:root {
  --font-sans: "Inter", sans-serif;
  --font-heading: "Sora", sans-serif;
  --font-mono: "Inter", sans-serif;

  --color-bg-page: #eaf6ff;
  --color-bg-section: #f4fbff;
  --color-bg-nav: rgba(234, 246, 255, 0.62);
  --color-bg-nav-scrolled: rgba(227, 243, 255, 0.95);
  --color-bg-overlay: rgba(226, 241, 255, 0.98);
  --color-text-primary: #0f2e4f;
  --color-text-secondary: #356487;
  --color-text-inverse: #f6fbff;
  --color-link-soft: #1f5ea8;
  --color-link-strong: #ffffff;
  --color-line: rgba(59, 130, 246, 0.14);
  --color-line-strong: rgba(16, 185, 129, 0.32);
  --color-line-soft: rgba(59, 130, 246, 0.16);
  --color-line-input: rgba(59, 130, 246, 0.25);
  --color-glow-primary: rgba(59, 130, 246, 0.45);
  --color-glow-soft: rgba(16, 185, 129, 0.25);
  --color-shadow-lift: rgba(0, 0, 0, 0.35);
  --color-shadow-button: rgba(31, 94, 168, 0.24);
  --color-bg-footer: #dff2ff;
  --color-hero-gradient-a: rgba(59, 130, 246, 0.35);
  --color-hero-gradient-b: rgba(16, 185, 129, 0.32);
  --color-hero-base-0: #dff2ff;
  --color-hero-base-1: #d4eeff;
  --color-hero-base-2: #cdf0e9;
  --color-hero-blob-a: #3b82f6;
  --color-hero-blob-b: #10b981;
  --color-hero-typing: #0b4f89;
  --color-hero-particle: rgba(59, 130, 246, 0.38);
  --color-card-bg-a: rgba(255, 255, 255, 0.05);
  --color-card-bg-b: rgba(255, 255, 255, 0.015);
  --color-card-tag-bg-fallback: rgba(255, 255, 255, 0.08);
  --color-card-hover-border: rgba(16, 185, 129, 0.45);
  --color-skill-text: #124067;
  --color-skill-bg-a: rgba(255, 255, 255, 0.045);
  --color-skill-bg-b: rgba(255, 255, 255, 0.015);
  --color-skill-hover-border: rgba(59, 130, 246, 0.68);
  --color-about-gradient-a: rgba(59, 130, 246, 0.22);
  --color-about-gradient-b: rgba(16, 185, 129, 0.18);
  --color-about-base-0: #e0f3ff;
  --color-about-base-1: #d9efff;
  --color-about-orb-border: rgba(59, 130, 246, 0.62);
  --color-about-orb-shadow: rgba(59, 130, 246, 0.2);
  --color-about-ring-border: rgba(16, 185, 129, 0.52);
  --color-about-grid-line: rgba(255, 255, 255, 0.06);
  --color-form-label: #1e4f7e;
  --color-form-bg: rgba(255, 255, 255, 0.8);
  --color-form-text: #143a60;
  --color-form-focus: rgba(59, 130, 246, 0.45);
  --color-icon-border: rgba(255, 255, 255, 0.15);
  --color-icon-text: #0f4676;
  --color-icon-bg-a: rgba(59, 130, 246, 0.12);
  --color-icon-bg-b: rgba(16, 185, 129, 0.1);
  --color-icon-hover-border: rgba(16, 185, 129, 0.62);
  --color-icon-hover-shadow: rgba(59, 130, 246, 0.25);
  --color-navbar-toggle-bar: #1f5ea8;
  --color-form-surface-a: rgba(255, 255, 255, 0.05);
  --color-form-surface-b: rgba(255, 255, 255, 0.02);

  --color-accent: #3b82f6;
  --color-accent-alt: #10b981;
  --color-tag-react: #61dafb;
  --color-tag-node: #81c784;
  --color-tag-postgres: #8ab4f8;
  --color-tag-python: #ffd166;
  --color-tag-fastapi: #59f0c4;
  --color-tag-openai: #b9a6ff;
  --color-tag-js: #ffe082;
  --color-tag-mapbox: #5ec8ff;
  --color-tag-firebase: #ffb74d;

  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 2rem;
  --space-8: 3rem;
  --space-9: 5rem;
  --space-button-y: 0.84rem;
  --space-button-x: 1.4rem;
  --space-brand-gap: 0.55rem;
  --space-hero-title-top: 0.65rem;
  --space-hero-tagline-top: 1.2rem;
  --space-hero-typing-top: 1.3rem;
  --space-inline-xs: 0.15rem;
  --space-heading-subtitle-top: 0.4rem;
  --space-card-gap: 0.95rem;
  --space-card-pad: 1.2rem;
  --space-tag-y: 0.33rem;
  --space-tag-x: 0.64rem;
  --space-link-gap: 0.9rem;
  --space-skills-top: 1.8rem;
  --space-skill-gap: 0.9rem;
  --space-skill-inner-gap: 0.45rem;
  --space-contact-grid-gap: 1.1rem;
  --space-form-gap: 0.55rem;
  --space-form-input-y: 0.7rem;
  --space-icon-gap: 0.75rem;
  --space-icon-y: 0.85rem;
  --space-icon-x: 0.95rem;
  --space-contact-social-gap: 0.8rem;

  --size-container: min(1120px, 92vw);
  --size-header: 70px;
  --size-radius-sm: 0.7rem;
  --size-radius-md: 1rem;
  --size-radius-pill: 999px;

  --dur-fast: 160ms;
  --dur-med: 240ms;
  --dur-slow: 300ms;
  --ease-default: ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: var(--space-0);
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.6;
  background: var(--color-bg-page);
  color: var(--color-text-primary);
}

h1,
h2,
h3,
.navbar-brand {
  font-family: var(--font-heading);
}

a {
  color: inherit;
}

.container {
  width: var(--size-container);
  margin: var(--space-0) auto;
}

.section-block {
  padding: var(--space-9) 0;
}

main {
  padding-top: 0;
}

.section-projects,
.section-skills,
.section-about,
.section-contact,
.section-experience,
.section-certifications,
.section-education {
  background: var(--color-bg-section);
  border-top: 1px solid var(--color-line);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--size-radius-pill);
  text-decoration: none;
  font-weight: 600;
  padding: var(--space-button-y) var(--space-button-x);
}

.button-primary {
  border: 0;
  color: var(--color-text-inverse);
  background: linear-gradient(110deg, var(--color-accent), var(--color-accent-alt));
  box-shadow: 0 12px 30px var(--color-shadow-button);
  transition: transform var(--dur-fast) var(--ease-default);
}

.button-primary:hover,
.button-primary:focus-visible {
  transform: translateY(-1px);
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
  z-index: 999;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--space-1);
  background: var(--color-link-strong);
  color: var(--color-bg-page);
}

.footer-site {
  border-top: 1px solid var(--color-line);
  background: linear-gradient(180deg, #e8f5ff, #e0f3ff);
  color: var(--color-text-secondary);
}

.footer-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) 0;
}

.footer-name {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
}

.footer-links {
  display: inline-flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-link-soft);
  text-decoration: none;
  width: 42px;
  min-height: 44px;
  border-radius: 999px;
  border: 1px solid rgba(59, 130, 246, 0.22);
  background: linear-gradient(140deg, rgba(59, 130, 246, 0.1), rgba(16, 185, 129, 0.08));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.2rem 0;
  box-shadow: 0 4px 12px rgba(31, 94, 168, 0.08);
  transition: color var(--dur-fast) var(--ease-default),
    border-color var(--dur-fast) var(--ease-default), transform var(--dur-fast) var(--ease-default),
    box-shadow var(--dur-fast) var(--ease-default);
}

.footer-links a svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-text-primary);
  border-color: rgba(16, 185, 129, 0.6);
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(16, 185, 129, 0.16);
}

.js [data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.js [data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  margin: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(59, 130, 246, 0.14);
  background: rgba(234, 246, 255, 0.99);
  backdrop-filter: none;
  border-radius: 0;
  box-shadow: 0 1px 8px rgba(31, 94, 168, 0.06);
  transition: background 220ms var(--ease-default), border-color 220ms var(--ease-default);
}

.navbar-inner {
  min-height: var(--size-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-brand-gap);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.navbar-right {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: nowrap;
}

.navbar-menu ul {
  margin: var(--space-0);
  padding: var(--space-0);
  list-style: none;
  display: flex;
  flex-wrap: nowrap;
  gap: 1.25rem;
}

.navbar-menu a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: color var(--dur-fast) var(--ease-default),
    background-color var(--dur-fast) var(--ease-default), box-shadow var(--dur-fast) var(--ease-default);
}

.navbar-menu a:hover,
.navbar-menu a:focus-visible {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.58);
  box-shadow: 0 0 0 1px rgba(16, 185, 129, 0.16) inset;
}

.navbar-toggle {
  display: none;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  padding: 0;
  border: 0;
  background: transparent;
}

.lang-button {
  min-height: 36px;
  min-width: 54px;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--color-line);
  background: rgba(255, 255, 255, 0.52);
  color: var(--color-text-primary);
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-default),
    box-shadow var(--dur-fast) var(--ease-default), border-color var(--dur-fast) var(--ease-default);
}

.lang-button:hover,
.lang-button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(16, 185, 129, 0.48);
  box-shadow: 0 0 0 1px rgba(16, 185, 129, 0.14) inset;
}

/* Hero */
.section-hero {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding-top: 0;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 12% 18%, var(--color-hero-gradient-a), transparent 35%),
    radial-gradient(circle at 88% 82%, var(--color-hero-gradient-b), transparent 40%),
    linear-gradient(
      125deg,
      var(--color-hero-base-0),
      var(--color-hero-base-1),
      var(--color-hero-base-2)
    );
  background-size: 120% 120%;
  animation: bg-shift 16s ease-in-out infinite alternate;
}

.section-hero::before,
.section-hero::after {
  content: "";
  position: absolute;
  width: 28rem;
  aspect-ratio: 1;
  border-radius: 40% 60% 45% 55%;
  filter: blur(40px);
  opacity: 0.22;
  z-index: -1;
}

.section-hero::before {
  top: -8rem;
  left: -8rem;
  background: var(--color-hero-blob-a);
  animation: float-a 15s ease-in-out infinite;
}

.section-hero::after {
  right: -8rem;
  bottom: -8rem;
  background: var(--color-hero-blob-b);
  animation: float-b 18s ease-in-out infinite;
}

.hero-layout {
  display: flex;
  justify-content: center;
  width: 100%;
  position: relative;
}

.hero-main {
  width: 100%;
  max-width: 980px;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
  align-items: start;
  justify-items: center;
}

.hero-content {
  width: 100%;
}

.hero-content-right {
  max-width: 860px;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.hero-content-left {
  max-width: 820px;
  text-align: center;
}

.hero-eyebrow {
  margin: var(--space-0);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.hero-heading {
  margin: var(--space-hero-title-top) 0 0;
  font-size: 72px;
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.hero-tagline {
  margin: var(--space-hero-tagline-top) 0 0;
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.hero-tagline span {
  display: block;
}

.hero-description {
  max-width: 72ch;
  margin: var(--space-4) 0 0;
  color: var(--color-text-primary);
}

.hero-panel-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0;
  color: var(--color-text-secondary);
}

.hero-focus {
  margin: var(--space-3) 0 0;
  color: var(--color-text-primary);
  font-weight: 600;
}

.hero-focus-tags {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.hero-focus-tags li {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--size-radius-pill);
  min-height: 36px;
  padding: 0.3rem 0.8rem;
  border: 1px solid rgba(59, 130, 246, 0.22);
  background: linear-gradient(120deg, rgba(59, 130, 246, 0.12), rgba(16, 185, 129, 0.1));
  color: #0f4776;
  font-size: 0.9rem;
  font-weight: 600;
}

.hero-actions {
  margin-top: var(--space-6);
  display: flex;
  justify-content: center;
}

.hero-typing {
  margin: var(--space-hero-typing-top) 0 var(--space-7);
  min-height: 1.6em;
  font-family: var(--font-mono);
  color: var(--color-hero-typing);
}

#typed-skill {
  color: var(--color-accent);
}

.typing-cursor {
  display: inline-block;
  width: 0.65ch;
  margin-left: var(--space-inline-xs);
  animation: blink 0.9s steps(1) infinite;
}

.section-hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

.section-hero-particles span {
  position: absolute;
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-hero-particle);
  animation: drift var(--dur, 14s) linear infinite;
  animation-delay: var(--delay, 0s);
}

.section-hero-particles span:nth-child(1) {
  left: 10%;
  top: 82%;
  --dur: 12s;
}
.section-hero-particles span:nth-child(2) {
  left: 20%;
  top: 64%;
  --dur: 18s;
  --delay: 2s;
}
.section-hero-particles span:nth-child(3) {
  left: 35%;
  top: 90%;
  --dur: 15s;
  --delay: 5s;
}
.section-hero-particles span:nth-child(4) {
  left: 52%;
  top: 76%;
  --dur: 16s;
}
.section-hero-particles span:nth-child(5) {
  left: 64%;
  top: 88%;
  --dur: 13s;
  --delay: 4s;
}
.section-hero-particles span:nth-child(6) {
  left: 78%;
  top: 70%;
  --dur: 19s;
}
.section-hero-particles span:nth-child(7) {
  left: 88%;
  top: 84%;
  --dur: 14s;
  --delay: 1s;
}
.section-hero-particles span:nth-child(8) {
  left: 46%;
  top: 60%;
  --dur: 17s;
  --delay: 3s;
}

/* Projects */
.projects-heading p {
  margin: var(--space-heading-subtitle-top) 0 0;
  color: var(--color-text-secondary);
}

.projects-grid {
  margin-top: var(--space-7);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-card-pad);
}

.experience-grid {
  margin-top: var(--space-7);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-card-pad);
}

.education-grid {
  margin-top: var(--space-7);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-card-pad);
}

.card-project {
  display: flex;
  flex-direction: column;
  gap: var(--space-card-gap);
  padding: var(--space-card-pad);
  border-radius: var(--size-radius-md);
  border: 1px solid var(--color-line);
  background: linear-gradient(180deg, var(--color-card-bg-a), var(--color-card-bg-b));
  transition: transform 280ms var(--ease-default), box-shadow 280ms var(--ease-default),
    border-color 280ms var(--ease-default);
}

.card-project h3 {
  margin: var(--space-0);
  font-size: 1.3rem;
}

.card-project-desc {
  margin: var(--space-0);
  color: var(--color-text-secondary);
  min-height: 3.2em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-project-tags {
  margin: var(--space-0);
  padding: var(--space-0);
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.card-project-tags li {
  border-radius: var(--size-radius-pill);
  padding: var(--space-tag-y) var(--space-tag-x);
  border: 1px solid currentColor;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--color-card-tag-bg-fallback);
  background: color-mix(in srgb, var(--tag-color) 16%, transparent);
  color: var(--tag-color);
  opacity: 0.8;
  transform: translateY(10px) scale(0.98);
  transition: transform 250ms var(--ease-default), opacity 250ms var(--ease-default),
    filter 250ms var(--ease-default);
}

.card-project-tags li:nth-child(2) {
  transition-delay: 40ms;
}

.card-project-tags li:nth-child(3) {
  transition-delay: 80ms;
}

.card-project:hover {
  transform: translateY(-8px);
  border-color: var(--color-card-hover-border);
  box-shadow: 0 16px 34px var(--color-shadow-lift);
}

.card-project:hover .card-project-tags li {
  transform: translateY(0) scale(1);
  opacity: 1;
  filter: saturate(1.12);
}

.card-project-links {
  margin-top: auto;
  display: flex;
  gap: var(--space-link-gap);
}

.card-project-links a {
  font-size: 0.92rem;
  text-decoration: none;
  color: var(--color-link-soft);
}

.card-project-links a:hover,
.card-project-links a:focus-visible {
  color: var(--color-link-strong);
}

.card-experience {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-card-pad);
  border-radius: var(--size-radius-md);
  border: 1px solid var(--color-line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.7), rgba(240, 250, 255, 0.85));
  box-shadow: 0 10px 26px rgba(31, 94, 168, 0.08);
  transition: transform 280ms var(--ease-default), box-shadow 280ms var(--ease-default),
    border-color 280ms var(--ease-default);
}

.card-experience:hover {
  transform: translateY(-6px);
  border-color: var(--color-card-hover-border);
  box-shadow: 0 18px 34px rgba(31, 94, 168, 0.14);
}

.card-experience h3 {
  margin: 0;
}

.card-education {
  padding: var(--space-card-pad);
  border-radius: var(--size-radius-md);
  border: 1px solid var(--color-line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.74), rgba(239, 250, 255, 0.9));
  box-shadow: 0 10px 24px rgba(31, 94, 168, 0.08);
  transition: transform 260ms var(--ease-default), box-shadow 260ms var(--ease-default),
    border-color 260ms var(--ease-default);
}

.card-education:hover {
  transform: translateY(-5px);
  border-color: var(--color-card-hover-border);
  box-shadow: 0 16px 30px rgba(16, 185, 129, 0.14);
}

.card-education h3 {
  margin: 0 0 var(--space-2);
}

.edu-school {
  margin: 0;
  color: var(--color-text-primary);
  font-weight: 600;
}

.edu-meta {
  margin: var(--space-2) 0 0;
  color: var(--color-text-secondary);
}

.exp-role {
  margin: 0;
  color: var(--color-text-primary);
  font-weight: 600;
}

.exp-date {
  margin: 0;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.exp-list {
  margin: var(--space-2) 0 0;
  padding-left: 1.2rem;
  color: var(--color-text-secondary);
}

.exp-list li + li {
  margin-top: var(--space-1);
}

.tag-react {
  --tag-color: var(--color-tag-react);
}

.tag-node {
  --tag-color: var(--color-tag-node);
}

.tag-postgres {
  --tag-color: var(--color-tag-postgres);
}

.tag-python {
  --tag-color: var(--color-tag-python);
}

.tag-fastapi {
  --tag-color: var(--color-tag-fastapi);
}

.tag-openai {
  --tag-color: var(--color-tag-openai);
}

.tag-js {
  --tag-color: var(--color-tag-js);
}

.tag-mapbox {
  --tag-color: var(--color-tag-mapbox);
}

.tag-firebase {
  --tag-color: var(--color-tag-firebase);
}

/* Skills */
.skills-grid {
  margin: var(--space-skills-top) 0 0;
  padding: var(--space-0);
  list-style: none;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-skill-gap);
}

.card-skill {
  min-height: 96px;
  display: grid;
  place-content: center;
  gap: var(--space-skill-inner-gap);
  text-align: center;
  color: var(--color-skill-text);
  border-radius: 0.95rem;
  border: 1px solid var(--color-line-soft);
  background: linear-gradient(180deg, var(--color-skill-bg-a), var(--color-skill-bg-b));
  transition: transform var(--dur-med) var(--ease-default),
    box-shadow var(--dur-med) var(--ease-default), border-color var(--dur-med) var(--ease-default);
  animation: skill-float 3.8s ease-in-out infinite;
}

.card-skill i {
  font-size: 1.65rem;
}

.card-skill span {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.card-skill:hover {
  transform: translateY(-5px);
  border-color: var(--color-skill-hover-border);
  box-shadow: 0 0 22px var(--color-glow-soft);
}

.card-skill:nth-child(2n) {
  animation-delay: 0.35s;
}

.card-skill:nth-child(3n) {
  animation-delay: 0.7s;
}

.skills-groups {
  margin-top: var(--space-7);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.skills-group {
  padding: var(--space-5);
  border: 1px solid var(--color-line);
  border-radius: var(--size-radius-md);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 8px 22px rgba(31, 94, 168, 0.08);
}

.skills-group h3 {
  margin-top: 0;
  margin-bottom: var(--space-3);
}

.skills-badges {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.badge-tech {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--size-radius-pill);
  min-height: 38px;
  padding: 0.35rem 0.85rem;
  border: 1px solid rgba(59, 130, 246, 0.25);
  background: linear-gradient(120deg, rgba(59, 130, 246, 0.12), rgba(16, 185, 129, 0.11));
  color: #0d4f7f;
  font-weight: 600;
  font-size: 0.92rem;
  transition: transform 200ms var(--ease-default), box-shadow 200ms var(--ease-default),
    border-color 200ms var(--ease-default);
}

.badge-tech:hover {
  transform: translateY(-2px);
  border-color: rgba(16, 185, 129, 0.55);
  box-shadow: 0 8px 18px rgba(16, 185, 129, 0.18);
}

.cert-grid {
  margin-top: var(--space-7);
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-card-pad);
}

.card-cert {
  padding: var(--space-card-pad);
  border-radius: var(--size-radius-md);
  border: 1px solid var(--color-line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(238, 250, 255, 0.92));
  box-shadow: 0 10px 24px rgba(31, 94, 168, 0.08);
  transition: transform 260ms var(--ease-default), box-shadow 260ms var(--ease-default),
    border-color 260ms var(--ease-default);
}

.card-cert:hover {
  transform: translateY(-5px);
  border-color: var(--color-card-hover-border);
  box-shadow: 0 16px 30px rgba(16, 185, 129, 0.14);
}

.cert-date {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.card-cert h3 {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text-primary);
  line-height: 1.5;
}

.cert-desc {
  margin: var(--space-2) 0 0;
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  line-height: 1.5;
}

/* About */
.about-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: var(--space-7);
}

.about-content p {
  margin-bottom: var(--space-0);
  max-width: 60ch;
  color: var(--color-text-secondary);
}

.about-visual {
  position: relative;
  min-height: 340px;
  overflow: hidden;
  border-radius: 1.2rem;
  border: 1px solid var(--color-line-soft);
  background:
    radial-gradient(circle at 30% 20%, var(--color-about-gradient-a), transparent 44%),
    radial-gradient(circle at 70% 78%, var(--color-about-gradient-b), transparent 42%),
    linear-gradient(145deg, var(--color-about-base-0), var(--color-about-base-1));
  display: grid;
  justify-items: center;
  align-items: center;
  padding: var(--space-5);
}

.about-frame {
  width: min(100%, 352px);
  border-radius: 1.35rem;
  padding: 0.7rem;
  border: 1px solid rgba(59, 130, 246, 0.28);
  background: linear-gradient(155deg, rgba(244, 251, 255, 0.96), rgba(225, 244, 255, 0.9));
  box-shadow: 0 16px 34px rgba(31, 94, 168, 0.14);
}

.about-frame-inner {
  border-radius: 1rem;
  padding: 0.7rem;
  border: 1px solid rgba(59, 130, 246, 0.18);
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.95), rgba(239, 249, 255, 0.92));
  min-height: 292px;
  display: grid;
  place-items: center;
}

.about-illustration {
  width: min(100%, 286px);
  max-height: 308px;
  height: auto;
  border-radius: 0.9rem;
  object-fit: cover;
  box-shadow: 0 10px 22px rgba(31, 94, 168, 0.12);
}

/* Contact */
.contact-layout {
  display: grid;
  gap: var(--space-6);
  max-width: 860px;
  margin: 0 auto;
}

.contact-intro h2 {
  margin-bottom: 0.45rem;
}

.contact-cta {
  margin: var(--space-0);
  color: var(--color-text-secondary);
}

.contact-line {
  margin: var(--space-2) 0 0;
  color: var(--color-text-primary);
}

.contact-line a {
  color: var(--color-link-soft);
  text-decoration: none;
}

.contact-line a:hover,
.contact-line a:focus-visible {
  color: var(--color-text-primary);
}

.contact-social {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-contact-social-gap);
}

.button-icon {
  display: flex;
  align-items: center;
  gap: var(--space-icon-gap);
  padding: var(--space-icon-y) var(--space-icon-x);
  border-radius: 0.9rem;
  border: 1px solid var(--color-icon-border);
  text-decoration: none;
  color: var(--color-icon-text);
  background: linear-gradient(150deg, var(--color-icon-bg-a), var(--color-icon-bg-b));
  transition: transform 180ms var(--ease-default), box-shadow 180ms var(--ease-default),
    border-color 180ms var(--ease-default);
}

.button-icon svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.button-icon span {
  font-weight: 600;
}

.button-icon:hover,
.button-icon:focus-visible {
  transform: translateY(-3px);
  border-color: var(--color-icon-hover-border);
  box-shadow: 0 10px 25px var(--color-icon-hover-shadow);
}

/* Motion */
@keyframes bg-shift {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 100% 50%;
  }
}

@keyframes drift {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0;
  }
  15% {
    opacity: 0.65;
  }
  100% {
    transform: translate3d(6px, -120vh, 0) scale(0.2);
    opacity: 0;
  }
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

@keyframes float-a {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(36px, 28px) rotate(22deg);
  }
}

@keyframes float-b {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(-32px, -22px) rotate(-20deg);
  }
}

@keyframes spin-slow {
  from {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

@keyframes wobble {
  0%,
  100% {
    transform: translate(-50%, -50%) rotate(18deg);
  }
  50% {
    transform: translate(-50%, -50%) rotate(-8deg) scale(1.03);
  }
}

@keyframes skill-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-3px);
  }
}

@media (min-width: 640px) and (max-width: 1024px) {
  .navbar-inner {
    min-height: 62px;
  }

  .navbar-menu ul {
    gap: 1.15rem;
  }

  .navbar-menu a {
    font-size: 0.95rem;
  }

  .hero-layout {
    display: flex;
  }

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

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

  .experience-grid > *,
  .education-grid > *,
  .about-layout > *,
  .skills-groups > *,
  .cert-grid > * {
    min-width: 0;
  }
}

@media (max-width: 639px) {
  .navbar {
    width: 100%;
    border-radius: 0;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
  }

  .hero-layout {
    display: flex;
  }

  .hero-content-right {
    padding: 0;
  }

  .experience-grid,
  .education-grid,
  .about-layout,
  .skills-groups,
  .cert-grid {
    grid-template-columns: 1fr;
  }

  .navbar-right {
    display: contents;
  }

  .lang-switcher {
    display: none;
  }

  .hero-heading {
    font-size: clamp(2rem, 12vw, 3.2rem);
  }

  .hero-tagline {
    font-size: 1.1rem;
  }

  .about-visual {
    min-height: 220px;
  }

  .about-frame {
    width: min(100%, 320px);
  }

  .about-frame-inner {
    min-height: 250px;
    padding: 0.55rem;
  }

  .about-illustration {
    width: min(100%, 250px);
    max-height: 270px;
  }

  .navbar-menu {
    display: none;
  }

  .navbar-menu.is-open {
    display: block;
    position: absolute;
    top: var(--size-header);
    right: var(--space-3);
    left: var(--space-3);
    max-width: calc(100vw - (var(--space-3) * 2));
    padding: var(--space-4);
    border-radius: var(--space-3);
    border: 1px solid var(--color-line);
    background: var(--color-bg-overlay);
  }

  .navbar-menu ul {
    flex-direction: column;
    gap: var(--space-3);
  }

  .navbar-toggle {
    display: inline-flex;
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-2);
    border: 0;
    background: transparent;
    cursor: pointer;
  }

  .navbar-toggle span {
    width: 24px;
    height: 2px;
    border-radius: 2px;
    background: var(--color-navbar-toggle-bar);
  }

  .experience-grid > *,
  .education-grid > *,
  .about-layout > *,
  .skills-groups > *,
  .cert-grid > * {
    min-width: 0;
  }
}

@media (any-pointer: coarse) {
  .button,
  .button-icon,
  .navbar-toggle,
  .navbar-menu a,
  .card-project-links a,
  .badge-tech {
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
  }
}

@media (min-width: 1025px) {
  .hero-layout > *,
  .experience-grid > *,
  .education-grid > *,
  .about-layout > *,
  .skills-groups > *,
  .cert-grid > * {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}