/* ===============
   ROOT VARIABLES
   =============== */
:root {
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray: #E0E0E0;
  --color-light-gray: #F8F8F8;
  --font-primary: 'Montserrat', sans-serif;
  --font-heading: 'Helvetica', Arial, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-bold: 700;
  --spacing-small: 8px;
  --spacing-medium: 16px;
  --spacing-large: 32px;
  --spacing-xlarge: 60px;
  --border-radius: 12px;
  --transition: 0.3s ease;
}

/* ===============
   RESET & TYPOGRAPHY
   =============== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--color-white);
  color: var(--color-black);
  font-family: var(--font-primary);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  opacity: 1;
  transition: opacity 0.6s ease;
}

body.fade-out {
  opacity: 0;
}

/* Headings */
.heading,
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-normal);
  letter-spacing: 0.5px;
}

.bold {
  font-weight: var(--font-weight-bold);
}

/* ===============
   HEADER
   =============== */
header {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-medium) 5%;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(5px);
    transition: background var(--transition-fast);
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: var(--spacing-medium);
}

.logo .heading {
    font-size: clamp(12px, 2.5vw, 14px);
    text-align: center;
    line-height: 1.3;
}

.logo-divider {
    width: 100%;
    height: 1px;
    background-color: var(--color-black);
    margin: var(--spacing-small) 0;
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
    gap: var(--spacing-small);
}

nav li {
    margin: 0;
}

nav a {
    text-decoration: none;
    color: var(--color-black);
    font-family: var(--font-heading);
    font-weight: var(--font-weight-normal);
    font-size: clamp(11px, 2.5vw, 14px);
    padding: var(--spacing-small) var(--spacing-medium);
    border-radius: var(--border-radius-small);
    transition: all var(--transition-fast);
    position: relative;
}

nav a:hover,
nav a:focus {
    background-color: var(--color-light-gray);
    transform: translateY(-1px);
}

nav a.active {
    background-color: var(--color-black);
    color: var(--color-white);
}
/* ===============
   PROJECTS SECTION
   =============== */
.projects-section {
  padding: var(--spacing-large) 5%;
}

.section-heading {
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-bottom: var(--spacing-medium);
}

.section-subtitle {
  text-align: center;
  font-size: 1.1rem;
  color: #666;
  margin-bottom: var(--spacing-xlarge);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.project-category {
  margin-bottom: var(--spacing-xlarge);
}

.category-title {
  font-size: 1.6rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-large);
  padding-bottom: var(--spacing-small);
  border-bottom: 2px solid var(--color-gray);
  display: inline-block;
}

/* Project Grid */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-large);
}

.project-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--border-radius);
  padding: var(--spacing-large);
  transition: transform var(--transition), box-shadow var(--transition);
}

@media (hover: hover) {
  .project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.08);
  }
}

.project-name {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  font-size: 1.2rem;
  margin: 0 0 var(--spacing-small) 0;
  color: var(--color-black);
}

.project-developer {
  font-size: 0.95rem;
  color: #555;
  margin: 0 0 var(--spacing-small) 0;
}

.project-scale,
.project-note {
  font-size: 0.95rem;
  color: #777;
  margin: 0;
}

/* ===============
   RESPONSIVE
   =============== */
@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  header {
    padding: var(--spacing-medium) 5%;
  }

  .mobile-toggle {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }
}

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

  .projects-section {
    padding: var(--spacing-xlarge) 5%;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}