
  }

  .hero__float-card--bottom {
    left: -5%;
    bottom: 10%;
  }

  .about__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about__content {
    max-width: 640px;
    margin: 0 auto;
  }

  .about__image-wrap {
    max-width: 480px;
    margin: 0 auto;
  }

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

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

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

  .contact__info {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-xl);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-smooth);
    z-index: calc(var(--z-overlay) - 1);
  }

  .nav__links--open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: var(--fs-lg);
  }

  .nav__cta {
    font-size: var(--fs-sm);
    padding: 10px 20px;
  }

  .nav__mobile-toggle {
    display: flex;
  }

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

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

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

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

  .hero__float-card {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero__stats {
    flex-direction: column;
    gap: var(--space-md);
  }

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

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

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}