/* ==========================================================================
   Modern Portfolio Design System
   ========================================================================== */

/* Import Fonts */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
  /* Colors - Light Theme */
  --color-primary: #1560BD;
  --color-primary-light: #2D68C4;
  --color-primary-dark: #11509D;
  --color-secondary: #475569;
  --color-accent: #06B6D4;
  --color-background: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;
  --color-text-primary: #0F172A;
  --color-text-secondary: #64748B;
  --color-text-tertiary: #94A3B8;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  --color-success: #10B981;
  --color-error: #EF4444;
  
  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Font Sizes */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */
  
  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* Line Heights */
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;
  
  /* Spacing Scale */
  --space-1: 0.25rem;      /* 4px */
  --space-2: 0.5rem;       /* 8px */
  --space-3: 0.75rem;      /* 12px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.25rem;      /* 20px */
  --space-6: 1.5rem;       /* 24px */
  --space-8: 2rem;         /* 32px */
  --space-10: 2.5rem;      /* 40px */
  --space-12: 3rem;        /* 48px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */
  --space-32: 8rem;        /* 128px */
  
  /* Section Spacing - Responsive */
  --section-padding-y: clamp(3rem, 8vw, 5rem);
  --section-padding-x: clamp(1rem, 4vw, 1.5rem);
  --section-gap: clamp(2rem, 5vw, 4rem);
  
  /* Border Radius */
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index Scale */
  --z-base: 1;
  --z-dropdown: 10;
  --z-sticky: 100;
  --z-fixed: 1000;
  --z-modal: 10000;
  
  /* Layout */
  --max-width: 1280px;
  --nav-height: 4rem;
}

/* Dark Theme */
body.dark {
  --color-background: #0F172A;
  --color-surface: #1E293B;
  --color-surface-elevated: #334155;
  --color-text-primary: #F1F5F9;
  --color-text-secondary: #94A3B8;
  --color-text-tertiary: #64748B;
  --color-border: #334155;
  --color-border-light: #475569;
}

/* ==========================================================================
   Base Styles & Reset
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: clamp(var(--text-4xl), 5vw, var(--text-6xl));
  margin-bottom: var(--space-6);
}

h2 {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  margin-bottom: var(--space-5);
}

h3 {
  font-size: clamp(var(--text-2xl), 3vw, var(--text-3xl));
  margin-bottom: var(--space-4);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

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

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

/* ==========================================================================
   Navigation
   ========================================================================== */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

body.dark nav {
  background: rgba(15, 23, 42, 0.8);
  border-bottom-color: var(--color-border);
}

nav ul {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

nav ul a {
  color: var(--color-text-secondary);
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

nav ul a:hover {
  color: var(--color-primary);
  background: var(--color-border-light);
}

body.dark nav ul a:hover {
  background: var(--color-surface);
}

nav ul a.active {
  color: var(--color-primary);
  font-weight: var(--font-semibold);
}

/* Theme Toggle Button */
#theme-toggle {
  position: fixed;
  top: 0.875rem;
  right: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-size: var(--text-lg);
  cursor: pointer;
  z-index: calc(var(--z-fixed) + 1);
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

#theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

#theme-toggle:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

#theme-toggle i {
  pointer-events: none;
  display: block;
}

/* ==========================================================================
   Section Base Styles
   ========================================================================== */

section {
  padding: var(--section-padding-y) var(--section-padding-x);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: var(--section-gap);
}

.section-title span {
  color: var(--color-primary);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.home {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-surface) 100%);
  overflow: hidden;
}

/* Animated background gradient */
.home::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(21, 96, 189, 0.1) 0%, transparent 70%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(120deg); }
  66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.home .main {
  padding-top: calc(var(--nav-height) + var(--space-12));
  text-align: center;
  position: relative;
  z-index: var(--z-base);
  max-width: 900px;
  margin: 0 auto;
}

.home .main img {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-full);
  object-fit: cover;
  margin: 0 auto var(--space-8);
  border: 4px solid var(--color-surface);
  box-shadow: var(--shadow-xl);
  transition: transform var(--transition-base);
}

.home .main img:hover {
  transform: scale(1.05);
}

.home .description h1 {
  font-size: clamp(var(--text-4xl), 6vw, var(--text-6xl));
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.home .description h2 {
  font-size: clamp(var(--text-lg), 2.5vw, var(--text-2xl));
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
  line-height: var(--leading-relaxed);
}

.home .description > p {
  font-size: var(--text-lg);
  color: var(--color-text-tertiary);
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

/* Buttons */
.btn {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.btn button,
button.btn {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn button:first-child {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn button:first-child:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn button:last-child {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn button:last-child:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.btn button a {
  color: inherit;
  display: block;
}

/* Social Links */
.social-links {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-8);
}

.social-links a {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
  color: var(--color-text-secondary);
  font-size: var(--text-xl);
}

.social-links a:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

/* ==========================================================================
   About Section
   ========================================================================== */

.about {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  padding: var(--section-padding-y) var(--section-padding-x);
  margin: var(--section-gap) auto;
  max-width: var(--max-width);
  box-shadow: var(--shadow-sm);
}

.about h1 {
  text-align: center;
  margin-bottom: var(--section-gap);
}

.about .description {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
}

@media (min-width: 768px) {
  .about .description {
    grid-template-columns: 2fr 1fr;
  }
}

.about .description .left .top {
  margin-bottom: var(--space-8);
}

.about .description .left .top p {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

.about .description .left .top li {
  margin-left: var(--space-6);
  margin-bottom: var(--space-2);
  color: var(--color-text-secondary);
}

.about .description .left .bottom {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.about .description .left .bottom > div {
  background: var(--color-background);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  text-align: center;
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.about .description .left .bottom > div:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.about .description .left .bottom span {
  display: block;
  font-size: var(--text-5xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  font-family: var(--font-heading);
  margin-bottom: var(--space-2);
}

.about .description .left .bottom p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

.about .description .right {
  background: var(--color-background);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  height: fit-content;
}

.about .description .right h3 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-6);
  color: var(--color-primary);
}

.about .description .right > div {
  display: flex;
  justify-content: space-between;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.about .description .right > div:last-child {
  border-bottom: none;
}

.about .description .right > div p:first-child {
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.about .description .right > div p:last-child {
  color: var(--color-text-secondary);
  margin: 0;
}

.about .description .right > div span {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-success);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
}

/* ==========================================================================
   Skills Section
   ========================================================================== */

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

.skills h1 {
  text-align: center;
  margin-bottom: var(--section-gap);
}

.skill {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: var(--section-gap);
}

.skill > div {
  background: var(--color-surface);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  text-align: center;
}

.skill > div:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.skill .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-6);
  background: var(--color-background);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-border);
  transition: all var(--transition-fast);
}

.skill > div:hover .icon {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: scale(1.1);
}

.skill .icon img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  transition: all var(--transition-fast);
}

/* Light theme - dark icons */
body.light .skill .icon img {
  filter: brightness(0) saturate(100%) invert(15%) sepia(8%) saturate(1084%) hue-rotate(180deg) brightness(95%) contrast(93%);
}

/* Dark theme - light icons */
body.dark .skill .icon img {
  filter: brightness(0) invert(1);
}

/* On hover - always white icons */
.skill > div:hover .icon img {
  filter: brightness(0) invert(1);
}

.skill h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.skill p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

/* Projects Section */
.projects {
  margin-top: var(--section-gap);
}

.projects .sample {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.projects .sample > div {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.projects .sample > div:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl);
}

.projects .sample img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
}

.projects .sample > div > div {
  padding: var(--space-6);
}

.projects .sample h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.projects .sample p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  line-height: var(--leading-relaxed);
}

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

.projects .stack button {
  background: var(--color-background);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  cursor: default;
  transition: all var(--transition-fast);
}

.projects .sample > div:hover .stack button {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.projects .sample > div > div > button {
  width: 100%;
  background: var(--color-primary);
  color: white;
  border: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.projects .sample > div > div > button:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.projects .sample > div > div > button a {
  color: white;
  display: block;
}

.projects > button.btn {
  display: block;
  margin: var(--space-12) auto 0;
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  padding: var(--space-4) var(--space-10);
  border-radius: var(--radius-lg);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.projects > button.btn:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.projects > button.btn a {
  color: inherit;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact {
  padding: var(--section-padding-y) var(--section-padding-x);
  text-align: center;
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  margin: var(--section-gap) auto;
  max-width: var(--max-width);
}

.contact h1 {
  font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
  margin-bottom: clamp(1rem, 2vw, 1.5rem);
}

.contact > p {
  font-size: clamp(var(--text-base), 2vw, var(--text-lg));
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--section-gap);
}

.socials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.socials > div {
  background: var(--color-background);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.socials > div:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.socials .icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-border);
  transition: all var(--transition-fast);
}

.socials > div:hover .icon {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: scale(1.1);
}

.socials .icon img {
  width: 28px;
  height: 28px;
  object-fit: contain;
  transition: all var(--transition-fast);
}

/* Light theme - dark icons */
body.light .socials .icon img {
  filter: brightness(0) saturate(100%) invert(15%) sepia(8%) saturate(1084%) hue-rotate(180deg) brightness(95%) contrast(93%);
}

/* Dark theme - light icons */
body.dark .socials .icon img {
  filter: brightness(0) invert(1);
}

/* On hover - always white icons */
.socials > div:hover .icon img {
  filter: brightness(0) invert(1);
}

.socials span {
  display: block;
  font-weight: var(--font-semibold);
  font-size: var(--text-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.socials p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

.contact > button.btn {
  background: var(--color-primary);
  color: white;
  border: none;
  padding: var(--space-4) var(--space-10);
  border-radius: var(--radius-lg);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.contact > button.btn:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   Footer
   ========================================================================== */

footer {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

footer p {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  margin: 0;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 768px) {
  :root {
    --nav-height: 3.5rem;
    --section-padding-y: 3rem;
    --section-padding-x: 1rem;
    --section-gap: 2.5rem;
  }
  
  nav ul {
    gap: var(--space-3);
    padding: 0 var(--space-4);
  }
  
  nav ul a {
    font-size: var(--text-xs);
    padding: var(--space-2) var(--space-3);
  }
  
  #theme-toggle {
    right: var(--space-4);
    padding: var(--space-2);
    font-size: var(--text-base);
  }
  
  .home .main {
    padding-top: calc(var(--nav-height) + var(--space-8));
  }
  
  .home .main img {
    width: 150px;
    height: 150px;
    margin-bottom: var(--space-6);
  }
  
  .btn {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  .btn button {
    width: 100%;
  }
  
  .skill {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .projects .sample {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .socials {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .about .description {
    gap: var(--space-8);
  }
  
  .about .description .left .bottom {
    gap: var(--space-4);
  }
}

@media (max-width: 480px) {
  :root {
    --section-padding-y: 2rem;
    --section-gap: 2rem;
  }
  
  nav ul {
    gap: var(--space-2);
  }
  
  nav ul a {
    padding: var(--space-1) var(--space-2);
  }
  
  .home .main img {
    width: 120px;
    height: 120px;
  }
  
  .about .description .left .bottom {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .skill > div {
    padding: var(--space-6);
  }
  
  .projects .sample > div > div {
    padding: var(--space-5);
  }
}

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

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Accessibility */
.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;
}

/* Focus styles for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}