/* ==========================================================================
   COLOR SYSTEM & BASE VARIABLES
   ========================================================================== */
:root {
  /* DARK THEME (Natural Gray Palette) */
  --bg-main: #101214;
  --bg-secondary: #16191D;
  --bg-surface: #1B1F24;
  
  --text-primary: #F1F3F5;
  --text-secondary: #A6ADB7;
  --text-muted: #737B87;
  
  --border-color: #292E35;
  
  --accent: #4F7CFF;
  --accent-hover: #6B92FF;
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-fa: 'Vazirmatn', system-ui, sans-serif;
  
  --max-width: 1140px;
  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* LIGHT THEME (Warm Off-White Palette) */
[data-theme="light"] {
  --bg-main: #F4F3EF;
  --bg-secondary: #ECEBE6;
  --bg-surface: #FAF9F6;
  
  --text-primary: #17191C;
  --text-secondary: #60656D;
  --text-muted: #8C929B;
  
  --border-color: #D9D8D2;
  
  --accent: #315FE8;
  --accent-hover: #214AC4;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Persian typography override when RTL */
[dir="rtl"] body {
  font-family: var(--font-fa);
}

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

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

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding: 6rem 0;
}

/* Scroll Progress */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  width: 0%;
  z-index: 1000;
  transition: width 0.1s linear;
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: transparent;
  transition: background-color 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background-color: var(--bg-main);
  border-bottom-color: var(--border-color);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  letter-spacing: 0.1em;
  font-size: 1.1rem;
}

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

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: var(--transition-smooth);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.btn-text {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

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

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

.btn-nav {
  font-size: 0.85rem;
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  transition: var(--transition-smooth);
}

.btn-nav:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.hamburger span {
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition-smooth);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--accent);
  color: #FFFFFF;
}

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

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

.btn-secondary:hover {
  border-color: var(--text-primary);
}

.btn-link {
  color: var(--accent);
  font-weight: 500;
  font-size: 0.9rem;
}

.btn-link:hover {
  text-decoration: underline;
}

/* Typography Details */
.section-number {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  display: block;
  margin-bottom: 0.5rem;
}

.section-heading {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.accent-text { color: var(--accent); }

/* Hero Section */
.hero-section {
  padding: 7rem 0 5rem 0;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.6rem;
  border-radius: 50px;
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 6px;
  height: 6px;
  background-color: #22c55e;
  border-radius: 50%;
}

.hero-title {
  font-size: 2.75rem;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.hero-title span { display: block; }

.hero-tagline {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  max-width: 500px;
}

.hero-bio {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 480px;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-micro-detail {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

/* Creative Profile Image Design */
.hero-image-wrapper {
  display: flex;
  justify-content: flex-end;
}

.portrait-composition {
  position: relative;
  width: 280px;
  height: 360px;
  cursor: pointer;
}

.portrait-layer-bg {
  position: absolute;
  inset: 12px -12px -12px 12px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  z-index: 1;
  transition: var(--transition-smooth);
}

.portrait-frame {
  position: absolute;
  inset: 0;
  z-index: 2;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%) contrast(105%);
  transition: transform 0.5s ease, filter 0.5s ease;
}

.portrait-composition:hover .portrait-frame img {
  transform: scale(1.04);
  filter: grayscale(80%) contrast(105%);
}

.portrait-composition:hover .portrait-layer-bg {
  transform: translate(-4px, 4px);
  border-color: var(--accent);
}

.portrait-tag {
  position: absolute;
  bottom: -25px;
  left: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
}

.tag-title {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--text-primary);
}

.tag-sub {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.portrait-coords {
  position: absolute;
  top: -20px;
  right: 0;
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  z-index: 3;
}

/* About Section */
.editorial-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 3rem;
}

.editorial-quote {
  font-style: italic;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 1.5rem;
  border-left: 2px solid var(--accent);
  padding-left: 1rem;
}

[dir="rtl"] .editorial-quote {
  border-left: none;
  border-right: 2px solid var(--accent);
  padding-left: 0;
  padding-right: 1rem;
}

.paragraph-lead {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.editorial-col-right p {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

.info-row {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.info-item {
  display: flex;
  flex-direction: column;
}

.info-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.info-value {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.skill-category {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 2rem;
  border-radius: 4px;
}

.category-title {
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  font-weight: 600;
}

.skill-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-pill {
  font-size: 0.85rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.7rem;
  border-radius: 4px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-smooth);
}

.pill-dot {
  width: 4px;
  height: 4px;
  background-color: var(--accent);
  border-radius: 50%;
}

.skill-pill:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* Services Section */
.services-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-color);
}

.service-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.service-item:hover {
  background-color: var(--bg-secondary);
  padding-left: 1rem;
  padding-right: 1rem;
}

.service-index {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
}

.service-details h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.service-details p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 650px;
}

/* Projects Section */
.projects-header-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2.5rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.filter-controls {
  display: flex;
  gap: 0.5rem;
}

.filter-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.filter-btn:hover, .filter-btn.active {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #FFFFFF;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.project-card.large-card {
  grid-column: span 2;
}

.project-card.wide-card {
  grid-column: span 2;
}

.project-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.project-image-box {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--bg-secondary);
}

.project-image-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(16, 18, 20, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-card:hover .project-overlay { opacity: 1; }
.project-card:hover .project-image-box img { transform: scale(1.03); }

.project-meta {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.project-num {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.badge-concept {
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  color: var(--text-muted);
}

.project-title {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.project-tags span {
  font-size: 0.75rem;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
}

/* GitHub Placeholder */
.github-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 2rem;
  border-radius: 4px;
}

.github-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.grid-cells {
  display: grid;
  grid-template-columns: repeat(40, 1fr);
  gap: 4px;
  margin-bottom: 0.75rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.cell {
  width: 100%;
  aspect-ratio: 1;
  background-color: var(--bg-secondary);
  border-radius: 2px;
}

.cell.lvl-1 { background-color: rgba(79, 124, 255, 0.25); }
.cell.lvl-2 { background-color: rgba(79, 124, 255, 0.55); }
.cell.lvl-3 { background-color: var(--accent); }

.placeholder-caption {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Timeline / Journey */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  border-left: 1px solid var(--border-color);
  padding-left: 1.5rem;
  margin-left: 0.5rem;
}

[dir="rtl"] .timeline {
  border-left: none;
  border-right: 1px solid var(--border-color);
  padding-left: 0;
  padding-right: 1.5rem;
  margin-left: 0;
  margin-right: 0.5rem;
}

.timeline-item {
  position: relative;
}

.timeline-marker {
  position: absolute;
  left: -1.85rem;
  top: 0.35rem;
  width: 9px;
  height: 9px;
  background-color: var(--accent);
  border-radius: 50%;
}

[dir="rtl"] .timeline-marker {
  left: auto;
  right: -1.85rem;
}

.timeline-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
}

.timeline-content h3 {
  font-size: 1.1rem;
  margin: 0.2rem 0;
}

.timeline-sub {
  font-size: 0.85rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
}

.timeline-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Values */
.values-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.values-list strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.values-list p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3rem;
}

.contact-heading {
  font-size: 2.25rem;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.contact-sub {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.social-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.social-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  transition: var(--transition-smooth);
}

.social-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 2rem;
  border-radius: 4px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input, .form-group textarea {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.75rem;
  border-radius: 4px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  transition: var(--transition-smooth);
}

.form-group input:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.error-msg {
  font-size: 0.75rem;
  color: #ef4444;
  display: none;
}

.form-group.invalid .error-msg { display: block; }
.form-group.invalid input, .form-group.invalid textarea { border-color: #ef4444; }

.form-status {
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

.form-status.success { color: #22c55e; }

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
}

.modal-container {
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  width: 90%;
  max-width: 650px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2rem;
  border-radius: 4px;
  z-index: 2;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

[dir="rtl"] .modal-close {
  right: auto;
  left: 1rem;
}

.modal-title { font-size: 1.5rem; margin-bottom: 0.25rem; }
.modal-category { font-size: 0.8rem; color: var(--accent); display: block; margin-bottom: 1rem; }
.modal-image-box { margin-bottom: 1rem; border-radius: 4px; overflow: hidden; }
.modal-desc { color: var(--text-secondary); margin-bottom: 1.5rem; font-size: 0.95rem; }

.modal-details-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.modal-details-grid h4 { font-size: 0.9rem; margin-bottom: 0.5rem; }
.modal-features-list { list-style: square; padding-left: 1.2rem; font-size: 0.85rem; color: var(--text-secondary); }
[dir="rtl"] .modal-features-list { padding-left: 0; padding-right: 1.2rem; }

.modal-actions {
  display: flex;
  gap: 1rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}