/* =========================
   DESIGN SYSTEM
========================= */

:root {
  --bg: #fafafa;
  --text: #0f0f0f;
  --muted: #6b6b6b;
  --border: #eaeaea;
  --card: #ffffff;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --space-7: 140px;

  --radius: 24px;

  --shadow: 0 10px 30px rgba(0, 0, 0, 0.06);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

/* NAV */

nav {
  position: sticky;
  top: 0;
  backdrop-filter: blur(20px);
  background: rgba(250, 250, 250, 0.7);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.nav-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo a {
  font-weight: 600;
  text-decoration: none;
  color: var(--text);
}

.links a {
  margin-left: 24px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

.links a:hover {
  color: var(--text);
}

/* HERO */

.hero {
  padding: 140px 0 100px;
}

.hero-small {
  padding: 80px 0 40px;
}

.kicker {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 24px;
}

h1 {
  font-size: 84px;
  line-height: 0.95;
  letter-spacing: -3px;
  max-width: 900px;
}

.sub {
  margin-top: 24px;
  max-width: 640px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.cta {
  margin-top: 40px;
  display: inline-block;
  padding: 14px 22px;
  border: 1px solid var(--text);
  border-radius: 999px;
  text-decoration: none;
  color: var(--text);
  transition: 0.4s var(--ease);
}

.cta:hover {
  background: var(--text);
  color: white;
  transform: translateY(-2px);
}

/* SECTION */

.section {
  padding: 120px 0;
}

.title {
  font-size: 14px;
  letter-spacing: 2px;
  color: var(--muted);
  margin-bottom: 60px;
  text-transform: uppercase;
}

/* PROJECTS */

.grid {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.card {
  transition: 0.5s var(--ease);
}

.thumb {
  height: 520px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #f3f3f3, #e9e9e9);
  box-shadow: var(--shadow);
  transition: 0.6s var(--ease);
}

.card:hover .thumb {
  transform: translateY(-6px);
}

.card h3 {
  margin-top: 24px;
  font-size: 28px;
}

.card p {
  margin-top: 8px;
  color: var(--muted);
  max-width: 640px;
  line-height: 1.6;
}

.tags {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tag {
  font-size: 12px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
}

/* APPROACH */

.approach {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.approach div {
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.approach h4 {
  font-size: 20px;
  margin-bottom: 10px;
}

.approach p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

/* FOOTER */

footer {
  padding: 80px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

/* RESPONSIVE */

@media (max-width: 900px) {
  h1 {
    font-size: 54px;
  }

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

  .thumb {
    height: 360px;
  }

  .hero {
    padding: 80px 0 60px;
  }

  .section {
    padding: 60px 0;
  }
}

@media (max-width: 600px) {
  h1 {
    font-size: 40px;
    letter-spacing: -2px;
  }

  .nav-inner {
    flex-direction: column;
    height: auto;
    padding: 16px 0;
    gap: 12px;
  }

  .links a {
    margin-left: 0;
    margin: 0 12px;
  }

  .thumb {
    height: 260px;
  }

  .card h3 {
    font-size: 24px;
  }
}

/* ==================== APPROACH GRID ==================== */

.approach-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.approach-card {
  padding: 32px 24px;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: 0.4s var(--ease);
}

.approach-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.approach-icon {
  font-size: 40px;
  margin-bottom: 20px;
}

.approach-card h4 {
  font-size: 22px;
  margin-bottom: 12px;
}

.approach-card p {
  color: var(--muted);
  line-height: 1.6;
  font-size: 15px;
}

/* ==================== TESTIMONIALS ==================== */

.testimonial-section {
  background: #f5f5f5;
  border-radius: var(--radius);
  margin: 40px 0;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.testimonial-card {
  background: var(--card);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: 0.4s var(--ease);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.quote {
  font-size: 64px;
  line-height: 1;
  color: var(--muted);
  margin-bottom: 16px;
  font-family: Georgia, serif;
}

.testimonial-text {
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 24px;
  font-style: italic;
}

.client-info {
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

.client-info strong {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
}

.client-info span {
  font-size: 13px;
  color: var(--muted);
}

/* ==================== ABOUT SECTION ==================== */

.about-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-stats {
  display: flex;
  gap: 48px;
  margin: 32px 0;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 36px;
  font-weight: 600;
  color: var(--text);
}

.stat-label {
  font-size: 14px;
  color: var(--muted);
  margin-top: 4px;
}

.about-placeholder {
  width: 100%;
  height: 400px;
  background: linear-gradient(135deg, #e8e8e8, #d4d4d4);
  border-radius: var(--radius);
}

/* ==================== FOOTER ENHANCED ==================== */

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--text);
}

/* ==================== RESPONSIVE ==================== */

@media (max-width: 900px) {

  .approach-grid,
  .testimonial-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-wrapper {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-stats {
    gap: 32px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
}

@media (max-width: 600px) {
  .approach-card {
    padding: 24px;
  }

  .testimonial-card {
    padding: 24px;
  }

  .stat-number {
    font-size: 28px;
  }

  .about-placeholder {
    height: 280px;
  }
}

/* ==================== ABOUT PAGE ==================== */

.about-page-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-page-image {
  position: sticky;
  top: 100px;
}

.about-page-placeholder {
  width: 100%;
  height: 500px;
  background: linear-gradient(135deg, #e8e8e8, #d4d4d4);
  border-radius: var(--radius);
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%236b6b6b"><path d="M12 12c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm0 2c-2.67 0-8 1.34-8 4v2h16v-2c0-2.66-5.33-4-8-4z"/></svg>');
  background-repeat: no-repeat;
  background-position: center;
  background-size: 80px;
}

.about-page-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin: 40px 0 20px;
}

.about-page-stats .stat {
  text-align: left;
}

/* ==================== SKILLS SECTION ==================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.skill-card {
  background: var(--card);
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: 0.4s var(--ease);
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.skill-card h4 {
  font-size: 20px;
  margin-bottom: 12px;
}

.skill-card p {
  color: var(--muted);
  line-height: 1.6;
  font-size: 14px;
}

/* ==================== RESPONSIVE ADDITIONS ==================== */

@media (max-width: 900px) {
  .about-page-wrapper {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-page-image {
    position: static;
  }

  .about-page-placeholder {
    height: 350px;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 600px) {
  .about-page-stats {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .skill-card {
    padding: 20px;
  }
}

/* ==================== EXPERTISE PAGE ==================== */

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.expertise-card {
  background: var(--card);
  padding: 40px 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: 0.4s var(--ease);
}

.expertise-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.expertise-icon {
  font-size: 48px;
  margin-bottom: 24px;
}

.expertise-card h3 {
  font-size: 28px;
  margin-bottom: 16px;
}

.expertise-card p {
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 24px;
  font-size: 15px;
}

.expertise-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.expertise-tools span {
  font-size: 12px;
  padding: 6px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
}

/* ==================== SKILLS CHIPS ==================== */

.skills-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.chip {
  padding: 10px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 14px;
  color: var(--text);
  transition: 0.3s var(--ease);
}

.chip:hover {
  background: var(--text);
  color: white;
  transform: translateY(-2px);
}

/* ==================== PROCESS STEPS ==================== */

.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
  text-align: center;
}

.step {
  padding: 24px;
}

.step-number {
  font-size: 48px;
  font-weight: 600;
  color: var(--muted);
  opacity: 0.5;
  margin-bottom: 16px;
  font-family: monospace;
}

.step h4 {
  font-size: 18px;
  margin-bottom: 12px;
}

.step p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

/* ==================== RESPONSIVE ==================== */

@media (max-width: 900px) {
  .expertise-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .process-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 600px) {
  .expertise-card {
    padding: 28px 20px;
  }

  .expertise-card h3 {
    font-size: 24px;
  }

  .process-steps {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .step-number {
    font-size: 36px;
  }

  .skills-chips {
    gap: 10px;
  }

  .chip {
    padding: 6px 16px;
    font-size: 12px;
  }
}

/* ==================== DARK MODE ==================== */

/* ==================== DARK MODE ==================== */

[data-theme="dark"] {
  --bg: #0f0f0f;
  --text: #fafafa;
  --muted: #a0a0a0;
  --border: #2a2a2a;
  --card: #1a1a1a;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] nav {
  background: rgba(15, 15, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom-color: #2a2a2a;
}

[data-theme="dark"] .thumb {
  background: linear-gradient(135deg, #2a2a2a, #1a1a1a);
}

[data-theme="dark"] .case-image {
  background: linear-gradient(135deg, #2a2a2a, #1a1a1a);
}

[data-theme="dark"] .testimonial-section {
  background: #141414;
}

[data-theme="dark"] .newsletter,
[data-theme="dark"] .toc,
[data-theme="dark"] .author-box {
  background: #1a1a1a;
}

[data-theme="dark"] .skills-chips .chip {
  background: #1a1a1a;
}

[data-theme="dark"] .skills-chips .chip:hover {
  background: var(--text);
  color: var(--bg);
}

[data-theme="dark"] .filter-btn {
  background: transparent;
  color: var(--muted);
}

[data-theme="dark"] .filter-btn:hover,
[data-theme="dark"] .filter-btn.active {
  background: var(--text);
  color: var(--bg);
}

[data-theme="dark"] .newsletter-input {
  background: #2a2a2a;
  border-color: #3a3a3a;
  color: white;
}

[data-theme="dark"] .approach-card,
[data-theme="dark"] .expertise-card,
[data-theme="dark"] .testimonial-card,
[data-theme="dark"] .stat-big,
[data-theme="dark"] .metadata-grid,
[data-theme="dark"] .persona-card,
[data-theme="dark"] .related-card {
  background: #1a1a1a;
  border-color: #2a2a2a;
}

[data-theme="dark"] .journey-table th {
  background: #1a1a1a;
}

[data-theme="dark"] .journey-table td,
[data-theme="dark"] .journey-table th {
  border-color: #2a2a2a;
}

/* دکمه تغییر تم */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
  transition: 0.3s;
  margin-left: 16px;
}

.theme-toggle:hover {
  background: var(--text);
  color: var(--bg);
}

@media (max-width: 600px) {
  .theme-toggle {
    margin-left: 0;
    margin-top: 8px;
  }
}
/* ==================== SKELETON LOADER ==================== */

.skeleton {
  background: linear-gradient(90deg, #e0e0e0 25%, #f0f0f0 50%, #e0e0e0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius);
}

[data-theme="dark"] .skeleton {
  background: linear-gradient(90deg, #2a2a2a 25%, #3a3a3a 50%, #2a2a2a 75%);
  background-size: 200% 100%;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-thumb {
  height: 520px;
  width: 100%;
}

.skeleton-title {
  height: 32px;
  width: 70%;
  margin-top: 24px;
}

.skeleton-text {
  height: 16px;
  width: 90%;
  margin-top: 12px;
}

.skeleton-tag {
  height: 28px;
  width: 60px;
  border-radius: 999px;
  margin-top: 16px;
}

.loaded .skeleton {
  display: none;
}

/* ==================== SCROLL ANIMATIONS (No Library) ==================== */

/* حالت اولیه - مخفی */
.scroll-animate {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 4s cubic-bezier(0.22, 1, 0.36, 1), transform 5s cubic-bezier(0.22, 1, 0.36, 1);
}

/* حالت نمایان - وقتی عنصر دیده شد */
.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* انواع مختلف انیمیشن‌ها */
.scroll-animate-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.scroll-animate-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.scroll-animate-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.scroll-animate-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scroll-animate-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1), transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.scroll-animate-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* دلی‌های مختلف */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }