/* 1. CSS Variables */
:root {
  color-scheme: dark;
  --color-primary: #60a5fa;
  --color-secondary: #a78bfa;
  --color-background: #080b14;
  --color-surface: #111827;
  --color-surface-soft: #0f172a;
  --color-text: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-border: #273449;
  --color-success: #34d399;
  --color-warning: #fbbf24;
  --color-accent-soft: #172554;
  --color-tooltip: #020617;
  --gradient-accent: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --gradient-action: linear-gradient(135deg, #2563eb, #7c3aed);
  --gradient-soft: linear-gradient(135deg, rgba(96, 165, 250, 0.16), rgba(167, 139, 250, 0.14));

  --font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-xs: 0.78rem;
  --font-size-sm: 0.9rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.12rem;
  --font-size-xl: 1.35rem;
  --font-size-2xl: 2rem;
  --font-size-hero: 3.75rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-sm: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.5rem;

  --shadow-sm: 0 14px 32px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 22px 54px rgba(0, 0, 0, 0.38);
  --shadow-glow: 0 18px 45px rgba(96, 165, 250, 0.22);

  --container-width: 1180px;
  --header-height: 74px;
  --transition-fast: 180ms ease;
  --transition-medium: 260ms ease;
}

/* 2. Reset / Global Styles */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

::selection {
  background: rgba(96, 165, 250, 0.24);
}

/* 3. Utility Classes */
.container {
  width: min(100% - 2rem, var(--container-width));
  margin-inline: auto;
}

.section {
  padding: var(--space-16) 0;
}

.section-soft {
  background:
    linear-gradient(180deg, rgba(8, 11, 20, 0), rgba(15, 23, 42, 0.82)),
    #0b1220;
}

.section-header {
  max-width: 760px;
  margin-bottom: var(--space-10);
}

.section-header h2,
.resume-layout h2 {
  margin-top: var(--space-2);
  color: var(--color-text);
  font-size: var(--font-size-2xl);
  line-height: 1.2;
}

.section-header p:last-child,
.resume-layout p:last-child {
  margin-top: var(--space-4);
  color: var(--color-text-secondary);
}

.section-label {
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 1.15rem;
  border-radius: 999px;
  font-size: var(--font-size-sm);
  font-weight: 800;
  line-height: 1.2;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
}

.btn:focus-visible,
.nav-link:focus-visible,
.language-btn:focus-visible,
.text-link:focus-visible,
.contact-icon:focus-visible,
.github-mark:focus-visible,
.skills-grid:focus-visible,
.projects-grid:focus-visible,
.scroll-top:focus-visible {
  outline: 3px solid rgba(96, 165, 250, 0.34);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--gradient-action);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  box-shadow: 0 24px 54px rgba(96, 165, 250, 0.26);
}

.btn-secondary {
  border: 1px solid var(--color-border);
  background: rgba(15, 23, 42, 0.88);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: rgba(96, 165, 250, 0.58);
  color: var(--color-primary);
}

.text-link {
  color: var(--color-primary);
  font-weight: 800;
  transition: color var(--transition-fast);
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--color-secondary);
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  transform: translateY(-180%);
  border-radius: var(--radius-sm);
  background: var(--color-tooltip);
  color: #ffffff;
  padding: 0.65rem 0.9rem;
  font-weight: 800;
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
}

/* 4. Header / Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--header-height);
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(8, 11, 20, 0.86);
  backdrop-filter: blur(18px);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--space-6);
}

.logo {
  display: inline-flex;
  align-items: center;
  color: var(--color-text);
  font-size: var(--font-size-lg);
  font-weight: 900;
  white-space: nowrap;
}

.logo::before {
  content: "⌘";
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-right: var(--space-3);
  border-radius: 12px;
  background: var(--gradient-action);
  color: #ffffff;
  font-size: var(--font-size-sm);
  box-shadow: var(--shadow-glow);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 800;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  background: rgba(96, 165, 250, 0.14);
  color: var(--color-primary);
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  padding: 0.25rem;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.24);
}

.language-btn {
  min-width: 42px;
  border-radius: 999px;
  background: transparent;
  color: var(--color-text-secondary);
  padding: 0.45rem 0.55rem;
  font-size: var(--font-size-xs);
  font-weight: 900;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.language-btn.active {
  background: var(--gradient-action);
  color: #ffffff;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  border-radius: 999px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 5. Hero Section */
.hero {
  position: relative;
  overflow: hidden;
  padding: 7rem 0 4.5rem;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(96, 165, 250, 0.16), transparent 36%),
    linear-gradient(300deg, rgba(167, 139, 250, 0.14), transparent 42%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(96, 165, 250, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(96, 165, 250, 0.08) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.45), transparent 72%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.72fr);
  align-items: center;
  gap: var(--space-12);
}

.hero-content h1 {
  max-width: 760px;
  color: var(--color-text);
  font-size: var(--font-size-hero);
  font-weight: 950;
  line-height: 1.05;
}

.hero-subtitle {
  margin-top: var(--space-4);
  background: var(--gradient-accent);
  background-clip: text;
  color: transparent;
  font-size: var(--font-size-xl);
  font-weight: 900;
}

.hero-description {
  max-width: 620px;
  margin-top: var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  max-width: 620px;
  margin-top: var(--space-8);
}

.hero-highlight {
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.82);
  padding: var(--space-4);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.24);
}

.hero-highlight strong,
.hero-highlight span {
  display: block;
}

.hero-highlight strong {
  color: var(--color-text);
  font-size: var(--font-size-lg);
  line-height: 1.25;
}

.hero-highlight span {
  margin-top: 0.2rem;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.hero-card {
  position: relative;
  isolation: isolate;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: var(--radius-xl);
  background: rgba(15, 23, 42, 0.88);
  box-shadow: var(--shadow-md);
  padding: var(--space-5);
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(96, 165, 250, 0.14), rgba(167, 139, 250, 0.12));
  transform: translate(12px, 12px);
}

.profile-image-wrap {
  width: min(220px, 72%);
  aspect-ratio: 1 / 1;
  margin-inline: auto;
  overflow: hidden;
  border: 4px solid rgba(15, 23, 42, 0.94);
  border-radius: 50%;
  background: var(--gradient-accent);
  box-shadow: var(--shadow-glow);
}

.profile-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.hero-card-content {
  margin-top: var(--space-5);
  text-align: center;
}

.profile-name {
  color: var(--color-text);
  font-size: var(--font-size-xl);
  font-weight: 900;
}

.profile-role {
  margin-top: var(--space-2);
  color: var(--color-text-secondary);
}

.profile-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.profile-tags span,
.tag-list span {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(96, 165, 250, 0.24);
  border-radius: 999px;
  background: rgba(96, 165, 250, 0.12);
  color: #bfdbfe;
  padding: 0.35rem 0.65rem;
  font-size: var(--font-size-xs);
  font-weight: 800;
  line-height: 1.2;
}

/* 6. About Section */
.about-section {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(96, 165, 250, 0.11), transparent 34%),
    linear-gradient(315deg, rgba(167, 139, 250, 0.1), transparent 42%),
    var(--color-background);
}

.about-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(96, 165, 250, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(96, 165, 250, 0.07) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.42), transparent);
  pointer-events: none;
}

.about-section .container {
  position: relative;
  z-index: 1;
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr);
  align-items: start;
  gap: var(--space-8);
}

.about-copy {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(96, 165, 250, 0.2);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(96, 165, 250, 0.12), rgba(167, 139, 250, 0.09)),
    rgba(15, 23, 42, 0.92);
  padding: var(--space-8);
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-md);
}

.about-copy::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 6px;
  background: var(--gradient-accent);
}

.about-copy::after {
  content: "LW";
  position: absolute;
  right: var(--space-6);
  bottom: var(--space-5);
  color: rgba(96, 165, 250, 0.08);
  font-size: 6.5rem;
  font-weight: 950;
  line-height: 1;
  pointer-events: none;
}

.about-copy p {
  position: relative;
  z-index: 1;
}

.about-copy p:first-child {
  border: 1px solid rgba(96, 165, 250, 0.22);
  border-radius: var(--radius-lg);
  background: rgba(8, 11, 20, 0.58);
  color: var(--color-text);
  padding: var(--space-5);
  font-size: var(--font-size-lg);
  font-weight: 750;
  line-height: 1.65;
}

.about-copy p + p {
  margin-top: var(--space-5);
}

.about-details {
  display: grid;
  gap: var(--space-4);
  counter-reset: about-detail;
}

.detail-card {
  position: relative;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  column-gap: var(--space-4);
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: rgba(17, 24, 39, 0.94);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium), border-color var(--transition-medium);
}

.detail-card:hover {
  transform: translateY(-4px);
  border-color: rgba(96, 165, 250, 0.4);
  box-shadow: var(--shadow-md);
}

.detail-card::before {
  counter-increment: about-detail;
  content: counter(about-detail, decimal-leading-zero);
  display: grid;
  grid-row: 1 / span 2;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: var(--gradient-action);
  color: #ffffff;
  font-size: var(--font-size-sm);
  font-weight: 950;
  box-shadow: var(--shadow-glow);
}

.detail-card span {
  display: block;
  grid-column: 2;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 800;
}

.detail-card strong {
  display: block;
  grid-column: 2;
  margin-top: var(--space-2);
  color: var(--color-text);
  font-size: var(--font-size-lg);
  line-height: 1.35;
}

/* 7. Skills Section */
.skills-grid {
  display: flex;
  gap: var(--space-5);
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.15rem 0.15rem var(--space-5);
  scroll-padding-inline: 0.15rem;
  scroll-snap-type: x mandatory;
  scrollbar-color: rgba(96, 165, 250, 0.8) rgba(39, 52, 73, 0.8);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.skills-grid::-webkit-scrollbar,
.projects-grid::-webkit-scrollbar {
  height: 10px;
}

.skills-grid::-webkit-scrollbar-track,
.projects-grid::-webkit-scrollbar-track {
  border-radius: 999px;
  background: rgba(39, 52, 73, 0.8);
}

.skills-grid::-webkit-scrollbar-thumb,
.projects-grid::-webkit-scrollbar-thumb {
  border: 2px solid rgba(39, 52, 73, 0.8);
  border-radius: 999px;
  background: var(--gradient-accent);
}

.skill-card {
  flex: 0 0 clamp(290px, 31%, 365px);
  scroll-snap-align: start;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium), border-color var(--transition-medium);
}

.skill-card:hover {
  transform: translateY(-6px);
  border-color: rgba(96, 165, 250, 0.4);
  box-shadow: var(--shadow-md);
}

.skill-card h3 {
  min-height: 3.2rem;
  color: var(--color-text);
  font-size: var(--font-size-lg);
  line-height: 1.3;
}

.skill-card ul {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.skill-card li {
  position: relative;
  padding-left: var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.skill-card li::before {
  content: "";
  position: absolute;
  top: 0.7rem;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
}

/* 8. Projects Section */
.projects-grid {
  display: flex;
  gap: var(--space-6);
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.15rem 0.15rem var(--space-5);
  scroll-padding-inline: 0.15rem;
  scroll-snap-type: x mandatory;
  scrollbar-color: rgba(96, 165, 250, 0.8) rgba(39, 52, 73, 0.8);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.project-card {
  flex: 0 0 clamp(330px, 48%, 560px);
  scroll-snap-align: start;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium), border-color var(--transition-medium);
}

.project-card:hover {
  transform: translateY(-7px);
  border-color: rgba(96, 165, 250, 0.4);
  box-shadow: var(--shadow-md);
}

.project-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border);
}

.project-content {
  padding: var(--space-6);
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.project-type,
.project-status {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  font-size: var(--font-size-xs);
  font-weight: 900;
  line-height: 1.2;
}

.project-type {
  background: rgba(96, 165, 250, 0.14);
  color: #bfdbfe;
}

.project-status {
  background: rgba(52, 211, 153, 0.13);
  color: #86efac;
}

.project-card h3 {
  color: var(--color-text);
  font-size: var(--font-size-xl);
  line-height: 1.25;
}

.project-card p {
  margin-top: var(--space-3);
  color: var(--color-text-secondary);
}

.project-card h4 {
  margin-top: var(--space-5);
  color: var(--color-text);
  font-size: var(--font-size-base);
}

.feature-list {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.feature-list li {
  position: relative;
  padding-left: var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.feature-list li::before {
  content: "";
  position: absolute;
  top: 0.72rem;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-primary);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

/* 9. GitHub Section */
.github-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: var(--space-5);
}

.github-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium), border-color var(--transition-medium);
}

.github-card:hover {
  transform: translateY(-6px);
  border-color: rgba(96, 165, 250, 0.4);
  box-shadow: var(--shadow-md);
}

.github-card-main {
  background:
    linear-gradient(135deg, rgba(96, 165, 250, 0.14), rgba(167, 139, 250, 0.12)),
    var(--color-surface);
  color: var(--color-text);
}

.github-card-main p {
  color: var(--color-text-secondary);
}

.github-card-main .btn-primary {
  border: 0;
  background: var(--gradient-action);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.github-profile-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
}

.github-mark {
  position: relative;
  flex: 0 0 44px;
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(96, 165, 250, 0.14);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 950;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.github-mark:hover,
.github-mark:focus,
.github-mark:focus-visible {
  background: var(--gradient-action);
  color: #ffffff;
  transform: translateY(-2px);
}

.github-mark svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.github-card-main .github-mark {
  background: rgba(96, 165, 250, 0.14);
  color: var(--color-primary);
}

.github-card-main .github-mark:hover,
.github-card-main .github-mark:focus,
.github-card-main .github-mark:focus-visible {
  background: var(--gradient-action);
  color: #ffffff;
}

.github-tooltip {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  z-index: 3;
  border-radius: 999px;
  background: var(--color-tooltip);
  color: #ffffff;
  padding: 0.4rem 0.7rem;
  font-size: var(--font-size-xs);
  font-weight: 900;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 6px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.github-card-main .github-tooltip {
  background: var(--color-tooltip);
  color: #ffffff;
}

.github-tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  width: 8px;
  height: 8px;
  background: var(--color-tooltip);
  transform: translate(-50%, -4px) rotate(45deg);
}

.github-card-main .github-tooltip::after {
  background: var(--color-tooltip);
}

.github-mark:hover .github-tooltip,
.github-mark:focus .github-tooltip,
.github-mark:focus-visible .github-tooltip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.github-card p {
  margin: 0;
  color: var(--color-text-secondary);
  font-weight: 800;
  word-break: break-word;
}

.github-card.github-card-main p {
  color: var(--color-text-secondary);
}

.github-card > .btn,
.github-card > .text-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  margin-top: 0;
}

/* 10. Resume Section */
.resume-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) auto;
  align-items: center;
  gap: var(--space-8);
  border: 1px solid rgba(96, 165, 250, 0.24);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(96, 165, 250, 0.12), rgba(167, 139, 250, 0.1)),
    var(--color-surface);
  padding: var(--space-10);
  box-shadow: var(--shadow-sm);
}

.resume-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* 11. Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
}

.contact-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium), border-color var(--transition-medium);
}

.contact-card:hover {
  transform: translateY(-6px);
  border-color: rgba(96, 165, 250, 0.4);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(96, 165, 250, 0.14);
  color: var(--color-primary);
  font-weight: 950;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.contact-icon:hover,
.contact-icon:focus,
.contact-icon:focus-visible {
  background: var(--gradient-action);
  color: #ffffff;
  transform: translateY(-2px);
}

.contact-icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.contact-icon .github-icon {
  fill: currentColor;
  stroke: none;
}

.contact-tooltip {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  z-index: 3;
  border-radius: 999px;
  background: var(--color-tooltip);
  color: #ffffff;
  padding: 0.4rem 0.7rem;
  font-size: var(--font-size-xs);
  font-weight: 900;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 6px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.contact-tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  width: 8px;
  height: 8px;
  background: var(--color-tooltip);
  transform: translate(-50%, -4px) rotate(45deg);
}

.contact-icon:hover .contact-tooltip,
.contact-icon:focus .contact-tooltip,
.contact-icon:focus-visible .contact-tooltip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.contact-card a {
  display: inline-block;
  color: var(--color-text-secondary);
  font-weight: 700;
  word-break: break-word;
  transition: color var(--transition-fast);
}

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

/* 12. Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: #080b14;
  padding: var(--space-6) 0;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  color: var(--color-text-secondary);
}

.scroll-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 999px;
  background: var(--gradient-action);
  color: #ffffff;
  font-size: var(--font-size-lg);
  font-weight: 900;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.scroll-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* 13. Animations */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 620ms ease, transform 620ms ease;
}

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

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

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* 14. Responsive Design */
@media (max-width: 1100px) {
  :root {
    --font-size-hero: 3.1rem;
  }

  .nav-menu {
    gap: var(--space-3);
  }

  .nav-link {
    padding-inline: 0.56rem;
  }

  .hero-grid,
  .about-layout {
    grid-template-columns: 1fr;
  }

  .hero-card {
    max-width: 520px;
  }

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

  .github-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .github-card-main {
    grid-column: auto;
  }
}

@media (max-width: 860px) {
  :root {
    --font-size-hero: 2.7rem;
    --font-size-2xl: 1.75rem;
  }

  body.menu-open {
    overflow: hidden;
  }

  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    right: 1rem;
    left: 1rem;
    display: grid;
    gap: var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    background: rgba(15, 23, 42, 0.98);
    padding: var(--space-5);
    box-shadow: var(--shadow-md);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
  }

  .nav-menu.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-list {
    display: grid;
    gap: var(--space-2);
  }

  .nav-link {
    width: 100%;
    justify-content: center;
  }

  .language-switch {
    justify-self: center;
  }

  .hero {
    padding: 5.5rem 0 3.5rem;
  }

  .hero-grid {
    gap: var(--space-8);
  }

  .hero-highlights {
    grid-template-columns: 1fr;
  }

  .projects-grid,
  .github-grid,
  .resume-layout {
    grid-template-columns: 1fr;
  }

  .resume-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  :root {
    --font-size-hero: 2.2rem;
    --font-size-xl: 1.18rem;
    --font-size-lg: 1.02rem;
  }

  .container {
    width: min(100% - 1.25rem, var(--container-width));
  }

  .section {
    padding: 3.5rem 0;
  }

  .hero {
    padding: 4.75rem 0 3rem;
  }

  .hero-actions,
  .resume-actions {
    display: grid;
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .hero-card,
  .skill-card,
  .project-card,
  .github-card,
  .contact-card,
  .resume-layout,
  .detail-card {
    border-radius: var(--radius-lg);
  }

  .project-content,
  .skill-card,
  .github-card,
  .contact-card,
  .resume-layout {
    padding: var(--space-5);
  }

  .skill-card {
    flex-basis: min(330px, 84vw);
  }

  .project-card {
    flex-basis: min(330px, 84vw);
  }

  .skills-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

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

  .scroll-top {
    right: 1rem;
    bottom: 1rem;
  }
}