/* ========================================
   MINDPLANE Portfolio - Main Styles
   Motion over decoration, clarity over complexity
   ======================================== */

/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 600;
}

h1 {
  font-size: var(--font-size-hero);
}

h2 {
  font-size: var(--font-size-heading);
  margin-bottom: var(--spacing-medium);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

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

/* ===== NAVIGATION BAR ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition);
  transform: translateY(0);
}

.navbar.hidden {
  transform: translateY(-100%);
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem var(--spacing-small);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  transition: var(--transition);
}

.nav-logo:hover {
  transform: scale(1.05);
}

.logo-text {
  background: linear-gradient(135deg, var(--accent-dark) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-dark);
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger {
  width: 25px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition);
}

.nav-toggle.active .hamburger:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

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

.nav-toggle.active .hamburger:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ===== LOADER ===== */
#loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-loader);
}

.loader-content {
  text-align: center;
}

.loader-text {
  font-size: var(--font-size-hero);
  font-weight: 600;
  display: flex;
  gap: 1rem;
}

.loader-text .word {
  opacity: 0;
  display: inline-block;
}

/* ===== HERO SECTION ===== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-section) var(--spacing-medium);
  padding-top: calc(var(--spacing-section) + 80px); /* Account for navbar */
}

.hero-content {
  max-width: 800px;
}

#hero h1 {
  margin-bottom: 1rem;
  opacity: 0;
}

#hero h2 {
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  opacity: 0;
}

.subtitle {
  font-size: var(--font-size-small);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  opacity: 0;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
}

.btn {
  padding: 1rem 2rem;
  border-radius: var(--radius);
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: var(--font-size-body);
  display: inline-block;
}

.btn-primary {
  background-color: var(--accent-dark);
  color: var(--bg-primary);
}

.btn-primary:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--accent-dark);
  transform: scale(1.02);
}

/* ===== SECTIONS ===== */
section {
  padding: var(--spacing-section) var(--spacing-medium);
}

[data-scroll] {
  opacity: 0;
  transform: translateY(50px);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-small);
}

/* ===== ABOUT SECTION ===== */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-image {
  position: relative;
}

.image-placeholder {
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--border-color) 0%, var(--shadow-subtle) 100%);
  border-radius: var(--radius-large);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-content h2 {
  margin-bottom: var(--spacing-small);
}

.about-content p {
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

/* ===== SKILLS SECTION ===== */
#skills {
  background-color: rgba(0, 0, 0, 0.02);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  margin-top: var(--spacing-medium);
}

.skill-item {
  padding: 2rem 1.5rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
  cursor: default;
}

.skill-item:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-dark);
}

.skill-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.skill-item h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ===== PROJECTS SECTION ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: var(--spacing-medium);
}

.project-card {
  padding: 2rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-large);
  transition: var(--transition);
  cursor: pointer;
}

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

.project-card h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.project-card p {
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.tech-stack {
  font-size: var(--font-size-small);
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.project-link {
  color: var(--accent-dark);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.project-link:hover {
  transform: translateX(4px);
}

/* ===== EXPERIENCE SECTION ===== */
#experience {
  background-color: rgba(0, 0, 0, 0.02);
}

.timeline {
  position: relative;
  padding-left: 3rem;
  margin-top: var(--spacing-medium);
}

.timeline-line {
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 0%;
  background-color: var(--accent-dark);
  transition: height 1s var(--ease-smooth);
}

.timeline-entry {
  position: relative;
  margin-bottom: 3rem;
  padding-left: 2rem;
}

.timeline-dot {
  position: absolute;
  left: -3.5rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  background-color: var(--accent-dark);
  border-radius: 50%;
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--accent-dark);
}

.timeline-year {
  display: inline-block;
  font-size: var(--font-size-small);
  font-weight: 600;
  color: var(--accent-dark);
  margin-bottom: 0.5rem;
}

.timeline-content h3 {
  margin-bottom: 0.25rem;
}

.timeline-content h4 {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.timeline-content p {
  line-height: 1.7;
}

/* ===== CONTACT SECTION ===== */
#contact-form {
  max-width: 600px;
  margin: var(--spacing-medium) auto 0;
}

.form-group {
  margin-bottom: 1.5rem;
}

#contact-form input,
#contact-form textarea {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: var(--transition);
}

#contact-form input:focus,
#contact-form textarea:focus {
  outline: none;
  border-color: var(--accent-dark);
  transform: scale(1.01);
  box-shadow: var(--shadow-sm);
}

#contact-form textarea {
  resize: vertical;
  min-height: 150px;
}

.btn-submit {
  width: 100%;
  cursor: pointer;
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 2rem var(--spacing-medium);
  border-top: 1px solid var(--border-color);
  position: relative;
}

footer p {
  color: var(--text-secondary);
  font-size: var(--font-size-small);
}

.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background-color: var(--accent-dark);
  color: var(--bg-primary);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.scroll-top.visible {
  opacity: 1;
  pointer-events: all;
}

.scroll-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ===== UTILITIES ===== */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

/* ===== MEDIA QUERIES ===== */

/* Tablet */
@media (max-width: 768px) {
  /* Navbar mobile */
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: calc(100vh - 70px);
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem;
    gap: 1.5rem;
    transition: var(--transition);
    border-left: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-link {
    font-size: 1.125rem;
    width: 100%;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-image {
    order: -1;
  }

  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .timeline {
    padding-left: 2rem;
  }

  .timeline-dot {
    left: -2.5rem;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }
}

/* Mobile */
@media (max-width: 480px) {
  :root {
    --spacing-section: 3rem;
  }

  #hero {
    min-height: 90vh;
  }

  .loader-text {
    flex-direction: column;
    gap: 0.5rem;
  }

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

  .skill-item {
    padding: 1.5rem 1rem;
  }

  .timeline-entry {
    padding-left: 1rem;
  }

  .scroll-top {
    width: 45px;
    height: 45px;
    bottom: 1.5rem;
    right: 1.5rem;
  }
}

/* Wide screens */
@media (min-width: 1440px) {
  .container {
    max-width: 1400px;
  }
}

/* Hide scrollbar */
::-webkit-scrollbar {
  display: none;
}

html {
  scrollbar-width: none;
}