/* ==========================================================================
   Ratan Madan Singh — Personal Portfolio
   Clean, lean, zero-dependency stylesheet
   ========================================================================== */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Colors - Light Theme (default) */
  --color-bg: #fafafa;
  --color-bg-elevated: #ffffff;
  --color-bg-muted: #f0f0f0;
  --color-text: #1a1a2e;
  --color-text-muted: #6b6b7b;
  --color-text-subtle: #9a9aa3;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-accent: #0ea5e9;
  --color-border: #e5e5e5;
  --color-border-strong: #d4d4d4;
  --color-focus: #2563eb;
  --color-success: #16a34a;
  --color-error: #dc2626;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 28px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.1);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --line-height-tight: 1.1;
  --line-height-snug: 1.375;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.75;

  /* Spacing Scale */
  --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;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Layout */
  --container-max: 1120px;
  --container-padding: 1.5rem;
  --header-height: 64px;

  /* Z-Index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-toast: 600;
}

/* Dark Theme */
[data-theme="dark"] {
  --color-bg: #0f0f1a;
  --color-bg-elevated: #181828;
  --color-bg-muted: #1f1f35;
  --color-text: #f0f0f5;
  --color-text-muted: #a0a0b0;
  --color-text-subtle: #6a6a7a;
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-light: #1e3a5f;
  --color-accent: #22d3ee;
  --color-border: #2d2d44;
  --color-border-strong: #3d3d54;
  --color-focus: #3b82f6;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 28px rgba(0,0,0,0.4);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.5);
}

/* 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-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

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

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

/* ==========================================================================
   Layout Utilities
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

@media (min-width: 768px) {
  .section {
    padding: var(--space-20) 0;
  }
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

@media (min-width: 768px) {
  .section-title {
    font-size: var(--font-size-4xl);
  }
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  font-weight: 400;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border: 1px solid var(--color-primary);
}

.btn--primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}

.btn--secondary:hover:not(:disabled) {
  background: var(--color-bg-muted);
  border-color: var(--color-text-muted);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-loading {
  display: none;
}

.btn:disabled .btn-text {
  display: none;
}

.btn:disabled .btn-loading {
  display: block;
}

/* ==========================================================================
   Links
   ========================================================================== */
.link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.link--primary {
  background: var(--color-primary);
  color: #fff;
}

.link--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.link--secondary {
  background: var(--color-bg-muted);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.link--secondary:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-sm);
}

.link-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ==========================================================================
   Header / Navigation
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-fixed);
  transition: background var(--transition-base), border-color var(--transition-base);
}

[data-theme="dark"] .header {
  background: rgba(15, 15, 26, 0.85);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-menu {
  display: none;
  align-items: center;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }
}

.nav-menu a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-menu a:hover,
.nav-menu a[aria-current="page"] {
  color: var(--color-text);
}

.nav-menu a:hover::after,
.nav-menu a[aria-current="page"]::after {
  width: 100%;
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.hamburger {
  position: relative;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base);
}

.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }

.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg) translate(4px, 4px);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg) translate(4px, -4px);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-border-strong);
}

.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

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

/* Mobile Menu Overlay */
@media (max-width: 767px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-12);
    gap: var(--space-4);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu a {
    font-size: var(--font-size-xl);
    padding: var(--space-3) 0;
  }
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about {
  padding-top: calc(var(--header-height) + var(--space-16));
}

.about-grid {
  display: grid;
  gap: var(--space-10);
  align-items: center;
}

@media (min-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr 320px;
  }
}

.eyebrow {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}

.headline {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .headline {
    font-size: var(--font-size-5xl);
  }
}

.lead {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 560px;
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.about-image {
  display: flex;
  justify-content: center;
}

.image-frame {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--color-border);
  background: var(--color-bg-muted);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (min-width: 768px) {
  .image-frame {
    width: 280px;
    height: 280px;
  }
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   Experience — Clean Company Timeline
   ========================================================================== */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.timeline-company {
  position: relative;
}

.company-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  padding-left: var(--space-6);
}

@media (min-width: 768px) {
  .company-header {
    padding-left: var(--space-8);
  }
}

.company-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 50%;
  padding: var(--space-1);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

[data-theme="dark"] .company-logo {
  background: #ffffff;
}

.company-name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: var(--line-height-tight);
}

.company-period {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

.company-roles {
  position: relative;
  padding-left: var(--space-6);
}

@media (min-width: 768px) {
  .company-roles {
    padding-left: var(--space-8);
  }
}

/* Timeline line */
.company-roles::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

@media (min-width: 768px) {
  .company-roles::before {
    left: 15px;
  }
}

.role {
  padding-left: var(--space-5);
  margin-bottom: var(--space-6);
}

.role:last-child {
  margin-bottom: 0;
}

.role-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
}

@media (min-width: 600px) {
  .role-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-4);
  }
}

.role-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  line-height: var(--line-height-snug);
}

.role-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-subtle);
  white-space: nowrap;
  font-weight: 500;
}

.role-description {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.role-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ==========================================================================
   Portfolio
   ========================================================================== */
.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 600px) {
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .portfolio-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}

.project-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.project-card:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.project-image {
  width: 100%;
  height: 160px;
  overflow: hidden;
  background: var(--color-bg-muted);
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-content {
  padding: var(--space-5);
}

.project-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: var(--line-height-snug);
}

.project-description {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.project-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.project-client {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ==========================================================================
   Tags / Badges (Pill Button Style)
   ========================================================================== */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--font-size-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tag:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Dark mode tag adjustments */
[data-theme="dark"] .tag {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

[data-theme="dark"] .tag:hover {
  background: var(--color-primary);
  color: #fff;
}

/* Role tags - slightly smaller */
.role-tags .tag {
  font-size: var(--font-size-xs);
  padding: var(--space-1) var(--space-2);
}

/* Hidden state for filtering */
.project-card.hidden {
  display: none;
}

/* ==========================================================================
   Contact Form
   ========================================================================== */
.contact-form {
  max-width: 640px;
  margin: 0 auto;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

@media (min-width: 600px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

.form-field {
  margin-bottom: var(--space-4);
}

.form-field label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-field input,
.form-field textarea {
  width: 100%;
  font-family: inherit;
  font-size: var(--font-size-base);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--color-text-subtle);
}

.form-field input:hover,
.form-field textarea:hover {
  border-color: var(--color-border-strong);
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--color-focus);
  box-shadow: 0 0 0 3px var(--color-primary-light);
  outline: none;
}

.form-field textarea {
  resize: vertical;
  min-height: 120px;
}

.form-status {
  margin-top: var(--space-4);
  font-size: var(--font-size-sm);
  text-align: center;
  min-height: 1.5em;
}

.form-status.success {
  color: var(--color-success);
}

.form-status.error {
  color: var(--color-error);
}

/* ==========================================================================
   Education Section
   ========================================================================== */
.education-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 600px) {
  .education-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .education-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.education-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.education-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.education-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.education-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;  /* Always circular */
  background: #ffffff;  /* Always white, not theme-aware */
  padding: var(--space-2);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.education-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.education-degree {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-2);
}

.education-school {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}

.education-period {
  font-size: var(--font-size-xs);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-4);
  font-weight: 500;
}

.education-courses {
  list-style: none;
  padding: 0;
  margin: 0;
}

.education-courses li {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  padding: var(--space-1) 0;
  padding-left: var(--space-4);
  position: relative;
  border-bottom: 1px solid var(--color-border);
}

.education-courses li:last-child {
  border-bottom: none;
}

.education-courses li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-primary);
}

.education-desc {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-subtle);
  text-align: center;
}

/* ==========================================================================
   Scrollbar Styling
   ========================================================================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-subtle);
}

/* ==========================================================================
   Performance Optimizations
   ========================================================================== */

/* Skip rendering off-screen sections until needed */
section {
  content-visibility: auto;
  contain-intrinsic-size: 0 500px;  /* Reserve space to prevent layout shift */
}

/* Reduce paint area for cards */
.project-card,
.education-card,
.role,
.company-info {
  contain: layout style paint;
}

/* Only animate transform/opacity (compositor-only) */
.project-card:hover,
.education-card:hover,
.role:hover {
  will-change: transform, box-shadow;
}

.project-card,
.education-card,
.role {
  will-change: auto;
}

/* Disable hover animations on touch devices (no hover state) */
@media (hover: none) and (pointer: coarse) {
  .project-card:hover,
  .education-card:hover,
  .role:hover,
  .tag:hover,
  .filter-btn:hover,
  .btn:hover,
  .link:hover,
  .nav-menu a:hover {
    transform: none;
    box-shadow: none;
  }
}

/* Reduce motion for users who prefer it */
@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;
  }
}

/* Font display optimization */
@font-face {
  font-family: 'Inter';
  font-display: swap;  /* Show fallback immediately, swap when loaded */
  src: local('Inter');
}